Maintenance & Technical > KX500 Original
locked up motor. PLEASE HELP!!
KXcam22:
KTMEXC125,
It sounds like you just learned a valuable lesson, one that only comes by what just happend. Never trust the PO. That "recent" oil change can turn out to be last years and that new top end might have never actually happened etc. As a habit when I get a bike I automatically change all fluids including the fuel, prep the filter and generally give it the once over, all the while resisting the temptation to take it for a spin. I am older that you and learned this only because I have done the same as you and got the same result. Keep positive. I'll bet that the damage is not as bad as you expect. It's nice to have you as a member of KXriders. Cam.
KTMEXC125:
cam,
thats exactly what i thought but only after i blew it :lol: this is the second time i've done this! i knew the previous owner and i know that the bike had never had a new top end. its a 2003 but it was due for one. i wish i would of went through the bike before riding it but i was just really eager to ride it. come on now! its a kx500! could ya blame me? :lol: :lol: im gonna go tear into right now. i'll try and post some pics of it so you guys can help me out
KTMEXC125:
i pulled the jug off earlier today and man am i one happy guy now!! :-D the crank and rod are perfect and all the bearings are tight. there are two light scratches in the cylinder and one tiny flake. its going to need to be replated and of course a new piston is in order. where is the best place to get it replated? US chrome or max power? i dont mind paying a little more if the quality is going to be better. on another note my 1999 KTM 125 EXC is for sale so i can fund this project. if you want a quality bike shoot me an email. and here is the craigslist link, http://kansascity.craigslist.org/mcy/1074283525.html my price may be a little high for now but im willing to bargain. i would also consider trading it for an older 500 (im hooked on the power of the k5 now!) i love my ktm and its a riot in the trails but the 500 is king of my garage now and sadly it must go
jdcowboy:
That is a real bummer dude. Are you sru e you found what the cause was? As I recall your friends dad owned the bike, Assuming he is trustworthy ask him about the fuel mixture. If he had the bike for long it is unlikely that he mixed the fuel wrong. THus you may still have a problem that will bite you in the future again. I will say though I have ridden a ton of 2 strokes and that was the only reason i have ever seased piston.
Good job on keeping the bike upright.....
Now what is all this talk about detuning. I love the adrinaline rush that violent hit causes. Don't casterate your machine, just learn throttle control. :-D
KTMEXC125:
well when i drained the gas out of the tank it looked pretty clear. my buddies dad bought the bike in 2004 and always kept up on maintaining it. maybe he made a mistake when he mixed some gas up, or thought some was mixed up in a can and it wasnt. im not really sure. i would guess that it was just wear inside the cylinder, the piston, and the rings. stuff is going to wear out eventually in a motor, ive learned that the hard way many times with many bikes and vehicles. what else would cause a motor to seize up like that? would light scratches in a cylinder that would cause some blow-by cause a motor to lock? it only seized for a little bit then broke free.
and there is one thing bothering me at the moment. i was inspecting my 500 and i noticed that the distance between the crank and the case isnt the same on both sides of the crank :? the crank turns over fine and there is no play between the crank and the case. there is more clearance between the left side than the right. should i be worried?? im guessing that that is a problem and it needs to be centered before i put the top end back on when i get it fixed
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