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Farmall H Misfire

A

Anonymous-0

Well-known Member
My H has a parial misfire after about 2 hours of running with a finishing mower behind it. Ignition is an IH magneto. What plug wire type, Copper conductor or other should be on it. It has Belden r3 marked on the wires. Is the coil in the magneto the most likely cause? Could it be carburetor float due to some gas being burned since starting with a 3/4 full tank? This problem is repeatable but seems to be getting worse. It started when backing up to turn around. With the throttle just above idle it would sputter and then pick up the load backing up. It then would sputter when going back to full load with the finishing mower and then smooth out. Any help would be appreciated.
 
Copper would be best with a mag. Check your fire
to your plugs to see if you have good hot fire to the plugs. Your coil may be getting weak after
the engine gets hot. Hal
 
The Check for proper ignition and Wires is first, then possible manifold leaks (vacuum leak, allowing air into system)
If these do no good to help the issue, Try turning out the load screw on the bottom of the carb 1/2 turn at a time to richen the mixture. JimN
 
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