resizing venturis hard work
 

Just to let you guys know. It takes about two hours to resize your venturi's if you own Zeniths. I had the stock ones and just borrowed a bicycle seat post reamer from a friends shop and cut them open to 30mm from 27mm.

1st you have to use your dremmel tool to get close. Then you adjust the reamer so it barely fits, cut them all down, resize the reamer a little bigger and do it again and again until you get to your size.

Next you have to sand it all smooth with a few different sizes of paper.

Something to do when you get really board. But the reason I posted this is to make sure that you knew that it is a terrible waste of time and you should just buy new ones. The aluminum you get in your skin is not worth the savings.

Weber venturis will fit in Zeniths. They are a little loose, but they'll work. john Walker told me about this trick. There's a little more to it, but I can't remember.

The problem is finding venturis for Zeniths. That was the whole deal behind everyone saying to avoid these carbs. But now I believe someone makes different sized venturis for Zeniths. But since the Weber venturis can be found used quite readily, I thought it might be helpful to point out that they can be made to fit into Zeniths.

Another alternative is that SCCA 914-4 racer Chris Foley (aka: CFR Welding ) can fab some up for you too. I've dealt with him a number of times and he does great work.

- John

Another source for Zenith parts is... (dare I say it?)... Motormeister. They offer a full line of jetting, venturies or any part you may need for Zeniths. They've always been very helpful to me, whether I needed parts or just a second (or third) opinion.
John

I knew about the webber ones working but am short on cash and have to make it all count. It's nice to be a victim of the tech crash. But I like learning about what is possible so it had value.

Now anyone coach me in drilling out my jets ? what part do I drill ?

You need the proper jet reamers and jet gauges. All you are doing is making the hole larger. But it is absolutely critical that you get them exact. You ream them out with the jet reamer, which is a very small needle looking thing that is square in cross section, and then you check your work with the jet gauge, which is just a steel peg in the appropriate size.