Model 25502B. One cylinder (have not determined which one yet) cuts out at low RPM but not all the time.
I've replaced the ignition coils and plug wires, points/condensers, and set the point to .02"
Yes, I've over hauled the carb and cleaned out all passages. Wouldn't it have to be electrical when only running on one cylinder?
I have a spark checker but the problem doesn't happen all the time. Seems to run fine at high RPM's but runs intermittently on one cylinder at idle speeds and then dies but will be fine again for awhile after it's re-started.
Checked spark with a spark checker, jumps across a 5/16" gap, but again it's an intermittent problem. Runs on both cylinders at higher than idle speed but at idle sometimes only runs on 1 then sometimes will pop back to running on 2.
You might be able to narrow down the cylinder by placing the spark checker in-line with a spark plug, then running the engine. Run at idle and check for intermittent weak/no spark on spark tester that corresponds with the engine misfire. I have also heard to use an inductive timing light to diagnose an intermittent weak spark. Good luck, I am working on this problem myself (different motor). I think I have narrowed mine down to either a power pack or sensor coil with intermittent problems.
