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simongpz
28-06-14, 10:16 PM
ok this has got me stumped when the engine is cold on my 1991 gsxf750 it will run at idle ok but when hot it has a intermitant fault
most of the time it will drop onto idle speed when I pull up at a junction
but about 3 times out of ten it will sit at 2500rpm when I pull up unless I try to stall the engine and then the revs will drop to tickover engine runs fine the rest of thje tme

Nano
28-06-14, 10:50 PM
sounds like a sticky pilot valve or idle jet. Make sure the throttle cable is not snagging.

try this.
http://www.mtsac.edu/~cliff/storage/gs/understanding_carbs.pdf

Rabb
07-07-14, 12:09 AM
Sounds like a cable problem to me.
Check your throttle cables for tensions.
Does the bike have a dual cable for acceleration and return?
Have the original cables ever been replaced? 1991?

Conehead
07-07-14, 12:34 PM
As above. Check cables for kinks, might be worth giving them a good oiling and cleaning your carbs wouldnt go amiss.