It will be tricky for you to damage your engine as the 660 is one of the toughest engines around. It will put up with almost anything. As u have no rev counter then you ask for speeds to change gears, but looking at the speedo does not make for good riding. So you must learn to "hear" the engine and to change up or down as required. Take it easy and you will start to learn to use your bike correctly, dont worry!!!!

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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....