Idling @ 8000 rpm

[jonbuoy]

There is quite a bit of play at the grip, problem is I had the bike apart so the throttle adjustment has changed. However I have checked that the butterflies are fully closed with the throttle shut, which they are. Is this what you mean?

If the slides are shut then it can't be being fouled by the hose clip, are you sure they are shut completely? The idle screw is backed off completely? they don't have to be cracked open much. If you have them off you can check if you shine a torch in a darkened room - shine it in from the engine inlet side through to the airfilter side - might need to lift the slide to get the torch in. I "rough" balanced my carbs this way before I fitted them, fairly accurate - get the same amount of light from each carb gets you pretty close.

[MSTRS:Me]

There is quite a bit of play at the grip, problem is I had the bike apart so the throttle adjustment has changed. However I have checked that the butterflies are fully closed with the throttle shut, which they are. Is this what you mean?

It is. If the excess play wasn't there before, then I'd be questioning the butterflies being FULLY closed. It doesn't take a lot to run an unloaded engine at 8000rpm.
A similar effect could be caused by the slides not being bottomed out either. That is possibly something you'd have to look at with the engine going, however.

[cbfb]

If the slides are shut then it can't be being fouled by the hose clip, are you sure they are shut completely? The idle screw is backed off completely? they don't have to be cracked open much. If you have them off you can check if you shine a torch in a darkened room - shine it in from the engine inlet side through to the airfilter side - might need to lift the slide to get the torch in. I "rough" balanced my carbs this way before I fitted them, fairly accurate - get the same amount of light from each carb gets you pretty close.

Idle screw is completely out, no way that is affecting anything.

Slides are shut in as much as they reach the bottom of the groove they slide in, although they don't reach right to the bottom of the manifold, there is a slight gap (see attached pic, not my carbs found the pic on the internet but similar). I think that's right, what do you reckon?

[Katman]

If the slides are shut then it can't be being fouled by the hose clip,

You're getting confused between the slides and the butterflies. They're two separate things.

[cbfb]

It is. If the excess play wasn't there before, then I'd be questioning the butterflies being FULLY closed. It doesn't take a lot to run an unloaded engine at 8000rpm.
A similar effect could be caused by the slides not being bottomed out either. That is possibly something you'd have to look at with the engine going, however.

OK I will double-check this tonight, won't hurt to check again but I am fairly certain they were fully closed.

[Katman]

(see attached pic, not my carbs found the pic on the internet but similar)

They are slide carbs not CV carbs.

[TimeOut]

Is there supposed to be a spring above the slide? If so and it's not there vacuum could suck the slide up.

Just a thought

[cbfb]

They are slide carbs not CV carbs.

Sorry man I'm confusing things even further eh. Was just trying to show the gap between the bottom of the slide and the manifold.

Is there supposed to be a spring above the slide? If so and it's not there vacuum could suck the slide up.

Just a thought

From memory no I don't think there shuld be a spring above the slide, can't see one on parts diag anyway.

[Katman]

If you now have excessive freeplay at the throttle that you didn't have before it's most likely because the throttle butterflies are not being allowed to fully close.

[cbfb]

If you now have excessive freeplay at the throttle that you didn't have before it's most likely because the throttle butterflies are not being allowed to fully close.

Nah it's cause I had to loosen the throttle adjuster to get the cable end out, it was an absolute bastard to release. Need to tighten the throttle up once the bike is running normally.

[MSTRS:Me]

From memory no I don't think there shuld be a spring above the slide, can't see one on parts diag anyway.

Hmmmm....

[jonbuoy]

You're getting confused between the slides and the butterflies. They're two separate things.

No only terminology, I meant the slide/butterfly controlled by the throttle cable - not the internal slide.

CBFB good luck with the fix, sure you will suss it out in the end.

[Katman]

From memory no I don't think there shuld be a spring above the slide, can't see one on parts diag anyway.

Number 22.

[Katman]

No only terminology, I meant the slide/butterfly controlled by the throttle cable - not the internal slide.

On a slide carb the throttle is mechanically connected to the slide. There is no throttle butterfly.

On a CV carb the throttle is mechanically connected to the throttle butterflies.

[cbfb]

Hmmmm....

Number 22.

Twice in one day, sorry you're right, was a while since I did the carbs. I was pretty methodical when I did them so am confident they have gone back right but will check tonight against the parts diag.