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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Are you feeling and misfires and have you checked compression and checked timing?
If the shear pin on the flywheel were to slightly twist it would throw your timing off. Have you noticed rough running or misfires?
Shear pin on the flywheel is what I am referring to, and it does not take hitting something to cause this. You would want to put a spark tester on this motor and check all cylinders to see if they are all firing the same, one down, or misfires, weak, so on.
If spark is strong and no misfires than I would check timing and then next move onto possible fuel issues, as it would be likely an issue with the carb and fuel delivery. The carb may very well need to be cleaned and rebuilt.
Thank you!- Joe
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"Electronics" control ignition side so if there are no problems with ignition (which is what I am having you check) then I would move on to the carbs and check them.
In terms of the flywheel shear pin you wouldn't have a sheared pin but instead a slightly twisted one which would throw the timing off and cause problems trying to time it. It should be straight and not twisted off center what so ever.