I had lower compression on #1 (on a 140, 120 psi vs 150 psi on 2,3, & 4) until I reamed the plug hole threads (18mm) so the pressure gauge fitting could seat properly. If the compression is really that low combustion will be poor and the cylinders will probably get gummed up. I would ream the threads and use anti sieze on the plug/fitting threads.
My manual says set 0.014 in. on intake valves, and 0.020 on exhaust valves. I've heard others say set all at 0.014 in.? I use the manual settings and haven't had a problem. Isn't there more danger of burning exhaust valves if they are set at 0.014 in.?
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