Hello from Paisley, Scotland.
Just found this forum today and joined in the hope that you can help me.
I've just bought a Derbi Mulhacen 660 which is fitted with an XT660 engine.
It's not right just quite running right and stalls on occasion.
The spark plug colour is white rather than a "rich tea biscuit" colour - it looks like she is running lean.
I've heard that you can adjust the CO level / Fueling which you do through the dash?
Any help that you XT owners could give would be greatly appreciated.
Cheers Craig