1980 morini m1- I start the engine up and will run just fine up (max speed ~28mph) until I slow to a stop. Once I start going again, the ped only goes about 5 to 10 mph.
I'm wondering if it could be the high tension coil, as it is the original. Perhaps the condenser on the stator..
I just changed the spark plug and it helped but didn't solve the problem.