Question about 2006 Yamaha Road Star

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06 Yamaha Roadstar misses under load

About 3 weeks ago, changed plugs, oil (5w30)and filter. Bike began nissing under a load like going up hill. Checked the plugs and the front plugs were light gray and the rear were black and sooty.
Thought I got some bad gas, ran some Berryman B12 in 3 or 4 tank fulls and seemed to do better. Stopped the B12 and the problem came back. .

Installed new plugs and within a couple of minutes, they are gray in front and black and sooty in the rear.

Checked the vacuum hoses, breather hoses, air cleaner, oil is not overfilled, checked the rear coils for spark and they have correct ohm resistance. Pickup coil has correct resistance.

At a loss. Thanks for any advice.

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Carbs are not synchronize. Running richon yhe back and lean on the front. If each carb has irs own filer, check the rear carb air filter.. But for sure get the carbs synchronized. Good Luck.

Posted on Oct 05, 2009

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