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Found 105 results

  1. So I have a 1998 Yamaha Yz80, and I need a new top end. I found a 2002-2017 Yz85 piston kit, for a very reasonable price, and I was wondering if it would be able to fit my 98 Yz80? Would the piston, wrist pin, bearings, rings, Etc be able to fit? And will it work?
  2. I am rebuilding the top end on my yz250 this winter and need to know what piston to get. I am getting an oem piston and I'm unsure how to identify what piston I need. I believe there are 3 different oem pistons. Anyone know where the identifying marks are?
  3. Hey, new member here looking for opinions I have about 8k miles on my 2015 DRZ400sm. I was riding about 80mph and felt a momentary loss of power, dropped off the throttle and it felt ok. At the next stop i could here top end noise like the piston was tapping so i tore it apart and found: The upper piston ring was ok, the lower was stuck in the groove (flush with the piston ) and unable to move around the piston. there was scuffing on both intake and exhaust side of the jug and piston. Before tearing apart i did a leakdown and could hear air from exhaust and from down by the timing chain. I will try to post pic and video with this post Bike was running great then had started puffing smoke when i get on it quick, and the idle would fluctuate a good bit 2015 DRZ- 3x3, k&n filter, FCR39 (with eddie mod) DRZ E airbox boot and exhaust header with drilled out stock SM muffler with "power tip"
  4. I was an idiot and accidentally over-tightened my spark plug on my KX450. In doing so I put a slight indention right in the center of the piston that you can see in the attached photo. I was wondering if this is enough damage to warrant me buying an entirely new piston? Or will I be okay to continue using this one?
  5. Hi everyone, My yz125 has 22 hours on the current top end and 77 hours on the cylinder and I took off the pipe to fix my radiator hose and figured I might as well take a look into the exhaust port. I run a double ring forged piston from wössner and it still has the machining marks that hold the oil and it still has the black coating so it looks very good as far as I can tell. It doesn’t show any hotstreaks is what I’m trying to say 😅. The bike has good compression as far as I can tell by pushing the Kickstarter down, it starts first kick and runs strong 💪. I did however notice that there are black horizontal marks on the cylinder wall above the intake port. I attached a pictures so you guys be the judge, is this concerning or nothing to worry about? Thanks!
  6. So I messed up and got 66mm rings instead of 65.5 which I believe is the correct size rings for stock bore on a 1990 xr 200. Can I just gap to spec and send it or do I need to buy some 65.5mm rings?? Sorry if its a no-brainer but I hate to wait for more rings to come in the mail if there's no reason to.
  7. I just bought a 1999 kx 125 and wanted to inspect the top end so i took off the pipe and looked through the exhaust port and saw the images below, I am new to this but i think that that is blow by meaning i could use a new top end. What do you guys think that I should do, if anything?
  8. K so I am getting so frustrated with this bike? the problem is when I looked down at my piston with a camera there was absolutely no carbon buildup on the piston and it still looks new. What could cause this? The bike is a 2001 cr80r. (Thanks)
  9. Buckle in this is a long one. Any advice is appreciated! I have a 2011 RMZ 250 that has done me very well for 4 years. Has been a very reliable bike with lots of power. Last year it started to act up a bit, slightly less power & became more difficult to start, especially cold (side note: it’s a Suzuki so it’s never started great cold but usually 3 or 4th kick was the case). Still ran okay though & fiddled with the fuel screw a bit which seemed to help with the starting/power issue for the rest of the season. This past winter we pulled it apart, put a brand new piston in, checked the valve clearances, moderate amount of carbon build up on the valves which we cleaned off, and put in a new spark plug which is also in spec. Bike still wouldn’t start great cold but was starting on about the 8-10th kick and power seemed to be improved although not 100%. I’ve take it for quite a few rides now and broken the new piston in and am having more issues: -won’t kick over cold at all but bump starts just fine -will kick over first or 2nd kick when warm but NOT when the bike starts to get even slightly hot -very little top end power. Bottom of the gears seem to be full power and the hotter the bike gets the less power I have in the top end -bike began to backfire quiet a bit when hot -won’t idle in gear when hot Any advice on what to replace/trouble shoot next? I had a buddy tell me it could be a worn out injector so that’s what I’m looking at replacing next. Thanks!
  10. Hi from Italy, I have a suzuki rmx 450 2010 with 7000 km on the engine. Does someone know how often should be replaced a piston (plus timing chain) on this bike? I ask this because on the user manual piston change intervals are not mentioned. I asked some dealers and someone said to go straight to 20000 km and then rebuild both top and bottom end, others said 150 hours more or less.. I use the bike both in mx track and on the road (with second set of wheels) Another question: is the RMX piston the same as for the RMZ? I know they have different compression ratios (11.6:1 vs 12.2:1) and I'm not interested in increasing it as I want my engine to last. Thank you very much!
  11. Good day I have been having a problem with my spark plugs. Every 0.5-1 hour of riding the bike will begin to miss fire due to the spark plug insulator being cracked just below the electrode. (exactly the same everytime) The plug has some oil on it as, expected, but nothing close to causing oil fouling. 2018 ktm 250 xcw (carb) nothing has changed with the bike, the problem suddenly started at random. I have been through roughly 8 plugs (ngk br7es) and it continues, bike runs perfectly with a new plug until the it breaks once again. All jetting seems good and as I said this problem started suddenly and randomly as the bike had been running without a single problem since I have had it. a new piston and rings were installed at 60 hours and the problem still continues exactly the same. Thanks in advanced 50:1 oil ratio (moterx) as I have always 55 hours on 1 plug and then 8 within less than 10 hours??? this isnt my spark plug but the damage to the white insulator is similar
  12. I just bought an old 85 suzuki lt185. It runs but is in desperate need of a top end rebuild and I thought it would be a great project to do with my kids. Unfortunately I'm having a hard time finding part for that particular model and was wondering if there was any alternative cylinders, heads, pistons, etc that would bolt up and function properly that would be easier to find?
  13. Bike was running extremely rough (similar to running very lean, lots of backfiring and very loud) when I started it, and billowing white smoke. The oil also smelled of gas, which may be a result of flooding it trying to get it started so many times prior but it could be rings as well. In case it was the coolant causing that white smoke I figured I'd change the headgasket since I needed a project during all this quarantine business, and I found some scoring on the exhaust side of my cylinder (pictured). I can just barely feel the largest score with my finger, the others are smooth to the touch. I included a picture of my piston as well. Should I do anything about this? I don't want to mess up my cylinder if it was just a problem with my carb, etc.
  14. Hi Guys, I have an 02' CR125r. I recently rebuilt the top end (new piston / rings / gaskets) and checked the tolerance of the cylinder to confirm correct piston size. Bike started and ran great right after the rebuild. The next week I went trail riding and initially the bike ran like a top! After about 1-2 hours of seat time, (not riding balls to the walls) the bike just died mid ride.. I let the bike cool down and then found I had zero compression. I replaced the plug as a quick troubleshoot but that did no justice. I have yet to tear the top end apart. Any thoughts as to whats going on? Or has someone else experienced something similar ? Appreciate the help!
  15. Hi all, I have the option to buy locally a Big Bore Stroker kit. Most of the kit a I am familiar with, it contains a Cylinder Works barrel PN# 41001, a Crank Works stroker rank (waiting on model number) and this piston: That I have never seen before or used. It look like this collection of goodies was purchased as a kit so this may have been a common piston before Vertex? Any comments?
  16. Hi, I am doing the top end on my ‘19 Yz125x. The cylinder has the letter C at the back so do I put a C piston in it? I just ordered 2 C size pistons for the next two top ends. Will it be fine? Thanks!
  17. Hello everyone. So I'm stuck...I have done rebuilds before and never seen this...I'm by no means a pro. I did a piston and ring install, rockers, and it all went well. Line up TDC, put on head cover and go to check rockers for a little play...exhaust valve has it, intake doesn't...tried 9 times making sure it's even and same result. As soon as bolts get to about 5lbs or less...prob less the rocker won't budge. Is this normal...I should have free play if I'm at TDC on compression stroke...thanks
  18. I bought a 2010 KX250f from a guy who bought the bike brand new back in 2010 (only had 1 owner). The guy put a high compression piston in this bike. Also he was pretty much running straight race gas because when he took it to the shop, they must have messed with the jets because they weren’t stock anymore. I got new jets. Currently at...........………Pilot Jet - 42. Main Jet 185 I’ve messed with my air screw and tried a few things out but I still have to kick my bike like 30 times before it finally starts! The piston is supposed to be high compression but it doesn’t feel that way. I’m thinking of just replacing it and going back to stock??? Any thoughts? Ive read that valve clearance is an issue with this year bike... Also that Kawis need a little throttle when you kick. It ends up flooding every time. Send help please!!
  19. HI. I have CRF450r 2007. (Sorry for my inglish. I am from Georgia. Tbilisi ) thanks . I want to by Wiseco or same piston. My bike bore size is 96.03 mm (I do not know for sure. Car engine master told me). I am interesting about clearance between bore and Wiseco piston. What clearance will be between wiseco piston and my bike bore ? What size of same piston i need tu buy for my baike bore size? What is the real size of wiseco piston for crf 450r/ or maby will i buy another brand piston. When i look to my cylynder, i see good hone and it looks like new. mayby engine master is vrong about size.
  20. Hi guys! I'm wondering if any of you know for sure if the advertised compression ratio of CP Carrillo piston for our bike is achieved with the single layer base gasket (.010" thickness) or with the standard 3 layers base gasket (.030" thickness). I'm asking this because I noticed they offer the same piston (12.5 cr) for both LTZ and DRZ but with different gasket kit, and it seems odd to me since it's the same engine.
  21. Is there supposed to be a bit of resistance? Is it warped? Is the pin worn out? Can I run it without damaging the cylinder? https://streamable.com/mll5b
  22. I just picked up a 93 kx 250 traded my 125 since it need a piston no problem i thought so i went to find the piston size for it but mine is a big bored at 73.8mm i just don't know where to find the new piston i was told by the owner that i could just search 73.8 mm piston and buy any one but i highly doubt that so if anyone can point me in the right direction that would be great thanks. Posted some pic below to see if it helps.
  23. Hi all. For those that have done top end rebuilds / piston replacements, what's your opinions/experiences on the following manufacturers? Consider this a bit of 'research' I'm doing before buying one kit or another for my rebuild. Plenty to chose from. Here come the opinions---and I appreciate it in advance. Thanks! Wiseco? Namura? Pro X? Vertex? Wossner? (and my favorite, based on name...) Outlaw Racing?
  24. hi guys, im rebuilding my drz400 engine and ive heard that your cylinder and piston need to be matched, i am debating getting my old cylinder re-plated or buying a new one, if i was to buy a stock 90mm cylinder would it work with my piston? (a brand new wiseco, measuring 89.96mm)
  25. Hey guys, I recently got my cylinder re sleeved. The head was also in very very bad shape, so the mechanic fixed that also. It had lots of deep gouges and scratches. The piston now hits the head before it can reach top dead center so the kickstart will not move. I don’t know what to do, can anyone help?
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