None fazer Question (xj900f Igniter box)

[His Dudeness]

Ok chaps got the xj to run quite well now my only gripe is when  i release the throttle it is slow to let off the gas .the carb snaps back nicely -throttle grip and cables all snap back as they should --bike ticks over as it should--bit stumped now --any ideas please --?

The chap below had a similar problem a few weeks ago. Turned out the slides in his carbs were returning slowly so the idle was dropping slowly. If the slides return slowly it holds the jet needle up out of the emulsion tube so fuel can flow through the main jet when you don't want it too. I'd try taking the diaphragms out, clean the slides and the carb where the slides move, check the return springs. Then put it back together making sure the diaphragms are seated correctly.

ARF...finally sorted my carb issues... :rollin
First I had a bogging down while tipping along at low revs...open the throttle, and nothing ... for a few secs...then start to accelerate away.... turns out to be a clogged pilot jet...makes sense, since pilot jet is helping at low revs, not just idling, and wasn't working properly, but once main jet kicks in off we go.
Second problem...revs won't fall back to idle when throttle is shut off...NOT pilot jet, although some experts suggest that running too rich causes this problem. I went down that road and tried adjusting pilot screws...no difference except lumpy idling.
Put pilot screws back to factory setting.
NOT throttle cable, i fitted a new one and made sure it was snapping back all the way. NOT a partly open choke circuit.
Other expert points out that shutting the throttle should drop all needles into main jets and close them SMARTLY. If one needle is not falling for some reason (diaphragm damaged/not seated correctly or some tiny obstruction) then there will be a delay in revs falling.
I took off the carbs, and without dismantling them completely opened the tops and made sure the diaphragms were seated correctly and the sliders were working smoothly....BINGO..! Blip the throttle and she revs up and falls back like a good FZS should...took it for a burn and experienced bliss of perfect throttle response....this video was a big help - http://www.youtube.com/watch?v=IBFq9nHVmks&t=62s
thanks for the comments and advice