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I've been puzzled for months about why I couldn't get the mixture lean enough. SU H6, standard jets and needles. Regardless of how high up I screw the adjusting nuts, the engine ran rich. Warm idle always lumpy, plugs always sooty; slight dark smoke on acceleration.
So this afternoon I cleaned the plugs, checked the gap, and lowered the needles so the shoulder is about 1/16" below the bottom of the piston.
Started up, engine is idling faster and smoother.
Went for a 50 mile drive; no loss of power, good smooth acceleration as well as idle. Came home and checked the plugs. Slight grey coating on the tips - absolutely no soot.
If at first you don't succeed ...
Tom
So this afternoon I cleaned the plugs, checked the gap, and lowered the needles so the shoulder is about 1/16" below the bottom of the piston.
Started up, engine is idling faster and smoother.
Went for a 50 mile drive; no loss of power, good smooth acceleration as well as idle. Came home and checked the plugs. Slight grey coating on the tips - absolutely no soot.
If at first you don't succeed ...
Tom