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Long Shot....Weber MCHH Jet Size...

Posted by magohn 
magohn Avatar
John H
Woodinville, WA, USA   usa
1978 MG MGB

Hello All,
This is a long shot but does anyone know the default (shipped) jet size of the Weber 45MCHH? I bought mine used and it came with a sleeve of different sized jets (most missing) and as the carb is a little heavy on gas I was wondering if anyone knew what the default jet size is supposed to be.?
Thanks much, John

Charles Moore
Texas, USA   usa
1979 MG MGB

John -- I bought mine new from Weber Direct, but there was nothing in the accompanying paperwork that mentioned jet size. I just checked.

Chuck

magohn Avatar
John H
Woodinville, WA, USA   usa
1978 MG MGB

Thanks chuck - worth a shot. BTW - whats the MPG on your car?
Thanks, John

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lewk Avatar
Keith Lewis
Cambridge, Ontario, Canada   can

I read on another forum that the 45 mchh comes with a #40 idle jet, the guy contacted Weber Direct and got a #45 and a #50 sent to him. Installed the #50 and apparently solveed his problem.

I have a question that might sound a bit silly, but which screw is the idle screw and which screw is the mixture screw on these carbs?

magohn Avatar
John H
Woodinville, WA, USA   usa
1978 MG MGB

Thanks for that. AFAIK there is ONLY an idle mixture screw - the one that is visible on top of the carb. Any other adjustments is all via swapping out jets.

Thanks again, John

lewk Wrote:
Quote: I have a question that might sound a bit silly, but which screw is the idle screw and which screw is the mixture screw on these carbs?





Edited 1 time(s). Last edit at 2008-04-05 09:35 AM by magohn.

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lewk Avatar
Keith Lewis
Cambridge, Ontario, Canada   can

Thanks John, but what is the screw above the throttle "wheel"?

Rich Mintz
Long Island, USA   usa

I also installed a 45MCHH on a 1980 B. After installing new motor mounts I was no longer able to fit the air cleaner and had to resort to a cut down stack (only 1 1/2" exposed). I tried many different motor mount shim combinations but couldn't align it any better, and even now the top of the carb is within 3/8" of the MC.

Original jet sizes installed in mine were:
idle: 40, however I had to replace with a 50
main: 170 - my car runs extremely rich and I'm waiting for delivery of a smaller jet
air correction: 160

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RAY 67 TOURER Avatar
Ray Marloff
Fort Bragg, CA, USA   usa
1967 MG MGB "My Girl"

After many years of trial and error, I wound up using .55 idle jets and .170 mains. I found that the 3.5 auxiliary venturis worked best with my application. Your results may vary. RAY

Bealey Avatar
Joe & Barb Hahn
East Wenatchee, WA, USA   usa
1971 MG MGB "Bealey"

Ray,

Are you by chance talking about a 45 DCOE as oppossed to a 45MCCH?

Joe

BeanMakesPower Avatar
Bean Gawelko
Phoenix, USA   usa
1983 Dodge Ram 1500 Pickup 4WD "Cherry - Bomb!"
1988 Suzuki Grand Vitara XV6 AWD "Jurek"

Try Midwest-bayless.com

They have an entire weber parts section for jets and little pieces like that. Its all stock stuff..

If you need any further help, call Weber themselves! 631-863-2036. The carburator guy leaves around 430.

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