I think most guys recommend the renthal sprockets with tsubaki x ring chain. Also DID chain and sprocket kits come highly recommended.

Captmoto said in another thread:

Recommended after market chains & sprockets for the XT's are Renthal sprockets and Tsubaki gold (not real gold) chains

For XTX / XTR http://www.bandcexpress.co.uk/shop/t...%5E+XT660R.htm

That's where I got mine from good price and quick delivery. Very happy with the quality and brought a scottoiler at the same time to keep them tip top.

Phil

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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights