Full disclosure - I am not experienced with engines, I have toyed around and researched Puch motors since I bought mine last year.
My Puch Maxi (kick start, unknown model/year) can't propel itself from a standing start. If I plant my feet - it barely 'fights back'. It gets up to about 2 km/h on WOT and revs really high. I work around this by jogging it along until about 10 km/h, which is about the speed it needs for the clutch to engage (I assume that's what happening). Once engaged, it cruises up to about 30 km/h and runs reasonably well besides four-stroking at certain speeds/throttle. I checked the carb, and can't find anything obviously wrong there - jet is clean etc.
Could this be an air leak, or is this most definitely a clutch-related issue? Air leaks call for new gaskets, but how would I go about diagnosing the clutch? Any and all suggestions are much appreciated.