You must go one step at a time and always note what you have done, so you can test and then return to the starting point if required. Bike tuning needs a steady hand and alot of patience. You are starting with a bike that needs attention cos it is a big single tuned by Yamaha to overcome the European regulations for noise and emissions which creates a very poor riding machine that CAN however be dramatically improved fairly easily and without too much expenditure.

So follow the threads, read everything, ask loads of questions and take one step at a time. Have fun!!!!

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....