What other symptoms are there? Do the rpms stay low? Do they get higher and drop back down? Does it seem like she isnt getting enough fuel? Is she running on both cylinders? Should be able to get 80-85mph out of that sled.
It could be a lot of things. Clutch, belt, plugs, carbs, fuel pump, piston, rings,etc etc . The list is endless without more info on whats happening.
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