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I've run a generous amount of seafoam through it over the past couple of tanks. I think its going to require manual cleaning.
No, I haven't messed with the carbs too much. In fact, they're only tuned per my highly calibrated ear. The plugs do look great though. They're always a nice light tan.
I run 87 octane ethanol gas.
I also checked and adjusted the valve clearance earlier this year.
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