Initial Install of Weber DCOE 40. Revs high on its own.

[RayRay]

Hi guys,

 

A few days ago I managed to install my triples I brought off RB30x.

When I turnover the car, it incredibly starts fine but after a second or two for unknown reason to me it self revs as if its on WOT until it reaches 3k! Which I turn off ignition but it does sound like it wont stop going higher!

 

What could be the reason to this? I would have thought they would either run rough or idle.

 

Some things i need to mention/confess though.

-I brought them early on this year around Feb/March so they have been sitting around for a while.

-Cannon manifold is cracked but has been mended.

-I have not rebuilt these prior to installing them, though have been externally steam cleaned :S

-The mixture screws are seated then turned 2 1/2 turns

- i don't have information on the specs of the venturi, jets etc.

- the butterfly's appear to open close the same.

- Searched around for tuning, but nothing mentions high revving on its own

 

Heh I should have been more smart prior to installing this and have them cleaned inside and out to get rid of the fuel. Its probably gummed up something inside but i was so excited and had time on my hand.

 

Cheers

Ray.

[Zedman240®]

Have you checked for air leaks around the manifold?

[Riceburner]

You can use crc or carby cleaner to check for air leaks when it's running, just spray manifold and flanges with it, if it slows theres your leak. Also might be silly but maybe back idle speed srews down..

[RB30X]

Especially if you've had the manifold repaired, it might not be true against the head. I had a similar problem when I put them on at first, not as high rpm though, and it ended up being a vacuum leak. Spray some brakleen or start ya bastard over the inlet manifold when running and see if rpm increases.

 

Failing that did you set up the linkages properly after the manifold was fixed. You'll need a seperate spring on the main linkage rod too, do rely on the springs in the carbs and the throttle alone to keep the throttle blades shut.

[Scoota G]

It's themky Throttle shaft bolts again.