M151A2 Holley Carb

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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Data Plate
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M151A2 Holley Carb

Post by Data Plate » Mon Sep 02, 2019 6:41 pm

I have a Holley carb on my A2. Does anyone know if theres a factory setting for the mixture screw like 1.5 or 2 turns out. Doesn't seem to be running 100% getting some back fires when i get off the gas and would like to try the factory setting if there is one.

markrdje
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Re: M151A2 Holley Carb

Post by markrdje » Mon Sep 02, 2019 8:02 pm

It's 3/4 out on the mixture screw.I'll let you know where I found it, with some backtracking--It's in the 34 TM, 1972, Chapter5, page 5.1, Holley carb section.
I had the same problem, there is a big hex head bolt/cap on top of carb, loosen it, you will find a metal screen in it, I cleaned it with carb cleaner.The mutt goes better/no backfiring.
Last edited by markrdje on Tue Sep 03, 2019 11:13 am, edited 1 time in total.
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Rickf
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Re: M151A2 Holley Carb

Post by Rickf » Tue Sep 03, 2019 7:33 am

I have pointed this out many times, The Holley was discontinued in 61-62. There must have been a good reason for it since they never brought it back and parts are not available for that carb so basically there are no settings specifically for an A2. Just turn it in till it stumbles, back out till it stumbles and then got dead center between those two spots. Myself personally, I cannot see the fascination with the Holley carb. I have found a properly set up Zenith will run much better. AND, you can still get new parts for the Zenith!
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Data Plate
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Re: M151A2 Holley Carb

Post by Data Plate » Tue Sep 03, 2019 7:34 pm

Thanks for the info ill give it a try. The carb was on the jeep when i had bought it and always ran well. But then sat for awhile. Ill try the adjustment and the screen cleaning and hopefully it will be OK

Data Plate
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Re: M151A2 Holley Carb

Post by Data Plate » Wed Sep 04, 2019 4:28 pm

I cleaned the filter today and turned the screw in and backed it out 3/4 turn, then turned right and left with it to get the in between spot, Seems to run pretty well but does pop sometimes. maybe timing ??


Rickf
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Re: M151A2 Holley Carb

Post by Rickf » Wed Sep 04, 2019 6:47 pm

Is it backfiring out of the carb or the exhaust? If out of the carb then running too lean or timing to far advanced, most likely too lean. If out the exhaust it is due to rich exhaust being lit of in the exhaust by oxygen getting in through a leak in the exhaust somewhere.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Data Plate
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Re: M151A2 Holley Carb

Post by Data Plate » Fri Sep 06, 2019 6:00 pm

Pops threw the exhaust ill adjust it a 1/4 turn ands if that helps, thanks for the help. Rick are you going to Gilbert ?

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