K301 runs rough at half throttle
I have a 1250 with a k301 which starts fine and runs fine at full throttle, but if I throttle down, things are ok until I get below half when it starts running really rough.
I notice the same as the engine shuts down, it gets really rough and the tractor shakes. I replaced the spark plug which was dry but black, and used the gap mentioned in the manual of 0.035 though I have heard others suggest smaller gaps.
Regardless the roughness at low throttle did not change. Any suggestions? Would this point to an issue with the carburetor or maybe electrical (points, condenser, timing...)
I have not had this tractor for long so and it has always run this way since I've had it.
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