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Old 07-11-2018, 06:33 PM   #1
kmbelt
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Join Date: Jul 2018
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Default G8 randomly sputtering

My father-in-law picked up a 90 or 91 Yamaha G8 for $500. He has it running, but not reliably. He has done the following.

Changed oil
Changed spark plug
Changed fuel filter
Cleaned carb (no rebuild kit though)
Took apart and checked fuel pump
Replaced Coil
Generator is putting out good voltage.

Even after doing all this, it will randomly start sputtering, backfiring and running like a dog. After a while it'll be fine again. We assume it's an electrical issue and plan to check all wiring connections.

Any ideas are welcome. We hope it isn't the ignitor.
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Old 07-11-2018, 07:02 PM   #2
smallblock450sl
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Join Date: Oct 2007
Location: Tacoma Washington
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Default Re: G8 randomly sputtering

A dynamic spark test would be of good use on this. About 10 bucks at the auto parts store. Plug it onto the spark plug and the cap and run the car. When it starts sputtering, check for good spark. This will help isulate if it is spark problem. Did you use an NGK-BPR2ES spark plug? Was the coil OEM or aftermarket?
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