View Full Version : Jet recommendation for new Carb

12-22-2003, 03:49 PM
My son and I have installed a single Mikuni 44 PHH side draft carb to our MG Midgeet 1500. The Mikuni is almost identical to a Weber 45 DCOE.

We have 34 mm chokes,175 air jets, 175 main jets and 4.5 pump jets.

We can start a cold motor on the choke and after everything warms up, it can come off choke and will idle at 1,000 rpm. This is with the idle mixture screws turned out about 8 full turns.

Driving is manageable if you apply the throttle slowly. if you apply it faster, there is a major stumble and the engine doesn't want to go much past 5,000rpm.

Anyone have suggestions as to a different jetting combination?


Tom Speed

12-23-2003, 12:25 AM
Aimed at the spit, but I think this will help:

Dave Russell
12-23-2003, 04:18 AM
Hi Tom,
You may find this useful to help setup your carb.


12-23-2003, 04:42 AM
Here's something I found for specs on this carb as used on an MGB...not the same, obviously, but might give a rough idea for your 1500:

Recommended initial jetting: main 150, air 200, emulsion tube (jet block assembly) OA, slow run 57.5, pump 40, venturi 34mm.