Easier than Jerry's suggestion: first check the dwell. A burned projection on one of the points will change the dwell, which will in turn change the timing.
If nothing here, then try Jerry's suggestion.
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
