Fast idle on new carb

Steve (Tx) · Nov 7, 2012

I put a new Zenith carb on my Ford 2000 4 cylinder. The tractor starts immediately but the idle is super fast, in fact, it is so fast that I cannot increase the rpm"s by increasing the throttle.

As far as I can tell, there are only two adjustment screws; one over the bowl which is probably the air mixture and one at the throttle linkage. With both screws seated or both screws way out or a combo of each, the rpm"s do not slow down.

Any advice is appreciated.

Steve

Royse · Nov 7, 2012

Is the throttle plate in place in the throat and closing when you move the linkage?

Steve (Tx) · Nov 7, 2012

I will take the carb off and check that out.

Thanks

Steve (Tx) · Nov 7, 2012

Royce,

You nailed it. Even though I thought the idle screw was nearly out all the way, it turns out it wasn't even close.

I must have made another 20 complete turns to get the butterfly to seat in the throat. From there, I put the carb back on and made the usual back and forth adjustments. The tractor is running smoothly.

Thanks alot,

Steve

Steve (Tx) · Nov 7, 2012

Royse,

Excuse me for mispelling your name earlier.

Steve

Royse · Nov 7, 2012

Woohoo! I always love those "free" fixes!
Glad you got it going!

Fast idle on new carb

Steve (Tx)

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Royse

Well-known Member

Steve (Tx)

Member

Steve (Tx)

Member

Steve (Tx)

Member

Royse

Well-known Member

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