camshaft confusion

2 replies to this topic
  • ltdan

Posted May 11, 2006 - 09:21 AM


Hey- my 88 xr600 recently quit running on me. A rattle in the top end (i think) developed and it died, and when i tried starting it agian it would run for a few seconds with the rattle then die again, and now it wont start up. I took the engine out, and took the head cover off and took the camshaft out. The plate (part # 6 on this diagram OEM+%28Stock%29+Parts~dept_type_id~2~model_dept_year~1988~model_dept_mfr~Honda~model_dept_id~375278~model_dept_name~XR600R.asp' class='bbc_url' title='External link' rel='nofollow external'>
between the decompression cam and the first cam moves back and forth very easily. Think mabye this is the source of my rattle and troubles?

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  • cleonard

Posted May 11, 2006 - 09:30 AM


I think that's part of the anti-kickback compression release, and mine was rather loose as well. I don't think that is the issue.

If your bike has a lot of hours, I'd be concerned about the health of the valves and the cam chain tensioner. Were all the valve clearances within spec when you took the engine out?

  • davelj

Posted May 13, 2006 - 01:00 AM


My 89 xr600 has some movement in the decompressor cam.

I had a rattle (thought it was the top end) - ended up being worn conrod bearings - piston will rock side to side if one or both are worn.

I would check the valve clearances and cam chain tensioner first (as already suggested) - if the cam chain slips enough, it will never start (happened to me once because of a broken tensioner spring)

all the best


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