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Allis B
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john2189 View Drop Down
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Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 430 		Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Topic: Allis B
    Posted: 07 Sep 2026 at 5:09pm
Lately when mowing grass, my B cold start needs no choke at all, ever.
After about five minutes or so it starts running rough. If you pull choke a bit, it evens out and runs great. Push the choke in, and it starts running rough again.
Why would it not get enough gas after warm up?
'41 Allis B
'49 Farmall Cub
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 93059 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2026 at 5:30pm
your main jet in the carb is partly plugged... so it takes no choke ( restrict the air) to start... As it warms up, you dont have enough fuel to mix with the air available.
Like them all, but love the "B"s.
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john2189 View Drop Down
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Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 430 		Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2026 at 10:18pm
Thanks, I’ll pull the jet and check it. In fact I was thinking about getting a kit and rebuilding the carburetor.
'41 Allis B
'49 Farmall Cub
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