I have the same issue with my 340 79 Trailfire. Did replacing the stator coils work? If so do you have the part numbers from DK?

I have the same issue (same model and year!) and been looking for some help. Starts on first pull when cold then bogs down and eventually dies after running for some time. Just put in new drive bearings last night and ran it for some time on the lift before I stored it for the year. It was 50 degree...