Hi I have been having trouble getting scooter to run properly with the HP4 lightened flywheel I bought from SIP.
Keep getting a misfire, tried it with the spacer and without , it runs better without the spacer but still misfires, put original flywheel back on and it runs fine.
All the timing is set correctly, the mechanic doing it has fitted lots of these before and never had this problem.
Fitting it to a PX200 disc model, with malossi 210 kit , malossi exhaust ,T5 4th gear, 60mm crank, malossi reed valve with 30mm delorto carb and reinforced clutch basket and springs.
Any idea what might be causing it to misfire with lightened flywheel on?