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I bought this ZRX a few months ago running on three, I thought clean the carbs and it will be job done..... cleaning completed started the bike : sweet, running on four nicely at idle, I had not put the air box back on because I intended to put individual K&N’s on it, so... I gave her some gas and nice response up to 4.500 then nothing, give it full beans and it pulses up and down but will not rev up higher than say 5000rpm then back to nothing and back to 5, OK, I put the K&N’s on still the same, I put 98 main jets in the middle two carbs and 95’s in the two outside, the adjustable fuel screws are set at 2.5 turns out, still the same. What am I missing here, could it be electronic problems?
Help.....
 

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Fuel pump or filter problem,?
Some have had similar problem on the 12 with not revving past say 8k rpm due to fuel pump or commonly fuel filter problems.
 
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