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remove the distributor cap. turn the motor by hand and watch the rotor on the distributor. once it moves turn the motor the other way. if rotor on distributor doesnt move amost imidiately after you start tuning motor by hand the chain has some stretch in it and most likely should be replaced. the motor will run noticably better with a good tight chain. if its a factory chain with nylon gears it is junk anyways. replace it with a quality metal geared set.
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