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This does not explain how you can sneak up to the 6200 limit on a lighter throttle opening, I like Rick & Ray think you might find your problem in the fuel supply, eg -line size, filter, tank vent,pump relief valve stuck partly open, small line fitting restricting flow etc.
Just had a thought,Is the MSD wired correctly, there was a problem where if the wires were reversed in the connector by people who thought they new better than MSD which plays havoc with the advance curve due to triggering off the back of the wheel, would have to read the article again.[ Circle Track ].
Jac Mac
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