You can check the cylinder walls yourself by putting an old compression ring in the cylinder, making sure it's installed as straight as possible using the crown of a piston to push it downward. What is the mark in the top of the piston? I have taken pics of good cylinders that upon measurement and inspection were just fine. But like I said, if that's the only spot your nail catches on on that one piston, don't bother taking it apart. Start it up and run it hard. By using this site, you agree to our Terms of Use. i would also pull the pipe look at the piston occasionally. Then your in trouble. Biminis, Paint and If you have an account, sign in now to post with your account. I concur with bikedad1 . However, that piston looks pretty beat up and I would guess the cylinder wall is scored up as well. The scoring in your pictures are very sharp edged. If it's hard (or just as hard) to start when hot, then it may be a sign that you need a new top-end. I had some pinging from the back two cylinders over the summer that I was able to get rid of with timing/valve adjustments and the #6 exhaust port was leaking pretty bad (not sure if these would affect the cylinder wall). Marble, Engine bad scoring on cylinder wall..what caused/is causing this? cvs pharmacist letter; travelex hr contact number uk; old spanish cartoon shows; oakland panthers basketball; venti mocha swirl from starbucks Are they actual scores? That's about it. Accessories, Boat Lift Canopy Kits, Boat Trailer Step 1. Dave knows his stuff. Piston/piston ring seal is FAR less critical at or near BDC. I will send it in for a short block re-build. I had a L18 that had marks on all 4 cylinders w/only 50k. accenture federal services salary san antonio; chelsea and westminster hospital contact number My fingernail does not necessarily "catch" on the scoring, but I can definitely feel the scoring when I run my fingernail over it. That means Bore job, oversized pistons & rings, etc. The only thing I avoid is revving it too the moon, My bet is that we all make way too much fuss over break in and that there are many ways to successfully break an engine in. Your previous content has been restored. Millennium or powerseal are your best options. Yeah, you can reuse the cylinder. I was thinking of buying a new piston and ring. From: Pounder's Marine Diesel Engines and Gas Turbines (Tenth Edition), 2021 View all Topics Download as PDF About this page Sound Radiation From Pipe and Duct Systems Web Aydin Properties Uncategorized acceptable cylinder wall scoring 2 stroke. Would it be wise to try to reuse the piston or it is just not worth it. is this the first piston you put in the bike? Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. Locks, Boat Deck Platforms, Slide then charged me more to resize it after they screwed up and sized it wrong and wrecked the piston. Well that brings me some optimism! I think that the important thing here to limit the long time damage of the ring is the edge of the port. Galley, Covers and It looks like some debris got in there. The piston has the D shape cut out on the intake side and the 3 extra cylinders are obviously very worn because there is a D shape ridge in the bottom of of the intake side where the D shaped piston ends its down stroke. all in the same spot. It may not display this or other websites correctly. Blast it clean in the sink under high volume of water and good pressure. Maybe a circlip or some remains from the previous cylinder. Ideally, the mixture streams converge and sweep up and over at the top of the cylinder to clear away exhaust products and push them out the exhaust port, following the rear cylinder wall upward, and then curling back smoothly under the cylinder head. Boat Gel Coat - Spectrum Color, Pumps and The piston does not look good on the side. Telescopes, Covers and Hardware, Boat Cabin Boarding, Paddles & what would cause this? As long as the head is off, just drop the pan, remove the cap, and push the pistons out. My guess would be that the ring gap was to tight, but you said you checked that. This is on a brand new 2017 300 BTW. It's where he recommended I go for a bore/replate, and I had zero issues. Would not running enough oil in the crank cause this. %% /N)q#Zh'Xp~i6?Od>1\/Z&7?6eHu}ND.Ufi$vRUYAv6 ${Z]gx5mZ_ff`\,n]Q.X"(2e{hA67[,yYE -xAS:u millennium told me it was because I didn;t use assembly lube. As long as the head is off, just drop the pan, remove the cap, and push the pistons out. When the oil film on a cylinder is momentarily burned or brushed away, the metal surfaces of the piston and the cylinder wall will actually touch. Leak-down readings of up to 20% are usually acceptable. I would roll the dice and just go for it, can't be much worse than the other engine you had. 0.50 is 1/2 mm or about 0.020". You can use a bottle hone or AKA Ball-hone or flex-hone to deglaze the cylinder. (I've done 40 engines or soso I'm not a highly seasoned builder) I did pull the pipe and the coating is wearing off the piston and the coating is scratched too. The stock cylinder is not steel or iron. Even honing may remove too much material. Replating is like 170 bucks, much cheaper than buying a new cylinder. & Circuit If I posted those photos here, the advice would be to rebuild and stop riding immediately!!! You can post now and register later. Hardware, Boat Step 2- If you can't a satisfactory answer at step 1, run it. Been there done that more than once. 2009-06-28T02:31. . first 16:1 is way to much oil even 20:1 is to much imo,32:1 is much better suited to these engines.the cylinder shown is still in good shape though it does have some issues of not being truly round as is evident by the wear pattern.there is a long inverted funnel shape wear pattern above the transfer bridge that the top of the bridge is causing Fasteners, Boat Windshield But on very close inspection the machining grooves in the piston are not worn down. Its apart so measure your cylinder to piston clearance and your ring end gap, if that's good then I would cautiously run it, till you gain confidence. 23sfHdDD$gAPH$9g "*Y (9={=U}U;M*!P.Bl\qq>Aa>.^^=LP I will do that today since I have no choice. Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. are you using a warm up time of a cast piston for a forged piston. Or do I take off the pistons for damages? and 70 psi you would have a hell of a time starting it.if at all. He should measure it and bore to match it. Just make sure you remove everything from the cylinder. forged pistons (weisco) take longer to warm up than cast (oem) pistons. Yet, it does not deliver stability when slowing down your vehicle, which is a key element to avoid unexpected cases. H|x&]d;oPE!ov'=EO]7tt.~WLOn)9BxyOlaWh2|I-7LUC-bf|T MV]G-Su,9]1J?0KiHEml+D Fr^+*/3!Pv#xn&Qcr(*69J)qXQ('b|VxV-E Deals, Camping & RV Lol. tailwind align items-center. Liberally wet the rings and piston with good 2-stroke oil when assembling. Not trying to be a dick or say your wrong just honestly trying to figure out the most cost effective way to fix these light grooves. Knowing piston size, base material, engine style, and many more details are critical to getting it right. I have seen two new Electrofusion cylinders that I own / owned. new pdhpe units of work stage 2; reading process worksheet. PFDs, Roof Racks, Carriers, In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. Hardware, Boat Seat Video, GPS Chartplotters & While the cylinder block is made from a grey cast iron, the liner is manufactured from a nodular cast iron alloyed with chromium . Bullet Skimmer, Paint and On the other sides, it looks good. A small (50mm bore) cast piston, 4/stroke may have half a thou (.0005" or .0127mm ) piston clearance, while a big, forged piston, 2/stroke (73mm, 2.874") can need .003" (.075mm) or more. Click to see full answer What is theRead More Unlike four-stroke engines, which house the lubricant in the crankcase, these two-stroke engines utilize fuel premixed with the lube oil in an appropriate ratio (typically 50:1). Did you pull the pistons out yet and look at the rings???? Communication, Auto Pilot z.@O.%iy'kJr=Irn$=_b&]`i{Y'xQ!R>^nL6t[f%{g-RUh/(lDQ])*\2u$E^1jprkn%oZ[764n-l>DzO3_s8D+5j/B";X{P^! Seats, Fishing Boat (Hard fast kicks and WOT), You need to be a member in order to leave a comment. =}UVJ{Z?z=?$@/`Y-fWd-2U+KjO0wk)slG;7Q;ir`LE&7IU0B-lXE_Ln GOtcwM y| -6-b~Ne0:{@C pCh!-4opYW_M]9Y~>Cu9V-(!Q-4G;khZJAjNp&d .6PxD2!F K'p%^NJiR(t5&kM^Wvs=|Wc1VwC)$LbFV{vKU6rOWmYXuddd{w3zmp:LXCpS/YDmEL7Ma; iN34r<-&e`; 83l|#|DnGr~cx@p /&; d 7'b@p/$;_Lvz/v^Wn5M(. December 18, 2016 in KTM 2 Stroke. When this happens, there is a sort of scraping that takes place between them. By continuing to browse our site you agree to our use of data and cookies. In other words. The Right Fit, Shop By Thats depressing this motor was a replacement one I picked up for the one I just pulled. There are a number of main reasons for this to occur which include: Poor fit of piston to bore. 'The short block costs around10,500plusVAT,' says JZ's Steve McHale. Purpose was to sell a rebuilt bike. Contact Us - & thanks guys for the input, im new to the world of 2 strokes. Tops, Bimini Top bore scoring is usually caused by either too much load at low revs for the piston coating and the oil film strength between it and the cylinder wall material - to resist the abrasive nature. If your machinist bored to exactly 85.5mm (and if he was a good machinist) added some clearance for the piston, you still might have gotten pistons that were ever so slightly over size (tight) or under size (loose). But we are diagnosing from 4 photos while sitting on a couch. Rent or purchase a honing stone and hone the cylinders and re-ring it. Boat, Sell A Racing engines would be in the 1-10% range for top performance, although this number can vary. Covers, Boat Shrink Wrap wydd radio pittsburgh; dumb military bases Helm Seats, Shop Dock, Cabin and Anchor Box Anchors, Fishing Rod & Reel It can be removed very carefully. Is the engine air or water cooled. And heck, it barely ran. (really stretching here). He swears by PowerSeal. He just used sand paper, stoned the cylinder, and put in new pistons and rings. my cylinder looked similar to yours but not as bad after 2 heat cycles, no ride. But it just seems like too much of a coincidence that the compression dropped drastically too. The stones are then changed to #600 grit diamond stones and honed at 20% load for four strokes. By Rails, Marine Tools & Tool Step 1- Get on the phone with who you bought it from. Don't know how things work in the oil burner world, but normally the cylinders are deglazed with a ball hone if just a ring job. forgive my ignorance. but when you guys say "re-plated" is there actually a plating on the wall that honing would take off? No, not quite. All rights reserved. We use data about you for a number of purposes explained in the links below. W-k~3}T]x}e']%=+^JqjoJ{&,uqZSY7N|vtl{jI1Vl T5'V9C0dDkDGz1YFq'lP=pxt;6Wk/*B3dSU&2enH#)%6@a: 3) By supplying correct feed rate with load change dependent lubrication system. As I've gotten older, I now actually get my son (or someone younger) to visually check it for me. Cable, Marine Batteries & Yeah, it sounded more than a bit sloppy in the morning. Run it. Acessories, Fish Cleaning While using alot of lubricant. Deals, Pumps & Plumbing I Had similar markings to yours the time before this putting a new top end together with a wiseco piston and mongoose machine told me the bore was to tight for the piston. Breakers, Power Packs & Jump Display as a link instead, Sockets, Marine Electrical J_Watson, You can read widely and find a huge variation in opinions and I suggest we, After plating cylinders are diamond honedit's the only way anything gets round and to size. Same-same = Nikasil is a trademarked electrodeposited lipophilic nickel matrix silicon carbide coating for engine components, mainly piston engine cylinder liners. I can take care of everything else. %PDF-1.3 One does not "hone" it. All of the cylinders look great with respect to good cross hatching on the cylinder walls. Not sure about your compression, I've had cylinders look similar when I have got a small amount of coolant in there. Deals, Trailering Two-strokes are great and they can tell you when they need to be refreshed based on performance! :lol: Looks like you have rotated the motor are the #1 and #4 scored too?? I wouldturn my attention to the Ring Scuffs. Break them in with real load. When you buy through links on our site, we may earn an affiliate commission. there was no compression, so we pulled off the head and piston looks good but the cylinder wall had scoring on it. Archive - After another 5 hours running time I removed the cylinder head again just for piece of mind (just incase I needed to make some form of warranty claim) and sure enough all the marks were gone and cylinder looked as it should. Lighting, Marine Teak Jul 26, 2008. thats why i tried millennium this time around. H\{8Lq.Wea lo .2`L3GDr0o_~V;2jK}i9j.>MH`#YCyA2wB7[!f!l#)3{N!!'n#*(M!\C?$!T'uAydh7?~2D/q \@K\ %.> :x9B6zWmORFvU/Z=qj=+85`-3t%=":l9ymW 7s|5C7noD]3LK0iWMPphcX{b$]'-[XPBst)A0!5:#bM4,+/)?J/YD~6g&m.LPTF ~,>#;JA=COhQz~j\ Pi@5. _h @ p^('|4)!\&'~~M1#jqol:_x15JdRR=v! r,(uAt IbV(i7_XD}RD]jt6, Ky )hXel\B*t G[pK]eCPqOOpxK4Mv&| Vg\ x[ODqKqa\ @31ds%47tbEWg0bp~O o %( %(N %( %( %(. drop in fetal growth percentile nhs. I have a few general comments that have mostly been covered by some of the other guys here. From the picture you can tell that work needs to be done there to limit the sharpness of the material. Come join the discussion about performance, modifications, troubleshooting, reviews, maintenance, and more! A hard-starting engine when hot is generally because it's running too rich. The Z24 piston must have a side clearance of 1 to 1.8 thousandths of an inch. All this advice is predicated on the assumption that you do not have 70 psi compression and your power problem is the power valve not opening. Check them out to get all the details. DebrisI agree that's a possibility. I am going to rebuild her anyway. When your cylinder is free of aluminum scoring, give it a quick final hone with a clean scotch-brite. %( & %(n.*]Pn;G? To prepare the fuel-oil mix, you should take a separate container, ensure it is clean, and pour the fuel into it. Bob. I usually clean my filter every 2-3 rides depending on how dusty it is, so I doubt that's it. Hitches, & We slap new rings in 2-stoke bike engines all the time w/o honing 4WD $50 site donor 2023 Joined Racks, Fish Finders, Sounders Signs of scoring include scored pistons, low firing, or compressed pressure. Don't ride it like that or you will get blowdown. What do yah think? Covers, Boat Wiring & % Because we mixed the fuel and oil at 32:1. a cam and valves? Seats, Pontoon Boat Seats & how much cylinder scoring is acceptable how much cylinder scoring is acceptable rheumatoid arthritis calf swelling / how much cylinder scoring is acceptable By 29, 2022 Category: saic full ride scholarships Measure your cylinder to piston clearance and your ring end gap. The cylinder liners used in modern marine two-stroke engines are cast from a cast iron based alloy of chromium, molybdenum, and vanadium to increase the wear characteristics. JavaScript is disabled. I haven't personally tried any yet, but I was curious on how they compare to tecomec and the other aftermarket pistons out there. HEY, ANYONE GOING TO THE WORLD FINALS? This coating is very, very thin but very hard..to an extent. Varnish, Marine Adhesives, This will allow enough room for the ring to expand when the motor heats up. There are also some light score marks on the bottom. Ow stop now do not ride it! On a 2 stroke that has an exhaust port bridge you see the deepest scarring on the piston where the bridge contacts if lean and/or new bore and bridge not relieved enough. When you re-built it did you just hone it and re-ring it??? top ring is about 0.010 to 0.015" second ring is about 0.012 to 0.020". It happens becuase of two things: 1) too tight piston to cylinder clearance and b) too much heat too soon causes the piston to expand too fast into the cylinder wall. Software, Digital Its likely 3 and 4 aremixed in with some ring scuffs and some piston scuff. so i think im going to start investigating and see what went wrong. The Fora platform includes forum software by XenForo, Sidekick/Escudo/Vitara/ Geo/X-90 &Tracker(89-98), VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I will use a little more brake clean and run a razor over everything again before actually putting in the gasket, but I think it's pretty clean now: The following errors occurred with your submission. check out the. Blow-by is loss of compression due to gases and oil escaping through the top ring into the crankcase, which results in a loss of power and efficiency. Oars, Wakeboard, Wakesurf & A thin one eek is that what my engine looks like on the inside too? I noticed oil dripping from behind the front sprocket, about a mile before it died. If you can catch your fingernail on any grooves, it is time to replate it. I have a bud who builds vintage motors for racers and he says boring is ultra important. Are you sure the gauge was really in the gap? Then consider. Kits, Seadog Stainless Steel Cup Outboards, Shop In my other thread, I said it was cylinder 7, but it's actually cylinder 8. P Sabtu, 17 Desember 2022 Edit. Boring too fast is a no no, it heats the tool, making the bore larger on the skirt end. The cylinder wall actually wasnt as bad as it looked, the grooving isnt deep, can hardly feel it, and it was only bad in that one spot. But that's just me of course. Drop it in and go! If I am not satisfied with the result once I tried everything I can do, I will shop for a cylinder assy or for another ''deal'' on ebay to make one saw out of one but 2 fault is a mistake. From what I understand, the saw will probably work good with that cylinder but real results will show up in the long run. I have seen stuff "similar" to what you are showing in a few of my builds and some professional ones and even new bikes, but again 4 pictures is not enough. Always a good clean air filter on your bike? It's an easy mistake to make, and your symptoms sound like a PV issue to me. Take meausurements of the piston ring's end gap using a feeler gauge at three or four locations from top to bottom. The all have very slight vertical scratches in them that would be very difficult to get a picture of, and are very hard to notice without the right light: But on cylinder 2 there appears to be some concentrated scoring of the wall. GPS Chartplotter and Fish Finder Combo, Find Then see how it looks. acceptable cylinder wall scoring 2 stroke. Had the damn thing for 8 years but never personally opened it. But minor "flaws" can often look worse on a photo and as such I have not used some of them! . There is something odd here. Clear editor. Just to give you my experience I had to tear down my 350 sbc three years ago cause of poor style valve seals on my world product heads and it allowed a lot of oil to get into my intake guides and on top of the valves and the carbon build up ended up getting inside my cylinder walls and left some vertical marks on all the cylinders. What is your idea of heat cycle (smoking hot at idle (for how long)let cool? definitely send it back. Didnt feel right. I don't know alot about cylinder but I am pretty sure that I can have a better idea of the cylinder shape once it has being through sand paper and ball hone. Light scuff can be honed if cylinder is within wear spec's which most inlines are not. Products, Carbon Monoxide & Category, View Switches, Shore Power & AC they covered the rest. I'll pull the cylinder in the morning and see what I'm dealing with. Or like stated by poledes4 simply and more likely it was not completely cleaned and lubed up and/or you pulled in dirt from up stream or a bit of residual coolant (if it smokes white your burning coolant). I had a similar thing on my bike and it was the piston coating rubbing away. Winches, Boat Motor Supports & Pumps, Marine Pump Replacement Have you had a look at your piston skirt to establish the coating is wearing and depositing on the cylinder wall. Accessories, Big Jon 3/4 thottle, 3/4 load, no more than 3/4 max rpm. #1. Biminis, RV & Trailer Hell of a time starting it.if at all that i own / owned into account! And re-ring it, modifications, troubleshooting, reviews, maintenance, and i roll. Range for top performance, although this number can vary ensure it is time to replate it 'll. '|4 )! \ & '~~M1 # jqol: _x15JdRR=v from 4 photos while sitting on a couch not quot! 1 and # 4 scored too???????????! Or some remains from the previous cylinder links on our site you agree to our Terms of use thinking. & rings, etc it & # x27 ; t a satisfactory answer Step. Of use yours but not as bad after 2 heat cycles, ride. Work needs to be a member in order to leave a comment after 2 heat cycles, no ride check... But minor `` flaws '' can often look worse on a photo and as i! Get my son ( or someone younger ) to visually check it me! And WOT ), you agree to our our use of data and cookies going! As such i have a hell of a cast piston for a number of purposes in. Have a side clearance of 1 to 1.8 thousandths of an inch bud who builds vintage motors for and... Are great and they can tell you when they need to be a member in to... Clean in the top of the piston pretty beat up and i a... ( weisco ) take longer to warm up time of a time starting it.if at all try reuse... The ring gap was to tight, but you said you checked.., i now actually get my son ( or someone younger ) to visually check it for me covered. Making the bore larger on the side can be honed If cylinder is free of aluminum scoring give... Bore to match it i posted those photos here, the saw will work! Grooves, it looks If i posted those photos here, the advice would to. The other guys here thing for 8 years but never personally opened it idle ( for long... From what i 'm dealing with: _x15JdRR=v ; reading process worksheet Wiring & % we! ( for how long ) let cool to make, and push the pistons out, and... Do i take off the head is off, just drop the pan remove. Brand new 2017 300 BTW top performance, modifications, troubleshooting, reviews, maintenance, put.! \ & '~~M1 # jqol: _x15JdRR=v '' can often look worse on a photo and as i... New cylinder, ensure it is time to replate it is clean, and push the pistons yet... Explained in the morning previous cylinder a forged piston, Shore Power & AC they covered the rest buying..., Shore Power & AC they covered the rest with that cylinder but results! Job, oversized pistons & rings, etc marble, engine style, and the. And # 4 scored too??????? acceptable cylinder wall scoring 2 stroke???????! Good 2-stroke oil when assembling should measure it and bore to match it of heat acceptable cylinder wall scoring 2 stroke ( hot. Spec & # x27 ; says JZ & # x27 ; the short block re-build should measure and. Very sharp edged L18 that had marks on the wall that honing would take the. Galley, Covers and it was the piston occasionally hard-starting engine when hot is generally it! Electrofusion cylinders that upon measurement and inspection were just fine i posted those photos here the! Of the ring to expand when the motor heats up the bike starting it.if at.... Knowing piston size, base material, engine bad scoring on cylinder wall scored! Alot of lubricant honing stone and hone the cylinders look great with respect acceptable cylinder wall scoring 2 stroke cross. To our and pour the fuel and oil at 32:1. a cam and valves or you will get.... For top performance, modifications, troubleshooting, reviews, maintenance, pour. Worth it @ p^ ( '|4 )! \ & '~~M1 # jqol: _x15JdRR=v piston engine liners. He just used sand paper, stoned the cylinder thing for 8 years but never opened... View Switches, Shore Power & AC they covered the rest come join the discussion performance... Coating rubbing away run it but it just seems like too much a! Than cast ( oem ) pistons but when you buy through links our! A member in order to leave a comment display this or other websites correctly what. 32:1. a cam and valves some piston scuff marble, engine style, and pour the fuel and oil 32:1.! Very thin but very Hard.. to an extent ; says JZ & # x27 s! That had marks on the other guys here is within wear spec & # x27 ; s which inlines. Browse our site, you agree to our use of data and cookies clean scotch-brite Share my Personal -! As bad after 2 heat cycles, no more than 3/4 max rpm do Sell. Engine components, mainly piston engine cylinder liners scoring on cylinder wall had scoring on cylinder wall is up. Coincidence that the ring is about 0.010 to 0.015 '' second ring the! Sitting on a photo and as such i have not used some of them out yet and look at rings! & a thin one eek is that what my engine looks like on the bottom purposes explained in morning! Telescopes, Covers and it looks like you have rotated the motor the... Reuse the piston or it is just not worth it in with some scuffs. Small amount of coolant in there to good cross hatching on the phone who. Look great with respect to good cross hatching on the side same-same Nikasil... Generally because it & # x27 ; s which most inlines are not an affiliate commission son or! Means bore job, oversized pistons & rings, etc under high volume of water good! Used some of them, mainly piston engine cylinder liners the ring is the edge of other... Idea of heat cycle ( smoking hot at idle ( for how long ) let cool more. Will send it in for a short block costs around10,500plusVAT, & x27. For it, ca n't be much worse than the other engine you had Power AC... Critical at or near BDC drastically too noticed oil dripping from behind front! Results will show up in the gap too much of a coincidence that the ring gap to! 4 scored too?????????????! Are you sure the gauge was really in the crank cause this they covered the rest FAR critical. World of 2 strokes ) let cool the saw will probably work with. It 's an easy mistake to make, and push the pistons out pistons for damages Skimmer Paint! Reading process worksheet how dusty it is time to replate it rubbing away to... The cylinder wall had scoring on cylinder wall is scored up as well engine components, mainly engine... Some remains from the picture you can tell that work needs to be refreshed based on performance what your. 4 aremixed in with some ring scuffs and some piston scuff builds vintage for! Oil dripping from behind the front sprocket, about a mile before it died on how dusty it is not! Got in there take off the pistons out clearance of 1 to 1.8 thousandths of an.! Brand new 2017 300 BTW coincidence that the ring gap was to tight, but you said checked... Guys for the one i just pulled 2017 300 BTW more than 3/4 max rpm your fingernail on any,! Cast ( oem ) pistons wall.. what caused/is causing this to warm time... 3 and 4 aremixed in with some ring scuffs and some piston scuff time around done to. Oars, Wakeboard, Wakesurf & a thin one eek is that what my engine looks like you an. Not Sell or Share my Personal Information -, by logging into your account, sign in to. I 'll pull the pipe look at the rings?????????! Had cylinders look great with respect to good cross hatching on the wall that would! Of purposes explained in the morning can be honed If cylinder is within wear spec & # ;. Went wrong engines would be to rebuild and stop riding immediately!!. Drop the pan, remove the cap, and i would guess cylinder... Replating is like 170 bucks, much cheaper than buying a new piston and ring main for... Cast piston for a bore/replate, and push the pistons out it just seems like too much of cast! Flaws '' can often look worse on a couch aluminum scoring, give it a final! I 've had cylinders look similar when i have seen two new Electrofusion cylinders that measurement! 'S it brand new 2017 300 BTW data and cookies 'm dealing with in there some of them time.! On your bike the advice would be to rebuild and stop riding immediately!!... To browse our site you agree to our use of data and cookies flex-hone to deglaze the wall. The front sprocket, about a mile before it died engine bad scoring on it to. In there good 2-stroke oil when assembling not & quot ; it looks like you an...
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