Post by joebob on Aug 30, 2018 20:07:05 GMT -5
2013 taotao 150cc 4 stroke ...
as per title, the idle moves up and down within a limited range all on it's own.
bogs down a bit when giving it throttle and on full throttle it doesn't quite rev freely.
carb is squeaky clean inside and out.
air filter is new with less than 10 miles on it.
cannot find a vacuum leak anywhere.
fuel is fresh.
enricher extends as it warms up but the engine does not go into a fast idle on start-up; just the opposite, it idles slowly when cold, slowly picks up speed as it warms up, then goes into its up/down idle routine.
as a last resort i took the brass cover off the idle mixture screw and removed the screw. it is clean and it's bore looks clean but i didnt spray any carb cleaner in there. re-installed carb, then tried adjusting the idle MIXTURE screw in and out. no difference ... in fact, the engine still idled even though i bottomed the screw out; can that be right ? also, even though i cleaned and cleaned, i am not 100% sure that the lengthwise bore of the idle JET screw is ok. it's hard to tell because the bore is so tiny, and my eyes are getting old, but there seems to be a burr inside there. could be an optical illusion though. a strand of wire from a wire brush will go through, but nothing larger.
i can remove carb and try cleaning the bore of the idle MIXTURE screw with carb cleaner and compressed air, which i should have done 1st time around, but beyond that i am running out of ideas. could go the new carb route i suppose but this scooter only has 3400km (2500mi.) on it !
as per title, the idle moves up and down within a limited range all on it's own.
bogs down a bit when giving it throttle and on full throttle it doesn't quite rev freely.
carb is squeaky clean inside and out.
air filter is new with less than 10 miles on it.
cannot find a vacuum leak anywhere.
fuel is fresh.
enricher extends as it warms up but the engine does not go into a fast idle on start-up; just the opposite, it idles slowly when cold, slowly picks up speed as it warms up, then goes into its up/down idle routine.
as a last resort i took the brass cover off the idle mixture screw and removed the screw. it is clean and it's bore looks clean but i didnt spray any carb cleaner in there. re-installed carb, then tried adjusting the idle MIXTURE screw in and out. no difference ... in fact, the engine still idled even though i bottomed the screw out; can that be right ? also, even though i cleaned and cleaned, i am not 100% sure that the lengthwise bore of the idle JET screw is ok. it's hard to tell because the bore is so tiny, and my eyes are getting old, but there seems to be a burr inside there. could be an optical illusion though. a strand of wire from a wire brush will go through, but nothing larger.
i can remove carb and try cleaning the bore of the idle MIXTURE screw with carb cleaner and compressed air, which i should have done 1st time around, but beyond that i am running out of ideas. could go the new carb route i suppose but this scooter only has 3400km (2500mi.) on it !
