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  #1  
Old 08-26-2007, 02:43 PM
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Usflag '00 yz 250 crank problems

my little brother bought a yz 250 and three hours into his first ride on the used bike he said that a lot of smoke came out of the pipe and then the piston siezed (or at least it wouldn't kick over). I pulled the top end off and the piston and top end look great, however, there was metal chips that looked copper all through the crank. one of them was wedged in there causing the crank to sieze. Also the the plastic part on the inside of the crank looked melted and had big gashes where the rod connects. i imagine this was all due to a bearing going bad and hope that i can just put a new crank kit in it and be ok, but i'm not well versed in small gas engines, especially 2 stroke. i would apprieciate any expert insight or experience to this problem. (PS- if there are any tricks or tips to take into consideration i would love to here them, i have yet to take the bottom end off and split the case because i'm worried about springs and gears and whatever else they put in these things flying all over.) thank you.
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Old 08-26-2007, 04:27 PM
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Default Re: '00 yz 250 crank problems

the melted part probably just melted due to overheating the same thing happened to my 04 yz 125 and the problem was the yamalube was heating up to much and melted the plastic so i put a new crank kit in and switched to Amsoil and its been fine since
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Old 08-27-2007, 12:04 AM
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Default Re: '00 yz 250 crank problems

Quote:
Originally Posted by mxracer18 View Post
the problem was the yamalube was heating up to much and melted the plastic so i put a new crank kit in and switched to Amsoil and its been fine since


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Old 08-27-2007, 02:36 AM
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Default Re: '00 yz 250 crank problems

yeah, it is the amsoil that fixed it.
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Old 08-27-2007, 06:58 AM
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Default Re: '00 yz 250 crank problems

I just had the exact same thing happen on my yz 125. I have a 99 and was told that sometimes these cranks just go. It was the original so it got 7-8yrs of riding on it. After that I switched from 40:1 to 32:1 on my premix and I think I will switch to a better lube on my next quart.
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Old 09-02-2007, 01:24 AM
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Default Re: '00 yz 250 crank problems

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Originally Posted by ossagp1 View Post
yeah, it is the amsoil that fixed it.
I replaced the crank
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