Bing replacement

I have a 1974 CR 125 and I am looking to replace with a Mikuni. Has anyone any experience with this in terms of model used and jetting.

Help appreciated.

I can't say exactly as I run a 250, but, I run a 38mm - you could probably run a 34 on the 125 on the big end... hopefully somebody will chime in.

Many years ago, replaced with a 32 on a 74 wr125.

Thanks anyone know what jetting.

BUMP
Does anyone know or even want to guess at the Jetting for a Mikuni 32 on a CR 125 1974

1973 Cr125 Mikuni jetting

I run a 32mm VM Mikuni on my 1973 Cr125.

Try starting at:
30 pilot
Q-0 needle jet
6F5 needle on the 2nd slot
2.0 air jet
2.5 slide
290 main jet

Note: I have very modified porting, a custom pipe, .030" piston to head clearance (high compression) and 3mm BTDC timing with a PVL ignition.

If you're going racing I can supply porting and pipe specs. Got a few holeshots and wins in AHRMA national competition.

Craig P
#474
California

P.S. If your Bing is not worn out it's a good carb

If you run a UFO slide insert (highly recommended) use a 15 pilot and a 3.0 slide. http://www.thunderproducts.com/u_f_o.htm


Craig P
#474