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Hey,This is my first forom.I have a KX250f that I’ve been doing some engine maintenance And the camlobe cover snapped in two.Clean snap,I’m wondering should I weld it back together or just get a new one? thanks.
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Hello! First post. I just bought my first trail bike, a ‘12 250X from a work friend. I only just got back into riding with my ‘04 CR250R after about a 9 year break, and up to this point have only be knowledgeable enough to take care of basic maintenance on the 2-stroke. I picked up the 250X for $1,500 knowing that it possibly needs a top end rebuild. The piston and rod seem intact, and I have a reman’d cylinder. What internal wear and tear do I need to be looking and measuring to judge what I do/don’t need to replace?
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09' WR450F So as of right now I've had this bike for 2 years. I have fully serviced, replaced, or upgraded (just about) everything except for the engine. After fixing all the external oil leaks, I now know it's burning about 75ml / about 25 miles of woods riding. Also I don't have any knowledge about what has been serviced, or not by the previous owners. Frankly I'm impressed by how well it runs compered to the rest of the bikes maintenance by the p.o.. Obviously some things can't be judged until I crack it open.... But I do know I'm going to do valves, timing chain & piston/rings. And most likely all bearings, oil pump & crank (all OEM). Should I do YZf cams also (I think it might have hot cams, I can't find any stamping on them...?)? Which brand of piston is recommended? Should I do OEM, or Kibble White valves? (I'll most likely do S.S. rather than Titanium, I prefer longevity over a few extra revs). Thanks in advance fo your recommendations & any additional input!!! ?
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I have a question about my 2003 rm250, I have pulled it all a part and I’m cleaning it up for next season and when I got to the engine I tried to put the base gasket on but it wouldn’t fit. At first I thought I may have ordered the wrong gaskets but then I started looking at the my cases compared to other cases from an 03 rm it looks completely different I just need to figure out which year the engine is from and which base gasket will correctly fit
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been looking into rebuilding my 02 cr125 and have heard not to go with namura or wisco but some say wisco is still good.. just wondering what the best rebuild kit to buy for one of these would be
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Ok so here goes... (See pics and feel free to comment on what you see or think.... Any help is good...) I have my work cut out for me. I have never done more than maint. and minor repairs to bikes.... Today I started some disassembly and found trans oil was gray with some metal flake in it... The radiators are beyond repair. The trashed piston is off now... I got the chain off, rear wheel off and cleaned up and filled with air (20psi), will check it tomorrow to see if holding air or do i have to take apart and patch (wheel bearings feel good, so will just do seals), rear brake caliper needs once over, also master cyl., Needs new pads I think I can save rotor... Sprockets seem shot. Not sure how to tell if chain is still good THERE SEEMS TO BE WATER IN THE BOTTOM END???? so gonna disassemble far enough to get engine out to try and lessen any damage.. I have case splitter, fly puller, fly holder, crank puller. There seems to be NO spark I am guessing stator is wet and trash... Game plan is to clean out and protect engine inners with assembly oil or just a coat of 2 stroke... until I am ready to rebuild.... Also found some play in the swing arm so will have to do the swing arm linkage/ bearing kit... Pretty productive day.... Oh yeah I found a copy of the CLYMER manual and it shipped out today.
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I recently got a "Kinetic" motorcycle, a brand that I researched very little before buying it for dirt cheap. The brand apparently originated in USA and was aimed at the Indian market but a couple found their way to other parts of the world. The bikes are no longer manufactured and I need guidance on spares. Articles on the history of this brand mention that the owners of the brand had an agreement and incorporated Hyosung technology. NOW, since this seem to be a mix and match type matzo pudding, I have no idea what parts have been used where in the motor!!! Which makes thing worse, they made a limited number of 170cc 4t 4 valve engines and there seems very little or no tech literature available on this. ANY assistance would be appreciated.
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I bought an 04 Crf450r with the right side crank case blown out from the inside where the kickstart shaft blew out from laying on its side, my question here is would I be able to use a right side crank case from an 05-07 if I just find out what needs milled down as far as mounting back to the frame? All I can find is a used right side from an 05. Thanks in advance for the input
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I’ve just gotten this bike last month. It’s a 2020 kx 85 and it has done great since. The bike was amazing and when I first got it with no problems. Last week me and my friends went riding for 4 hours. When I started to ride back to my house the bike sputtered and I could feel some lag in the throttle. I was in 4th gear when the engine just completely shut down and I had to pull in the clutch and go to the side of the road. I thought nothing of it at the moment. Usually the bike starts 1st kick but it took about 5 kicks to start it up again. I went on for a quarter mile then the bike died again. This time it wouldn’t start no matter what. I kicked about 50 times turning the choke on and off, checking if the gas was off but nothing would work. At a top of a hill I tried to bump start it. I heard it start for maybe a second but immediately died right after. The bike was hot too so I don’t understand. The bike still has the same compression as before. I’m fairly new to dirt biking so I have no idea what the problem is.
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Hello! So I've recently picked up a bike that's got some years on the neck. So I decided to check the crankshaft and atleast replace the crankshaft bearings. But since I know this is a very delicate job I want to make sure I do it right. Firstly. What is the safest way to split the engine? I am aware that I will need a flywheel puller to be able to split the engine blocks in the first place. But is it necessary to have a "engine block splitter tool" or whatever it's called. Can it be done without one without damaging the crankshaft? Secondly. Is it 100% safe to heat up the crank case when installing new ball bearings? Aswell as freezing the ball bearings? I was also told by a friend that if I get a new crankshaft I should get it balanced. Is this really necessary? Aren't the cranks balanced before selling? And while I'm at it... Are there any other major things to look over on an old bike?
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- Honda
- crankshaft
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For those experienced XR engine / carb tuners, if I show you this plug and tell you it’s got around 150 miles on it, mixed cruising and hill climb in hot CA summer weather, how would you read my carb tune? Tell me what you think then I’ll tell you the symptoms I’m having. Thanks!
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Hey! I have a 1998 Honda XR250R with a buggered engine. I found a reconditioned XR250R engine for sale but it's a 1994 model. Does anyone know if this older engine will fit 1998 bike frame? Thanks!
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I just rebuilt my 2017 kx100 and the shift shaft broke so I was going to replace it but I can’t because the clutch hub and basket won’t come off. I don’t know why? I took the nut off and everything but it won’t come off. Any solutions or how to take it off??? Thanks!
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Ok so I have a yfz 450 that had a piece on the left side crank case that broke off (my fault) when splitting the cases. I got it welded and it doesn't leak oil anywhere but where it broke is on the semi circle shape that goes around the crank and now that piece isnt flush with the right side crank case. The bike runs fine? And doesn't leak from said spot however I'm worried that maybe there would be an issue with oil sloshing back or any issues related. In the picture I circled the spot
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After a fresh replate by millennium technologies (they had access to this new piston for sizing), a new wiseco piston with proper exhaust bridge holes drilled, new wrist pin and bearing, and new power valves, my 2001 rm125 has a rattling sound coming from the engine. This bike is seriously testing me. It hasn’t given back what I’ve put into it in the slightest. Someone please help me diagnose this noise. I have a video of it running in this YouTube link: https://youtube.com/shorts/sBJHr1Bg7iQ?feature=share
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Hey guys! I got my hands on an 84 XL600R That's in pretty good condition. Doing the licence and registration right now, the bike has 62.000km in it so it wasn't over used but im a little worried about the timing chain guides not being manufactured anymore. I was wondering if i could move he whole timing assembly (the sprockets, guides, and chain) From a more fresh platform that still has some manufacturing background to it. I'm sure im not the only one thinking about this.
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Hi I recently bought a 2019 Beta 500 rr-s that had a failed cam in the top end. This sent aluminum fragments though out the engine. A dealership has recommended the replacement of Crank, Crank cases and top end. I have the new top end I'll be ordering the Crank soon. I'm just wondering if you guys would agree the Crank cases need to be replaced as well. There concern was the oil pressure after the damage from the aluminum fragments. I already have a new oil pump for the left side of the engine and I'm going to buy one for the right side. Would that be enough or should the cases be replaced too? Thanks for any advice.
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The reliability and simplicity of a big single cylinder motorcycle is something I desire - more specifically I am drawn to the legendary and robust dual-sport XT/TT 500. I am all for the power to weight ratio of these workhorses, but I cannot seem to get my hands on a road-legal one in CANADA. I can, however, get my hands on the engine alone, and a deal of a used 1986 XT600! There is no urgency in my pursuit of the ever-alluding XT500 frame-with-ownership... but the idea of the ever-reliable 2-valve 500 single with mono shock rear suspension... a thumper of pure beauty. They are both conveniently dry sump to my understanding. The 1986 XT600 was even 2lbs lighter than the same year XT500 - according to my research. Would this conversion mean yet a lighter bike? I would plan on stripping the bike down, tricking the internals up, suspension, the works, and finishing it off as a sort of scrambler, inspired by the original XT500. It would be the bike and ride of my life. I hope to hear good things about how this venture could work. I am young and ambitious, so to fabricate or to not fabricate, your input would be appreciated. Cheers, Daw
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Today I split the cases on my crf450r. I am rebuilding the engine and when I was getting ready to take the bearings out I noticed a small crack on the inside of my case. The crack doesn’t go all the way through, but is still a crack. Is this a big deal, like do I need to replace the case. If so, where could I find them? I am rebuilding this bike, because I started it up one time and it made this screeching metal noise. I thought it was piston at first but in the picture there are some marks on the case that I am pretty sure is what made the noise it was right where the crankshaft is. My idea was to find some aluminum welder to weld the crack back together if that might be a good option.
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I just rebuild my entire 2005 CRF450R engine and need to replace the cam holder assembly. (See image why.) I am wondering if when I take the camshaft out I need to replace the bearing number 25 in the diagram. I bought the new bearing. I am wondering if I can just press it in the cam holder? And switch everything over to the new cam holder. P.S. Sorry if this doesn’t make any sense.
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Hello all, I have an old 99' KTM 50sx adventure that is missing an engine. Per the manual, the engines they used on these older bikes was a Franco Morini S5-GS model engine. That company isn't around anymore and finding anything on those engines is a headache. I'm just trying to find out if there are any aftermarket engines that would fit in the frame. Does anyone know? Thanks in advance! This is what the bike looks like for reference.
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I built a 2005 ttr 125 le but ran into an issue when I tried installing the clutch cover. It wouldn’t sit flush with the engine case so I took off parts to single out the culprit which was the oil pump nut that screws on to the end of the crankshaft(90179-12657-00). I bought a new cover hoping that would help but had the same issue. I took the entire engine apart to make sure I followed every step by the book and still to no avail. Finally, I just said screw it and took the nut to my grinder to file it down. I put the cover back on and it fixed the issue but when I tried to kickstart the bike it was very stiff and made a weird noise on the way down. Not sure how to describe the noise. Like a loud wind up noise if that makes any sense. Didn’t feel like anything was grinding or scraping but I didn’t want to take any chances kickstarting it over and over. I can easily shift into all gears. The clearance on my valves is correct, it’s timed, the tensioner is not too tight not too loose. Everything works just fine without the cover. Any ideas?
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Ok so I have a 2000 ktm 125 sx and need to rebuild the lower, I can only find rebuild kits for 2001 engines will they work?