View Full Version : weber Carburetor

01-25-2007, 03:34 PM
i need to rejet my weber Carburetor .any idea of the right jets to use? 1971 IIA with a 2.5 cam...i live only 1000 feet above sea.

02-01-2007, 08:28 AM
you can buy the jets from alomost any place that sells weber parts. try webercarbs.com.

also top end racing hads a very informative site for weber info in general. I would think you'd be fine though. how do you know you need to re-jet?

02-01-2007, 03:16 PM
i only getting 11 MPG in town.most i know around here are doing better then 15 MPG.
and after talking to a few people about MPG. i should also.
timing ---ok

02-01-2007, 09:34 PM


Try one of these places. The Weber is used on so many different engines that it rarely comes properly jetted usually too lean though! I've never actually heard what jetting is correct for the 2.25/2.5.

02-01-2007, 09:38 PM
Ditto.... people getting *really* great gas mileage out of a Weber are in actuality, running it too lean.... if the mixture is correct, the mileage won't be as high... you may be closer to where they need to be, and not that you need to change to be more like theirs....


Tim Smith
02-01-2007, 11:51 PM
I can attest that my 34ICH is getting far better that 15 miles per gallon. However I can't tell you exactly what my mpg is due to no odometer.

All I can tell you is that it's cheaper to run my 88" than my diesel car. That's another story though...

Good luck!

02-02-2007, 07:31 AM
I am getting 17-18 mpg with a W single brl.

There is some information on them here that may help with the jets:


02-02-2007, 07:45 AM
A little better diagram and list:



02-02-2007, 10:42 AM
Honestly I'd look elsewhere for the problem first. How is your timing? What do your spark plugs look like?

Mike Kennedy
02-10-2007, 06:56 PM
I put a single barrel Weber on My 67' Series IIa over 15 years ago. I got around 15 -17 MPG and was satidsfied, About 2 years ago I had the rig in a local very good older car garage to work on other stuff and he comented how gutless my Rover was ( he has a 31 Model A with more pick up - really) He asked me if he could mess with it - and felt it was definatly not getting enough fuel. He ended up re- jetting it twice to find the best combo - It now only gets 10-12 MPG BUT it runs fantastic!! Gas Cost be dammed - I love the fix! Try it!:thumb-up: Mike