Black, fouled plug indicates too much fuel.......or not enough air.....getting into the combustion chamber. Check air filter first and clean if necessary. If the plug still fouls then the carb would be the next component to look at, particularly the float needle. Suggest you get the service manual to learn how to properly set the float level if needed. As a last culprit it could be your quad is jetted incorrectly. This is something you should take up with the Yamaha service/dealer.
|
Linear Mode
