Zenith carb main jets

[Tony Sha]

I have a Zenith #11033 on my Cockshutt 570, Hercules GO298. It gets lean at the end of a pull and my torque goes in the toilet. Can it be converted to a adjustable main jet or where can I buy a bigger jet? It has a #30 in it now.

 

[CGpuller]

Numbered drill bits are your friend!

 

[rustyfarmall]

(quoted from post at 10:52:01 09/11/11) I have a Zenith #11033 on my Cockshutt 570, Hercules GO298. It gets lean at the end of a pull and my torque goes in the toilet. Can it be converted to a adjustable main jet or where can I buy a bigger jet? It has a #30 in it now.

An adjustable screw is available for the Zenith.

 

[Tony Sha]

Where???? I've spent hours goggleing Zenith and have called several supposed carb experts (Denny's) and even my local tractor parts dealer with zero results!!!!!

 

[Tony Sha]

I'm afraid to do that because if I mess up the only jet I have I don't have a "starting point" It runs really sweet now. Also the jet is not a "pill" shape. It is closer to the shape of a 22 rifle shell and is tapered from inlet to outlet. It is a #42 drill size inlet and a #55 outlet. I'm afraid if I drill it I will mess up the flow and cause a turbulance. I've heard that a drilled jet can acually flow less bacause of this. My goal is to get a tiny bit more torque under heavy load. On my very first pull I missed 1st place by 6ft.

 

[Tony Sha]

To see a video of my 1st pull go to : "Oregon Tractor Pullers' and click on "Heritage Fair 2011" videos. This was my 1st time out and the engine had less than 2hrs. run time on it. I pull in the pure stock 3mph. class

 

[BenThere]

Call Motec @ 765-963-6628

 

[billet-boy]

(quoted from post at 17:12:18 09/12/11) Call Motec @ 765-963-6628

I just got mine back from Motec very reasonably priced

 

[rustyfarmall]

(quoted from post at 12:31:37 09/12/11) Where???? I've spent hours goggleing Zenith and have called several supposed carb experts (Denny's) and even my local tractor parts dealer with zero results!!!!!

http://rustyfarmall.ecrater.com/p/3753263/zenith-carburetor-fuel-adjusting-needle

 

[BenThere]

Nice part, buy it won"t fit the bigger Zenith carbs.
Call Motec for the right part.

 

[rustyfarmall]

(quoted from post at 10:18:27 09/13/11) Nice part, buy it won"t fit the bigger Zenith carbs.
Call Motec for the right part.

It is the same part that fits a Massey 44 or 55 Zenith carburetor.

 

[BenThere]

The carb he has is bigger than a 44 or 55. The adjustment neddle that you show is to small. Motec has the one you need.

 

[Charles McNelly]

Have you ever thought about taking a torch tip cleaner and just do a little filing? Just thinking......