Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  
TomF

Need advice on B-12 engine adjustment

Recommended Posts

Sandy_Lake_Imp
Try a governor adjustment. Loosen the clamp at the base of the governor arm where it attaches to the stub shaft on the side of the cyl block. Move the arm so the carb is in the full throttle position,turn the stub shaft in the same direction as far as it wants to go (should turn easily- don't force it), hold arm & shaft in these positions while tightening the clamp.Of course this is all done with the engine off. Bill

Share this post


Link to post
Share on other sites
TomF
My son Peter and I got our B-12 re-assembled at long last over the weekend. This was one we acquired about a year ago in a package deal: repainted, but never gotten to run well. We had ripped out the entire engine, went back to a magneto and points, tossed in a new battery, and tried to get everything back to OEM condition. She would turn over and we were getting gas in the cylinder, but wouldn't fire...hmmmm? We weren't getting spark, and of course the fear was our mag or electrical work (AAARRRGGGHHHH)! But, NO, fear not! We checked our brand-new two-post Simplicity key switch, and found it to provide continuity to ground whether on or off, key in or not. Comments on that?! Maybe we just got the wrong part??? Anyway, we took the switch out of the loop, and she coughed, fired (YES!), began chugging, and then when increasingly choked, took off to the high rpm zone like a Cessna on steroids! Yikes! On choking back, she died for what seemed like lack of fuel. This happened thrice before we had to quit for supper. We've set the stop nuts on the throttle cable similar to our Big Ten for a starting point, and we are missing one of the (we think) two springs from the governor assembly. Would anyone have any ideas to help bring this B-12 to a full, vibrant working life again? Where should we begin? Thanks for tagging along with us... Tom and Peter

Share this post


Link to post
Share on other sites
tej
Sounds like you have a bad ignition switch. The B-12 switch should read an open when the key is on and continuity between the posts when off. Does it read continuity between the post in both positions or continuity between the posts and the switch body.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

×