Maintenance & Technical > KX500 Original

Cracked cylinder

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ktmdude:
So I striped the top end down on my uncles 91 k5 today. It had boiled over and lost compression during a race and would not restart. Once I got it apart I found that the edge of the piston had melted, some of it melted to the cylinder, but I do not see or feel any gouges on it. When I turned over the cylinder to remove the power valve I saw cracks on the back side of the sleeve where it connects to out side of the cylinder. Not real sure how to explain, but hear goes, on the sides, not front or back of the cylinder there is two(one on either side) "braces" that support the sleeve. They are both cracked where they hold the sleeve. I also found cracks in the intake on the two vertical bars at the sleeve. Can I have it welded or is it a paper weight? Does anyone here fix this type of stuff? Or does anyone have a good cylinder to sell me? What would you guys do?

FPMXer:
Unless the cracked parts are moving it'll be fine. I had a Suzuki LT500 that had cracks in the intake and near the same areas you speak of. I inquired about them and was told it'll be fine. I ran the snot out of it that way and didn't blow the motor.

jonny500:
some photos would be usfull. mark the cracks with a marker pen

crazyolbastard:
sorry to hear bout that ktm dude.
I`m sure you will find the best fix fix for the problem.

kaw rider:
I have cylinders and heads for sale. let me know if you are interested.

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