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Yamaha 90 Big Bear - High RPM Miss

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My fathers new to him 90 350 Big Bear has a high RPM miss and fouls plugs. Any ideas of where to look?

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have you clened/checked the air filter?

i have a clymers for that bike if you need some specs.

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Air filter is new. Does the Clymer manual have ohm checks for the ignition coil and magneto.

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sry been away. i will check for you.

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New plug installed. No change

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