I am running out of stuff to check and looking for advice.
I have a Puch Maxi with a Polini kit, boss pipe, 15 bing carb, 82 jet, points timing is set at 18 degrees BTDC, point gap is 0.4mm. This bike was a reliable daily driver for nearly 5 months.
About 2 months ago over a few day period, the bike got harder to start and started to have poor performance to the point where the bike would only go 10 - 15 mph with full throttle. I put a new spark plug in the bike, cleaned the carb, and checked the timing. The timing had retarded a bit. I previously had trouble with this bike and the flywheel slipping on the crankshaft. I purchased a new flywheel so I thought I was beyond this. I followed the lapping guide on MA, using grinding compound to get a better fit for the flywheel.
Starting the bike was still very difficult and I would need to give the bike at least half throttle to keep the bike on. When I let off the throttle the bike dies. The performance is the same. I thought I had developed an airleak so I built a leak down tester but the engine seemed the hold pressure. I had also noticed that the engine had more than usual white smoke so I felt that the transmission side seal had gone bad. On engine tear down, the transmission seal was on backwards but looked good. I replaced all of the seals and bearings on engine rebuild. I also reshimmed the clutch.
The bike is doing the same thing - hard to start, needs half throttle to stay alive, dies when I let off the throttle, and will only go 10 - 15 mphs. I thought it might be the stator, condenser, and coil - all I have swapped off my other bike with no difference in the symptoms. I have a healthy looking blue spark. I checked the reeds and they look brand new.
Any ideas or advice?