From:Dave Molnar
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 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.

Thanks a lot Dave
I find out in
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????

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.

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