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I have a zx900r when it's standing it will rev to red line but when it's under load it gets to 6000 and won't go over it and runs like a sick pig I'm at a loss
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Then make sure the choke cable is also correctly adjusted, not worn or anything, however if this was the case the bike would not do this but while you checking cables, check both.
Then if you still have the problem, then unfortunately this bikes carbs need to come out and stripped and cleaned. Pull jets out, needle and seats, floats and clean in a dish of fuel and blow through with a compressor thoroughly. Once clean assemble making sure the bowls all fill to the correct levels.
Easy enough to do, I am pretty sure this is your problem. Fuel starvation and you have dirty carbs and dirt in the chambers behind the needle jets. Make sure you clean each jet too.
Good luck and enjoy. PS - while you there change your air filter to. ????
A couple of things to check :-
* pull off the inline fuel filter, if clean great, if unsure change it.
* check for a pinched fuel line from the tank to the carbs. You have fuel starvation under load.
* check fuel tank vent on the fuel cap is working, by opening the fuel cap and seeing if the problem persists after 6000 RPM under load.
* check air intake and fuel filter, change if necessary.
* check for a pinched vent hose on the carburetors, which could prevent the sliders from lofting when a demand for power is needed.
* strip and clean carbs thoroughly, making sure the main jets are clean, needles and seats. Blow out all airways after cleaning in fuel.
I think after all the above, you will win mate. ????