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Ok got out my 68 Norton Atlas and at the end of last season it would run on only the left cylinder. The right pipe had white ,unburned fuel smoke. I figured it was due for points or at least adjustment. Just put in new points, condenser and sparking plugs. Still runs on Left cylinder only. Removed the carb bowl everything clean, check valves ,clearances ok.. Sooo check compression on left side first, yes I did open throttle completely and got 110 psi. The right not so good 75psi.. I hate to pull it apart for what I might see. So I guess I'll pull the head and touch up the valves.. At what point ,psi, will the fuel mixture not ignite.? I know alot of the real old stuff had 6.5- 7.5 ratio and ran

[QUOTE="mean gene, post: 533119, member: 12436"] Ok got out my 68 Norton Atlas and at the end of last season it would run on only the left cylinder. The right pipe had white ,unburned fuel smoke. I figured it was due for points or at least adjustment. Just put in new points, condenser and sparking plugs. Still runs on Left cylinder only. Removed the carb bowl everything clean, check valves ,clearances ok.. Sooo check compression on left side first, yes I did open throttle completely and got 110 psi. The right not so good 75psi.. I hate to pull it apart for what I might see. So I guess I'll pull the head and touch up the valves.. At what point ,psi, will the fuel mixture not ignite.? I know alot of the real old stuff had 6.5- 7.5 ratio and ran [/QUOTE]