Hi,
Our experience with the Rotax:
1 (original engine) suffered from the cracked crankcase problem the earlier motors had. No help from Rotax.
2 Freak failure. We had a Rotax carb heat system fitted on the engine (original factory fit). It uses a extra assy fitted to the outside of the muffler which has circular spacer rings separating the outside of the muffler from the inside of the heater sleeve.
One of the these ring collapsed and a piece found it's way right through the carb system into the no.1 cylinder. Not good. We are told because of the shock to the engine we need to replace:
Crankcase and crankshaft assy including conrods.
No1 cylinder and piston.
Check gearbox.
Now the Zongshen looks attractive.
