Question about 1993 kawasaki ZZR 400

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No power and high fuel consumption

The bike does not seem to go faster than 120km/h in 6th gear. It picks up nicely through all the gears but as soon as I reach the higher gears (5 and 6) the power drops and I cannot maintain the speed. To keep it at around 130 km.h I need to be in 5th gear at about 11000 revs.
The fuel consumption therefor is high as to i have to have the throttle open full to keep up the revs.

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Suspect worn needle valve & seat assembly !---Quick test , with care>Whilst riding on open road &holding throttle at set position, switch off fuel supply & note IF engine speeds up, IMMEDIATELY Back off throttle, watch rear vision mirrors for traffic behind & switch on fuel supply!---If that small test indicates Carburettor area of further examination, UNLESS YOU ARE QUALIFIED the needle valves need to be examined byTrained eye!-(Especially wear on sides of needle valve & ALSO, check "floats"Stay Upright Des

Posted on Jan 17, 2009

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