this is my first post so if this has been said before, my apologies.
i have a zxr400 l1 and im having trouble with the carbs. i think it would be best if i explain in full so here goes...
it normally started without any choke and always smelled a little rich so i guess it must have been?
then the other day when i came back from a trip out i let it idle for a couple of mins, and it started to run a little rough, so i gave it a few revs but instead of the normal pick up it just bogged and stalled and was hesistant for a few seconds and then picked up, but still poorly. took it out again and gave it a good reving and then it was fine again at idle, for a couple of mins at least, when it did it again.
so i investigated and found upon taking it apart that the fuel tap doesnt really work, it flows a little in the off position; also that the float bowls were brimmed.
so, tank off, fuel line off the carb, fuel pump unplugged, started bike and ran for 10 mins perfectly ay idle and revved no probs - on the fuel that was in the carbs.
this led me to beleive the float valves were letting fuel by and overfilling the float bowls, and as there was no fuel supply filling the bowls the problem had gone, not really a long term soloution though!
took the carbs off, checked the floats, floating nicely and freely, blew though the fuel inlet and no air is blowing out when the valves are closed, so no obvious leaks at the float valves.
checked and cleaned up the rest of the carbs and they seem to be in pretty gd condition.
the mixture screws were 2 turns out, so i turned them in by half a turn.
put em back on the bike and problem seemed to have gone untill about 15 mins later when mr problem came back, it cut out and refused to start, so i drained some fuel from the bowls and it started, then cut out again after a few mins.
spark plugs are black.
is there any solution apart from dont let the engine idle and keep it high revving?
your help and patience is appreciated
Andy.
