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.

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2004-2006 Yamaha R603 plate Akra carbon can Ohlins steering damper carbon air intakes/rear fender/hugger double bubble race screen YM600 cycle lock LED indicators tail tidy
2009 - 2009 Yamaha R657 plate with titanium Akra full exhaust system ASV short levers Carbon fuel tank/front fender/rear hugger Ohlins steering damper LED indicators, double bubble race screen
2011 - now Yamaha XT660X 56 plate mtc cans 2b contd...

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.

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Plough on

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

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2004-2006 Yamaha R603 plate Akra carbon can Ohlins steering damper carbon air intakes/rear fender/hugger double bubble race screen YM600 cycle lock LED indicators tail tidy
2009 - 2009 Yamaha R657 plate with titanium Akra full exhaust system ASV short levers Carbon fuel tank/front fender/rear hugger Ohlins steering damper LED indicators, double bubble race screen
2011 - now Yamaha XT660X 56 plate mtc cans 2b contd...