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Talk of 2' SUs 140-160

posted by  someone claiming to be Rhys on  Sun Feb 29 05:59 CST 2004 [RELATED]

Perhaps a valve float problem John? From your troubleshooting so far, I think the carb can be eliminated. Any misfire detected - were you monitoring the ignition on a scope?
The piston drop, if the carb is mechanically eliminated from that problem, is simply an indication of airflow decrease.
Even a weak fuel pump could cause this. I have noticed over the years that one bowl always empties before another and that would drop power, produce the lean and lower the piston too.
Just some thoughts anyways.
Rhys





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