Slow Returning to Idle

[Ben_OB1]

Hi Rascal,

Your problem is caused by slack/sticking in the linkages. The linkages are not hard coupled, and one (or more) throttles can lag (close slowly) when you shut the throttle. Pull the carbies off and give the linkages a good lube - WD40 should do the job.

You will notice a massive improvement in throttle response, power delivery and rideability once this is done. Interestingly a good clean of the carbs is usually the cause of this problem!

Ben.

[Rascal]

Thanks, right I'll get stuck in tonight and lube the linkages then check my throttle snaps shut when Ive finished.

Shouldn't do any harm to balance them once my gauge arrives as well.

I'll post another video of the results once done.

Cheers

[Icemaestro]

My throttle snaps shut just fine and has been balanced...is it likely to be blocked pilot jets then?

[bikemonkey]

Air leak.

[Icemaestro]

Both op and I have new carb rubbers :-) my carbs are definitely seated

[bikemonkey]

Fecked if I know then!

Have fun

[Icemaestro]

Actually in saying that, when riding and pulling in the clutch the slow return to idle is greater, would that be due to air leak, or just down to the increased air flow coming into the air box? - sounds to me as it's too lean when relying on the pilot jet - so either blocked or adjust pilot screw settings more? How many turns to richen it slightly from stock?

[Ben_OB1]

Actually in saying that, when riding and pulling in the clutch the slow return to idle is greater

I still reckon you've got a lazy linkage. This is exactly what mine was doing. Did you notice that one cylinder took longer to return to a stable level when you did the carby balance? Did you use a set of vacuum gauges or rely on the "drill bit" method.

When I balanced mine it was cylinder #4 that was lazy in returning, vacuum was higher than the other 3 cylinders until it eventually stabilised. It meant that idle speed was high, but cylinder #4 was working harder than the others. Caused the bike to bog down when accelerating from traffic lights and was a general pain in the backside whenever throttling off. A good squirt of WD40 on the carb throttle shaft, springs, linkage connection made a big difference.

Unless you've got a vacuum leak in the diaphragm of one of your slides?? otherwise, you're just going to have to systemmatically check and adjust everything until you find the culprit.

Good luck!

Ben.

[Icemaestro]

I may have had someone else balance mine - done by me with a drill bit to get there then done without me. Will give it a go - Is there any way I can check? I have had issues with number 3 (right rear)not firing at idle sometimes...

[Neosophist]

hanging revs retuning to idle is usually sign of being lean.

Thats often leaking carb rubbers, did you fit new ones?