2013 kxf 250 Cam chain loose then tight

gregmx104
Edited Date/Time 2/16/2016 5:40pm
We went to adjust the valve clearances but when it all got put back together the cam chain was loose. Not completely loose but loose enough because the cam chain tensioner didnt take up all the slack. Ive tried a different spring in the tensioner but still the same result. So we manually set the tensioner to take up the slack and tighten the cam chain but as we rotated the engine the chain become slack then tight. We have also had a look at the lower sprocket to see if the chain was still attached and it seemed all good.
Any ideas?
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Paw Paw 271
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Paw Paw 271 2/16/2016 4:50am
2/16/2016 4:50am
Worn out cam chain. Replace it.

Paw Paw
gregmx104 2/16/2016 3:13pm
2/16/2016 3:13pm
Would a worn cam chain effect valve clearances? We only got 4 hours on the intake valves before the clearance completely closed up again. We shimmed it back to spec 4 hours ago and the exhaust clearances havent moved but the intake moved a lot.
bf884
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bf884 2/16/2016 4:48pm
2/16/2016 4:48pm
check your guides as well
Paw Paw 271
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Paw Paw 271 2/16/2016 5:21pm
2/16/2016 5:21pm
Your valves are worn and need replacing as well as having the valve seats cut or replaced. Do this before the intake valves break and trash the engine.
The worn cam chain will not have an effect on valve clearance, but will effect valve timing.

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gregmx104 2/16/2016 5:40pm
2/16/2016 5:40pm
Thanks heaps. That will give me something to work on

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