Re: Misfiring @ idle John Deere A

Posted by DRL on January 27, 2005 at 17:03:26 from (207.254.224.166):

In Reply to: Misfiring @ idle John Deere A posted by Roy Miller on January 27, 2005 at 13:05:01:

Roy,

This is the nature of the beast. With the single barrel carb and the firing order, all of those letter series two cylinders will miss, especially on the right hand cylinder. The John Deere two cylinder engine has a unique firing sequence. The #1 (left) cylinder fires, then at 180 degrees afterward, the #2 (right) cylinder fires. Then there is one and one half (540 degrees) revolutions of the crankshaft when neither fires. Then the sequence starts again. The left hand cylinder gets a fuller, richer charge of fuel vapor from the long 540 degree cycle whereas the right hand only has the 180 degree cycle to get it's charge. It will miss and pop at idle, (hence the nickname "Johnny Popper"), but put under load, both cylinders fire equally since the governor has opened the carb plus more vacuum pulling the fuel mixture through the carb and manifold. If you pull the plug wire off of the lefthand cylinder, the right hand cylinder will then start firing. Try it. If this doesn't help, post back and we'll go from there.

Follow Ups:

• Re: Misfiring @ idle John Deere A Rockin' Farmer 19:26:46 01/27/05 (0)

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