This message is a reply to an archived post by Sojak on July 18, 2017 at 08:56:40.
The original subject was "50 Backfires instead of starting".
Finally figured it out! After checking everything from compression to spark timing to carburetor and finding all seemed to be in working
order. Turning the crank by a socket wrench the magneto had a perfect spark at 5degrees after TDC every time and had a nice wico click.
Turning with the starter showed a spark most of the time and a nice wico click. However, tractor would usually not hit at all or just
backfire which blew up the muffler. New points, condenser, coil, switched to another good known carburetor. Gave up on it a few months and
let it sit!! Finally gave it another go and took off the magneto, AND THERE IT WAS!! The nut that holds the magneto together had backed off
and was laying in the bottom of the tractor's magneto housing. Even without the nut, with the mag bolted up to the tractor it didn't fall
apart and kept working but when the magneto turned very fast the looseness was causing the timing to be off. I went through the magneto and
put her back together and SHE IS RUNNING.
The original subject was "50 Backfires instead of starting".
Finally figured it out! After checking everything from compression to spark timing to carburetor and finding all seemed to be in working
order. Turning the crank by a socket wrench the magneto had a perfect spark at 5degrees after TDC every time and had a nice wico click.
Turning with the starter showed a spark most of the time and a nice wico click. However, tractor would usually not hit at all or just
backfire which blew up the muffler. New points, condenser, coil, switched to another good known carburetor. Gave up on it a few months and
let it sit!! Finally gave it another go and took off the magneto, AND THERE IT WAS!! The nut that holds the magneto together had backed off
and was laying in the bottom of the tractor's magneto housing. Even without the nut, with the mag bolted up to the tractor it didn't fall
apart and kept working but when the magneto turned very fast the looseness was causing the timing to be off. I went through the magneto and
put her back together and SHE IS RUNNING.