RE: anyone care to read my spark plugs
as long as you keep your fuel mix consistent... i would say 100 is acceptable ... i tune with the engine on, i adapt a socket head screw on my highend so the driver stays put.. i rev to WOT and and lean out high end till i hear a slight drop in rpm, then richen it till it peaks again, then richen it a hair more than 1/8th of a turn