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Old 09-15-2020, 08:26 PM   #17
5Tractorguy
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Join Date: May 2015
Location: Central Massachusetts
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Re: 350 has bad misfire/shudder over 2000RPM

Quote:
Originally Posted by blazer2007 View Post
How did you figure out it was the coil. I would never of thought of looking there and how would the coil do that. I thought coils worked or didn,t
Dad said "put the spark tester on it and see what happens"... turns out it was orange rather than blue or white.

It does make sense, I run into that with Kohler engines and Gravelys. The old Kohler K series will idle fine on a weak spark, but try to put a load on or rev up and it falls on its face. Gravely's with Wico magnetos will start and run fine, throttle up okay, but one sudden load and it immediately stops firing and dies. Some will run but have choppy intermittent fire (like the 350 at high RPM's).
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