Farm Equipment - Wants to stall when reducing throttle…

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Wants to stall when reducing throttle…

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=191441
Printed Date: 28 Sep 2025 at 5:12pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Wants to stall when reducing throttle…

Posted By: Chad_in_PDX
Subject: Wants to stall when reducing throttle…
Date Posted: 24 Oct 2022 at 12:05am

I have a model B that will always stall or nearly stall if I reduce the throttle to idle quickly. If I reduce the throttle SLOWLY, the engine drops down to an appropriate idle speed. The carb is a rebuilt Zenith (model 10698A). Any ideas what’s going on or what I can do about it?

It’s frustrating to have to be so methodical about reducing the throttle. A hand crank-start engine makes stalling not so enjoyable.

Thanks

Chad

Replies:

Posted By: DrAllis
Date Posted: 24 Oct 2022 at 6:08am

Turn the idle speed screw in. Your butterfly is sticking in the bore.