hello-
first post here.
i own a ms-310 that i've used for years and love. then i started reading on here and wanted more power. yes, i know i should just buy a pro saw, but that isn't in the cards for now.
i bought a 390 engine and put it in my 310 saw. got the complete sealed engine from baileys. i have also drilled out the exhaust. i put (one) 1/2" hole and (two) 3/16" holes in the small plate right outside the spark screen. screen is still there and in good shape.
i took out the plug on the "H" screw to get more adjustment and backed it out ~1.5 turns. the plastic plug seems to have no other use than a screw extension with limiters, so i never put it back in. "L" screw backed out approx 1/2 turn. new 85 octane gas with echo brand two stroke oil mixed a bit stiffer than 50:1 for the first tank. spark plug looks not black but not brown, somewhere in between. (after swap and screw adjustments)
i bolted it back together and she fired right up. but would not hold an idle. i figured this would be the case as a larger engine would take more fuel to idle than a smaller one. so i slowly started backing out the idle screw. left loosey gives more fuel correct? i got it to almost idle after backing it out a full 5 turns. this seems excessive to me but maybe not?
any thoughts on why my saw won't hold an idle? i did add the 1/2" hole to the exhaust while i was engine swapping, so maybe it's too much? i could weld it partially shut...
adam
first post here.
i own a ms-310 that i've used for years and love. then i started reading on here and wanted more power. yes, i know i should just buy a pro saw, but that isn't in the cards for now.
i bought a 390 engine and put it in my 310 saw. got the complete sealed engine from baileys. i have also drilled out the exhaust. i put (one) 1/2" hole and (two) 3/16" holes in the small plate right outside the spark screen. screen is still there and in good shape.
i took out the plug on the "H" screw to get more adjustment and backed it out ~1.5 turns. the plastic plug seems to have no other use than a screw extension with limiters, so i never put it back in. "L" screw backed out approx 1/2 turn. new 85 octane gas with echo brand two stroke oil mixed a bit stiffer than 50:1 for the first tank. spark plug looks not black but not brown, somewhere in between. (after swap and screw adjustments)
i bolted it back together and she fired right up. but would not hold an idle. i figured this would be the case as a larger engine would take more fuel to idle than a smaller one. so i slowly started backing out the idle screw. left loosey gives more fuel correct? i got it to almost idle after backing it out a full 5 turns. this seems excessive to me but maybe not?
any thoughts on why my saw won't hold an idle? i did add the 1/2" hole to the exhaust while i was engine swapping, so maybe it's too much? i could weld it partially shut...
adam