From:Dave Molnar e-mail:dave@impax.on.ca
Subject:RE: RE: RE: Sizes of carb jets ;Float level? Date:Tue Jul 17 08:18:04 2012
Response to:4190
Once apon a time I had a rich condition with my T4X too.

"A" is the idle jet and also allows idle air adjustment I believe. It seems to me that has a 35 on it but I have to check. I have a couple spares of these.

"B" is the main jet. It should be a #20. I could try to see what wire size drill fits it. Originally I had a twenty in mine but found the hole to be too big. I think someone might have tried to modify it for whatever reason. I finally compared it to another #20 and saw a big difference. Once I changed it out the rich condition was corrected.

"C" is the compensating jet. It should also be #20.

I read the decription and explanation of the function of the Zenith compensating principal (a few times...) in the oldcarburator.com site. I thought it was a very clever design and no moving parts. That original Zenith information is even entertaining to go over whith the little guys and the straws etc.! I knew mine wasn't right. Once I had it working right, I was very impressed with how good it worked in all conditions. There are NO dead spots which some guys talk about. It accenlerates smoothly and with-out a cough (unless timing is retarded - when its supposed to) and idles perfect.

I think the hardest part is to mainain a good float level. the design of the float needle and "coo-coo clock" fiddly levers set-up is not what I would prefer but it is posible to get it all working right with some patience. I was trying to come up with an alternate float set-up but It would be a rather tough retro-fit in there.

I have a few carbs I'm working on for cannonball guys. You can email me if you need more help.

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Thanks a lot Dave
I find out in www.old-carburator.com
that i need a 20 Size idle jet mine is a 35 thats whi it runs to fat in the idle
do you know where i get a 20????

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I believe they are #20(s)

Good luck with the float level! That seems to be a very fiddly thing. It helps a lot to have a viton tip on the needle. Mine drips once in a while when the bike is leaning on the Tracey Snap Jack with the fuel open. My T4X works great at all RPMs and all conditions.

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Can sombody tell me the correct sizes of the idle jet and compensationjet and mainjet for my 1924 deluxe??
i have the correct T4X Zenith on it i the ealy version where the idle jet is screwed in and out also the correct Floatlevel could help
thanks a lot in front Andy