The sherco looks like they have addapted the 2 stroke bottom end (looks very similar)
The front pipe doesnt look right going into the mid section of the exhaust.(i think sherco have just made the front pipe fit the mid section with a bush)
To be honest i think the Montesa is best of all then the scorpa then the sherco.
Most of the parts on the sherco are not even made for a four stroke there just all the 2stroke parts addapted. for example the exhaust etc etc.
James