Wow what a difference
 

I recently bought a 660x. It didn't feel 100% so decided to give it a damn good service.

Bought a better quality plug, replaced oil, air/oil filter, cush drive rubbers, and chain/sprocket.

The bike feels like e new machine no more lurching forwards when your not expecting it, its lovely and smooth its like it has lost its split personality and has ditched it for 1 stable one now.

Even sounds slightly different. All for the grand total of �160.00
Bargain in my eyes.

Yes the XT does work hard on the chain and sprockets and the cush drive rubbers. Also any engine loves and oil change/filter change.

What milage is on the bike?

If you find the bike feels as if its lurching again check the chain tension and also if the cush drive rubbers loosen up you can pack out the rubbers with some old inner tubing.

thanks for the info going to be monitoring chain closely. Not used the inner tube theory yet but will bare it in mind

Bike on 10k on a 56 plate so lots ofl ife in the ol dog yet