84 xr250r help

Joined
Jun 9, 2020
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#1
Hi. I need help with my 84 Honda xr250r. Broke off an intake valve so I bought a used head. Timed it with the cam lobes facing down, the timing marks level with the head at tdc on the flywheel. My issue is that when I put the valve head/cover on there's no compression (very easy to push the kickstart) but if the valve head/cover is off then the compression is normal ( meaning it's hard to push the kickstart). What would cause this?
 
Joined
Jul 27, 1999
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#2
Something in the cam cover is pushing one of the valves open. Time to retrace your assembly steps using the service manual to fund the culprit.