81 CB900F SS "popping" at idle

[VG2112]

HI,

at idle speed my bike pops, like a miss or something. also when decelerating,
it goes pop pop pop pop....not too bad, but more than i think it should. it has
a VH 4-1 megaphone, k&n pods, and i jetted it as close as i can get it. It
didnt pop a idle before, but after i took it out of storage and redid the carbs
it started doing it.

could it be a vacuum leak, low speed adjustment, or willa set of plugs clear it
up? it runs fine and pulls cleanly to redline. i did sync the carbs

thanks,
vince

[rwj]

Check the air shut off valves. Had to replace three of four on my 83 CB1000c due
to deceleration popping. Cured the problem. They're pretty salty price wise. $25
each from after market supplier....even more from Honda. Takes a couple of hours
too. Only way you'll know is to take the carbs apart and look at them. You may
want to exhaust all other possibilities first. Good luck
Roger

[George Lesho]

Sorry for late reply, often decel popping is the result of low speed
fuel mixture being too lean. The popping can also be caused by a leak
somewhere in the intake system. Check for leaks and consult a service
manual for the position of the low speed or pilot mixture jet. Adjust
the mixture by turning the jet screw and do it in quarter turn
increments....

wiredgeorge ~VROC~2420
VRA 1-20-5A-1500A SCC 66007
Leander, Tx.