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Found 80 results

  1. How can i fix this? Why is this happening when everything else if fine? Took it to a machine shop guy said 100 in labor to do sleeve and he said he didnt know if they made sleeves but they do. Im considering on buying a brandnew cylinder but lots of money didnt know if cylinder could be fixed or this will happen again. Heres the piston, then top of jug has chips taken out 30-50 thousandths
  2. 1995 cr250, had cylinder bored and sleeved with la sleeve. Sleeve not installed right and ports on cylinder do not match sleeve ports turned about 1/8 from being lined up. Can it be fixed or is it permanent? Please give useful advise, much appreciated.
  3. I have a 99 kx 250 that needs a cylinder. I need to know if a 94 kx 250 cylinder is compatible with the 99 model assuming I use the 94 power valves? the bidding ends in a few hours
  4. Greets to all. I'm about to install an Athena BB kit on my S. Kit comes with a single layer base gasket an gives 12.3:1 compression ratio. I've been thinking about bumping up the compression a bit. No budget available for a hi-comp piston, so I was thinking of machining the cylinder face down a couple of tenths of a millimeter. I have access to machinery needed for the task, so cost is out of the question. Will check piston-to-deck height and all before proceeding. My main concern is the nikasil coating, actually the point it "finishes" at the top of the bore. There's a chamfer right there, measures over half a mm high, so could easily be ok. But I need confirmation, wouldn't want to ruin my BB. Anyone done that before? Any problems with it? Thanks in advance. Lefteris.
  5. So I have an 07 cr 125 fouling plugs before the bike even has a chance to warm up, plugs come out wet and oily on the tip. had both crank seals replaced last season because my main drive side seal blew. While it was split I had a new crank put in, we noticed my cylinder plating was pooched so I sent my cylinder off to be re-plated, put a new piston in the shiny new looking cylinder put the old warped head back on and called it a day. then rode it all season having absolutely no idea about the warped head because I overlooked it when I was excited to put my bike back together and ride. Its now winter, snows on the ground. I recently went to go for a put and fouled a plug before I could get to the end of the street and back. I was also smelling coolant so checked the rad while running the bike, lots of movement and tiny bubbes. Pulled the head off and sure enough it was warped to the point where I could rock it back amd fourth on the mirror and see a small gap... so NOW after I replaced the head my problems persisted and I can still see little bubbles swirling around vigorously in the rad if I rev it with the cap off, I've had boiled it down to my cylinder probably being warped then I found a leaky hose by the exhaust that was dripping coolant onto the outside of the exhaust port. Which brings me to what I think may be an incredibly stupid question, could it just be the loose hose sucking in air that is causing my rad fluid to have small bubbles in it? And maybe im just experiencing increadibly rich jetting now that my head is actually sealed properly? over and out.
  6. Hello all! Long time lurker here, great site! Long story short, I pick up a bike with low compression for a little project. I notice "FMF" on the side of the cylinder ask him if he knows anything about it? He replies "the guy I got it from said it was an FMF race bike, but I don't think so. Figured someone just carved that in the side." I have never had my other yz250 apart, looking at the ports and comparing them to the few pictures I have found, it does not seem the cylinder was ported. Admittedly, I very inexperienced when it comes to any 2 stroke porting. Stock rebuilds is how I have always rolled. Also, I noticed the "c12 only" but the head only looks lightly milled, if at all. Any expert eyes out that have some input? I am trying to keep this rebuild reasonable since the holidays are around the corner. There is a gouge in the cylinder from the ring breaking. Last time i sent a cylinder off for repair it was 350ish. If it is a stock cylinder I may try to find a used one in good shape a little cheaper. Any help or suggestions would be great appreciated!
  7. HI. So i am in the process of putting new studs on the cylinder in my 2001 CR80r! I am just wondering if i need to torque the studs if so what is the torque spec?
  8. Will a stock 1992 125cc 54mm kx125 bore cylinder, fit a 1995 kx125? PLEASE HELP
  9. I have a sikk-MX trail bike. And tried to extract a snapped bolt....snapped the easy out inside the bolt casing/shell(I drilled a hole through said stick bolt). I cant figure out which 52.4mm cylinder head to replace it with. Does anyone know? I also cant figure out the headlight wiring to my tusk headlight...if anyone has any schematics for that...please help. And does anyone know what larger/largest size tire or rim will fit on these bikes? Cuz these tires are pathetic.
  10. Does anyone know where to get a cylinder honed/resurfaced? Looking at ebay for a "slightly used" one and i'm finding a couple for a decent price but I would like to touch them up a bit. Any input would be appreciated, thanks.
  11. I have this spark plug o ring left to install, and I cannot for the life of me figure out where to put it and I don't want to chance it and install it the wrong way. will someone please tell me where this thing goes.
  12. Alright, so I just got done rebuilding the top end on my 07 KX 450F and as I am getting ready to install the top of the cylinder head I notice I have one last piece remaining that I can't account for. I mark everything and take several pictures so I can make sure everything is put back together perfectly, but somehow this piece evaded me. I showed where I think it goes in one of the pictures I provided. Can someone tell me if I am right or if this piece goes somewhere completely different?
  13. My '05 SM had it's rod bearing go out at 15,000 miles and scored my cylinder so its time for a rebuild. I already have the engine out and cases split, just getting ready to clean and inspect everything and spend lots of money. Bike as of now has 3x3, full Yosh RS3 Off-Road exhaust, and JD jet kit. The plan so far is to get: Hot Rods Crank Assembly Cylinder Works Big Bore Kit Cam Chain MCCT FCR 39 (hey why not) My main question is if I should replace the engine bearings or not. I feel like I should since I have the engine apart and plan not to have it again for a while, but its around $200 for main, transmission, counter balance, etc. I could not find anything about inspecting bearings aside from feeling smoothness. Is there anything that indicates I should replace bearings? Should they be fine? Or dont risk it and replace all since I had metal running through the oil? Let me know what you think along with any recommendations for the build. I plan on skipping out on the stroker to eliminate challenges with compression and reliability and skip out on cams for the sake of $$$.
  14. I bought a 1985 KX125 for a $100. It’s in pieces but it’s all there. One thing I ran into is this cylinder. It’s scored on the inside. I think the top end blew up on this that’s why it’s apart. Wanna see what you guys think. Is it ok to where I can hone it out myself or should I send it out, I know a local place. My friend works on bikes a lot and he says it’s not too bad I could do either or. I’ve done a few cylinders so far so I know about the cross hatching and stuff. Spec size is 56.00mm
  15. Hello u guys I have to do a full service on my 2006 250 exc, it’s an eu model. I have a big big scratch on the cylinder, and I don’t want to reuse it. i’ve seen some things that I can do with it One of my wishlists it’s a 300 upgrade, and I need to know what do I need to change to a 300 convertion, and if you can tell me which other upgrades I can do with it, from newer models, like an electric starter, mapping, and other stuff, just because I don’t know if the parts of the newer models like a 2011/12/13 cylinder fits my engine. please let me know if you can help
  16. Does anybody know if ya can still get new cylinders to suit a 93 kx 250 , Iv looked online just about everywhere by now , closest thing I could find was on ebay but to suit 2000 model , I have searched the forum but couldn't find the info needed , must be to suit 93 model!! ( need to get the old beast going again )
  17. My CRF450R was hard to start, so I took it to a shop for Valve inspection They found the valves were way off, and they have now been set to: 222 on Top 2, 179 on Bottom 2 But they warned of a very big problem - the Upper Right Cam Tower bolt is stripped in the threading, and said that would require a new Head replacement They also said the Tensioner has no tension So I am wondering how serious of a problem the Stripped Threading is on the Head, because it seems to be very expensive fix. But they also said when the Cover is on, the bolt cannot escape. Some Question: 1) If I do ride it like this, can the problem get any worse - or has the damage been done and I may as well keep riding until it stops running if an entire head is to be replaced anyways 2) What parts will I exactly need in the replacement - because if I search for CRF450R HEAD, there are multiple parts packages and they are so pricey I want to ensure I get only what I need - seems like I may want to replace Valves too if they are close; and is the Tensioner a part of that package? 3) Should I try to get a Big Bore kit or something, so the large expenditure of time and money at least puts me to a point of better than stock? Thanks in advance - let me know if any pics or anything can help - really a sad day
  18. I couldn't find any markings from the cylinder (expect 66/17AR), didn't open powervalve covers though. I would be happy to hear where the size marking is (size 1 or 2).
  19. Seized my engine last weekend because i put in my oil filter one backwards... i'm a dummy. Needles to say I need a new cylinder and a new piston this is what i'm ordering or at least planning to order.. Piston : https://www.rockymountainatvmc.com/p/974/3784/Wiseco-Piston-Kit?v=533&s=47466 Cylinder: http://www.ebay.com/itm/2004-KAWASAKI-KX250F-OEM-CYLINDER-JUG-TOPEND-TOP-END-KX250-KX-250F-250-F-RMZ250/192304125998?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 going used on the cylinder to save some money. My question is.. has anyone done one of these and if so do you have a step by step how to? or know of a video on how to do it? on a bit of a budget and want to get back riding as soon as possible. Thanks for looking!
  20. Hey guys - I got a pretty good deal on a used 98 RM125 but when I pulled the cylinder to inspect, I saw a crack. When I asked the seller about it, he said he's been riding with that crack for over a year with no issues. "He says" that his mechanic told him it was not worth getting the cylinder honed / plated given the cost. What are your thoughts? I am thinking it needs to be repaired but wanted some additional opinions from experienced riders and / or mechanics. thanks for your help! Chris
  21. Hello great people of thumper talk. Well I've been having some problems with my old 2002 YZ250F. I was riding a few days ago when my bike just sputtered to a stop almost like it ran out of gas. Well gas was not the problem and I couldn't get her to run she would only fire for a second then die. I found that one of my TPS wires snapped, so I figured the reason it wasn't running was because of that wire. After soldering it back together it was still doing the same thing, so I just left it for the night. When I came back the next day whilst kicking it over I noticed all of a sudden the kicker stopped. the motor was seized. I tried turning the crankshaft at the flywheel and it would not budge forward at all but it would turn backwards or clockwise, so from here I figure I'll start taking the bike apart and figure out whats locking it up. Once I removed the cylinder head I was at a surprise when I saw this relatively large piece of brass sitting on top of my piston. I was thinking where in the hell did that come from. It was getting too late for me to go any further tonight, so I figured I would post a picture on here to see if anyone can tell me what they think this piece may go to. Is it something in the crank maybe up by the valves, from the carburetor I have no idea. It just amazes me that the piece is so intact since it was sitting on top of my piston. Also after that I did try turning the crank again, and it did turn but it felt horrible. It was very clunky and it sounded like shit might be grinding in there so I stopped. Well thanks for taking a look and if you have any insight as to where that piece might have come from please let me know. Other than that I'll be breakin her down further tomorrow.
  22. Hi All, I just bought a beautiful 2002 KX125 but it's missing the cylinder. I can't find one anywhere! The parts fiche shows no compatible parts other than 2002. Anyone have ideas? Can I get a 99-2002 cylinder and just make sure I get the piston for it too? They seem to be different sizes. Also, if anyone has a used one, please hit me up! mark.andresen@gmail.com
  23. First post...and of course I'm asking for help. Somehow my son demolished the piston on his kx85 (2009). Cylinder is slightly gouged near the exhaust port and cylinder head shows signs of overheating. Could I get by with a cylinder sleeve in this situation? If so, could I get it pressed in at a machine shop or is it better to go to a moto shop? ...Or is it better to replace the entire cylinder jug? If so, any suggestions on good brands (or brands to avoid)? I'm a 2-stroke newbie...any advice would be greatly appreciated!
  24. I'm thinking about using high heat powder coating (rated up to 1200F) to powder coat a XR600 engine. To powdercoat, I will have to bake the side covers / head / cylinder at 450F for 20 min in an oven. Will this warp and permanently damage the head / cylinder? I'm not too worried about the side covers because I can actually use normal low temp powder coat and thus bake them at 375F. But I am worried about the head and cylinder because I will have to get them to 450F. What do you think? Will this warp the cylinder/head? Its an old beat up XR6 that I'm restoring, not to worried about it, but would rather not buy new parts. Thanks.
  25. Apologies for the long post, but I’m including as much info as possible. I have a 2-Stroke Yamaha TDR250 1KT, same motor as the TZR250 apparently. I just completed a top-end rebuild. I only replaced the left piston as the right one look good. Probably should have replaced both, but anyway… My problem is the right cylinder/exhaust gets very hot very quickly and smokes a lot. The exhaust is hot only after 30 seconds of idling. The left remains room temperature and does not smoke. I don’t want to ride it too much in case it causes irreparable damage. But when I did try to ride her, I can only get a few hundred meters before she cuts out. I have to start again and can not get into 2nd gear before it stalls again. I’d have to limp home at a bicycle’s pace as anything above idle revs kills the engine. Not sure if the poor running is related to the hot exhaust, or another problem entirely. I’ve done the following troubleshooting: - swapped around plugs – no difference - swapped around plug leads – no difference - swapped around Carburetors (but not the Jet Needles) – This then made the left cylinder smoke and the right smoked a little, but not as much as previously. The carbs are back on their original sides as they are specifically left and right. - sprayed carb cleaner onto the carb boots to test for air leaks and that had no effect. - Raised the Jet Needle in the right carb for a richer mixture – It appears to smoke less (could be my imagination), but it still gets hot quickly. - Checked the plugs again and the troublesome cylinder’s plug looks to be running very rich (all dirty), so I lowered the needle this time for a leaner mixture. Still no difference. I removed the exhaust and wiped my finger in the cylinder’s exhaust port. Looks like black paint! Has anyone ever experienced this and what was the solution?
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