well i finished my engine rebuild a few weeks ago (1988 domi) thanks to every one here. its been running well but im having trouble with it being too rich.

its got noisy race pipes, a KandN filter(cleaned and re oiled) and a chopped off snorkel thing.

at first it had a 160 main jet and 50 idle jet.
ive since got it down to 155 main and 45 idle.

i've played around with the adjustment screw and find that the idle speed keeps increasing as i turn it clockwise until i cant turn it any more.

i've cleaned out the carb a few times, checked float height, replaced the float valve and needle seat with good condition second hand ones.

i've also noticed some kind of smoke coming out of the air box which is a recent development since putting the 155 jet in.

the choke cable has been disconnected at the handlebar controls to ensure its not on, the threaded part at the carb end has been stripped but still screws in, would this somehow change the pressure some where affecting the choke? i've tried sealing it a bit with silicone.

could the richness be caused by the rebuild? i think i've heard that somewhere. It must have been running for years with a 160 main in so it seems mad that its rich even with a 155.

i've just ordered a new air filter as i read on my k and n cleaning/oiling kit that the fibers can tighten in some circumstances.

it doesn't run too badly but there's lots of soot round the exhaust outlets and on the spark plug.

today i found oil in the air box drain tube, it was red (same colour as the air filter oil). could it be that i over oiled the filter?

please let me know if anyone has any ideas about this, it would be much appreciated.