What makes a WD pop when throttle is closed?
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=210397
Printed Date: 16 Mar 2026 at 5:50am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: What makes a WD pop when throttle is closed?
Posted By: kevin LA-CA
Subject: What makes a WD pop when throttle is closed?
Date Posted: 14 Mar 2026 at 8:05pm
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I know that the WDs always pop when you close the throttle quickly. Mine really pops. Loud - 2 or 3 bangs. Magneto ignition. I have timed by ear - don't have a timing light. Also aftermarket marvel carb with adjustable main jet. If I got found a light, where is the timing mark? |
Replies:
Posted By: Ed (Ont)
Date Posted: 15 Mar 2026 at 6:57pm
I see you have the same post twice. If you have a light you time it laying on your back. Take off the inspection cover for the clutch. Clean things up. You will see marks on the flywheel. Time it to the âFâ mark at 1/2 throttle or more. That is 24 degrees if I remember correctly. You will need 2 people who kind of know what they are doing! You can use the light, other person to play with the distributor. Or if you have no help you can do it yourself - may have to get up and down a few times. 
The âFâ means fire.
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