Re: 1964 Evinrude 9.5 Misfire
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May 15, 2018 at 4:59 pm
#76036
Listened to the video, kinda sounds like it has a bit of an ignition miss to me…Not really loading up so much as misfiring…Maybe it is losing/weak spark on one cylinder that is more pronounced at the lower RPM trimmed all the way in….Doesn’t sound great at the higher trim angle either, although much better than tucked all the way in.
I guess I would start with new plugs, even though the ones you have might be new, doesn’t mean they are any good. Then, I would use either the inline neon testers or a timing light and run the engine when the sun goes down…Perhaps you will see one cylinder losing or with weak spark…