Have a 2015 300cc sherco. On my last ride noticed a hudge amount of smoke from exaust. And some rear fender melting. It was during a uphill trail at moderate engine load. Have done it many times before without issues. To me it is clear that there something wrong. Checked water level, water flow, fan working speed....ok. engine temperature and power nice. Start easy hot or cold.
When I back home checked rear exaust blocage, carburetor, gearbox oil amount, magneto key and everyting seems ok.
Than, checked timming with stroboscope. 5mm btdc just after idle and 7mm over ~3000rpm. This look too much to me! retarded the timming as far as possible but keep having same readding.
Can be too much advance causing this exaust overheating? is I am missing something?
Havent "kick back" issues.
always had few pinging when too much throtlle at low rpm
There is a leakage in reed valve rubber gasket....
