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[QUOTE="yz250il, post: 1092021, member: 71574"]
i have an hour meter the thing is that i just got the bike and i believe that the guy before me did not do any service to the bike.
since the engine was making a small  whistle sound from the cylinder head i thought ill shim it and so i did. but then the engine would not idle i had to adjust the throttle stop screw to an idle rpm speed of :2700 which is 1000rpm above the recommended speed in the service manual and it was hard to start - i had to start with an open throttle!

and now after 2 hours of riding the engine wont start.

so i turned to the troubleshooting on the service manual and done step by step, cleaned the carburetor and made sure there is fuel reaching the carburetor.

then checked the spark - was OK(new spark plug)

now it is saying:

"Test cylinder compression, if it's low:
                   * valve clearance too small
                   * valve stuck open
                   * worn cylinder and piston rings - could not be cause  i replaced the rings and checked the cylinder and it meets the service limits.

* damaged cylinder head gasket - new one
                   * seized valve
                   * improper valve timing - checked and double checked
                   * faulty decompressor cam"

so now before I'm going to open again the cylinder head and doing any service on the valves i have to check that.

by the way, the bike wont start with the kick starter but when i bump started it there was a big backfire from the exhaust

have any idea whats wrong???? please?!?!

Thanks Nativ :bang:
[/QUOTE]

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