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I have an 86 cougar with a 440 twin, fan cooled spirit motor. one plug- left side- is fine other- fan side- is fouling, black and oily, single carb replaced crank seal happens after its warmed up rode about 45 minutes on new plugs before it starts acting up, any suggestions is appreciated thanks'

[red]Moved to The Shop by Polaris-Man[/red]
 

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which seal did you replace? crank or pto side? crank side seal failure will blow oil onto your points causing missing and backfiring usually after 1 half hour running [:D]
 
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