Plenum butterfly adjustment

[Meatball]

My throttle butterfly is slightly sticking open after a blip on the gas, it holds the revs at 1200rpm it then realeses after another blip back to 850 rpm -

What could cause this?

[Ballistic Banana]

Carbon build up. A very gentle cleaning may sort it.

BB

[Meatball]

Ballistic Banana said:

Carbon build up. A very gentle cleaning may sort it.

BB

i did try that one i think its knocked out of position?

[Ballistic Banana]

Have you tried blipping it at the throttle linkage to see if it still sticks? maybe the cable is sticking?

BB

[Chimjunkie]

Is it a 72mm modded plenum? If so may be worth checking out the seating of the butterfly.

[Meatball]

Chimjunkie said:

Is it a 72mm modded plenum? If so may be worth checking out the seating of the butterfly.

It is a 72mm what do you mean seating? the spindle position

Edited by Meatball on Sunday 14th September 22:43

[Johno]

If it's the butterfly and not the throttle cable/pedal/carpet . . then I'd loosen the 2 screws that hold the butterfly to the spindle and the flick the spindle like your clicking your fingers until it sits better and then do up the 2 screws remembering to re-spread them to lock them in place.

I's still reckon on cable adjustment etc before getting to this as I've spent ages trying to get a butterfly sitting right on mine after I took it apart and wished I'd never done, a right pain but I had to do it after being a total numpty and snapping part of the spindle. Don't ask, and yes it isn't easy to geta spindle although JE still stocks them having bought the factory original parts.

[Johno]

Meatball said:

Chimjunkie said:

Is it a 72mm modded plenum? If so may be worth checking out the seating of the butterfly.

It is a 72mm what do you mean seating? the spindle position

Edited by Meatball on Sunday 14th September 22:43

The seating of the butterfly is where it rests naturally when closed. It is held in this position by the return spring. The breather system can mean that you get a build up of carbon between the edges of the butterfly and the walls of the throttle housing and when it is at rest/seated it get's sticky.

The seated/closed position can be adjusted by the grubber screw, but I wouldn't go there yet, check the other suggestions on the thread.

[Meatball]

Johno said:

Meatball said:

Chimjunkie said:

Is it a 72mm modded plenum? If so may be worth checking out the seating of the butterfly.

It is a 72mm what do you mean seating? the spindle position

Edited by Meatball on Sunday 14th September 22:43

The seating of the butterfly is where it rests naturally when closed. It is held in this position by the return spring. The breather system can mean that you get a build up of carbon between the edges of the butterfly and the walls of the throttle housing and when it is at rest/seated it get's sticky.

The seated/closed position can be adjusted by the grubber screw, but I wouldn't go there yet, check the other suggestions on the thread.

Johno thanks for your input,Ive got 3 springs on mine 1 wrapped around the spindle and 2 to return the cable (i think) is this correct? as ive seen some with only 2 springs. i think i`ll have a better look over the weekend.

[Johno]

3 springs is correct. Many have one of the cable springs removed to loighten thye throttle pedal and improve throttle response allegedly. Ii keep the 3 as I find the pedal weight fine.

[Badmutha]

2 springs on the throttle cable = TVR traction control!!