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There are a few possibilities:

1. insufficient aspiration... it's not getting enough air. Possibly bad carburetor, possibly dirty air filter.

2. restricted exhaust. Possibly oil fouled catalytic converter, possibly bent or collapsed exhaust.

3. valve float. Possible weak valve springs preventing the valves from returning quickly enough. 4. ignition timing. Ignition may be firing too late.

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17y ago

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