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Many potential reasons, but since you do get an occasional surge of speed, I'd put a dirty or degraded carb as number 1 on my list (especially if the carbs have never been cleaned or rebuilt). Theses carbs need to be taken apart and cleaned occasionally, and you are overdue if it has never been done. It is amazing that a very small defect in a needle valve, etc., could restrict fuel flow and give you an occasional surge as it turns a certain way (look for rings around the needle valve taper).

Other potential power loss problems on this model could be from a failed power valve and/or damage to a cylinder (your cylinder should be good if compression is OK). If the carbs are good (you know they have been cleaned/rebuilt recently), check to be sure the power valve motor is actually running. Not unusual for a power valve to get stuck, come loose, etc.. They don't always destroy the piston/cylinder, but could cause performance problems.

Another consideration is the cat/con. If you haven't done it already, consider getting rid of it and installing the D plate. The cat/con can fail and result in power loss also.
 
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