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Jeff,
Bob's advice on timing is right-on as always and matches my former problem. Adjust initial and idle speed carefully. You may have too much total advance, as I did. Would be difficult to hot start also. If your combo likes a lot of advance you can switch to 100 octane if available, but if you have aluminum heads you should be able to tune for pump fuel under 11:0-1. Inspect your plugs to see what's going on in your chambers. [hot spots, as Bob said]
Good luck,
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Chas.
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