make sure you threadlock all the metal to metal parts jimmy,inc driveshaft grubscrews and engine bolts or they will move.
if you have had the engine backplate or carb off for any reason they could do with being sealed with high temp rtv silicone gasket sealant to prevent any air leaks,especially the backplate,if that has the slightest air leak it will run lean and inconsistent since we use crank fed engines.
dave
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