Farm Equipment - D15SII carburetor adjustment, using D17 venturi?

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D15SII carburetor adjustment, using D17 venturi?

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=193689
Printed Date: 19 Jul 2025 at 4:21am
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Topic: D15SII carburetor adjustment, using D17 venturi?

Posted By: Dean (West MI)
Subject: D15SII carburetor adjustment, using D17 venturi?
Date Posted: 22 Feb 2023 at 9:30pm

What are the baseline settings for a MS TSX 869 carburetor on a D15 SII? 1.5 idle and 2 for main jet?

Also, has anyone run one with the larger D17 venturi? Any difference in performance or basline carburetor settings?

Thanks!

Replies:

Posted By: DrAllis
Date Posted: 23 Feb 2023 at 5:25am

D-17 Marvel Schebler carb has a 7/8" venturi. The last D-15 S2 I had apart had the same 7/8" venturi. Main jet adjustment...wide open throttle with a warm engine. Turn in L-screw until engine just begins to falter. Back out 1 full turn. If it stumbles on acceleration, give it another 1/4 turn at a time until it doesn't stumble any more.