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Old 06-29-2018, 03:49 AM
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The sheen. If it's new just start the engine and remove one spark plug wire at a time. If the engine changes with each wire removal you know that spark plug is firing. If there is no change when you remove one then that plug is not firing. A dead plug would also put a sheen on the water...the film.

If that all checks out then you might want to look at the mixture screw on the carb and back it off a 1/4 turn and see if it's any better. Sometimes corrosion around that port can cause issues as well...if so it can be sometimes difficult to tune it in.

All the best.
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