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...