One of the biggest issues is too much weight with what is a fairly detuned engine. But this is good if you want reliability. The steel frames weighs lots but is massively strong. Adding more steel bars makes a heavy package even heavier which translates to lower speeds and more consumption. By all means put bars on if you plan on falling and only ride in rocks, but I wonder how many of us use our bikes in this way.

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2010 XT660Z Blue, Exan can, UFO high front fender, SW Motech baseplate, heated grips, 12v point, Kevs Fuel & O2 mod, DNA Stage 2 Filter and cover, Givi tall screen, Mefo mfe 99s, Kevs throttle mod, TT high seat and 'compass'