Yes likely lean on the low end... Maybe the regulator is a little lean too.


Regulator is set at 4000rpm....surging up and down is lean, and slowly loading up is rich. Regulator works the same as the HS needle In (CW) is lean and out (CCW)is Rich.


Then drop it into a low idle....2000rpm or as close as you can get, but try to get it less than 2400 at least...goal is 2000rpm....If it drops to a higher rpm then will slowly settle to the lower rpm its lean. If it drops to the 2000rpm right away and then surges up and down its lean. If it drops to an idle then slowly loads up and quits then its rich. The air bleed screw on the carb is OUT (CCW) for Leaner and IN (CW) for richer.

A tell tail sign of too lean on the regulator or low end is a sudden quit on throttle up. a ZiiiiiiiiiiP! and then it catches and goes or just dies. If its rich on the low end or regulator is will chuuuuug-chuggg-chuc-chug-chug and eventually clean out and throttle up. rarely will it stumble on a throttle up when its rich...it will just take a while to clean out. The quick stumble is a sign of too lean.

Troy Newman
Team YS