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i just bought a 98 zr 440 sno pro it doesnt like to start when its cold at all and you will be riding and it sounds like its running on one cylinder it has 140 psi compression both cylinder on a fresh rebuild carb/fuel pump are clean it runs great when its cold but as soon as it warms up its starts the one cylinder deal and if it does run on two it sputters at wide open any help would be really apreciated thanks
 

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Sounds like your chokes are sticking. You may also have bad reeds and your power valves may be sticky. It has a lot of over lapping symtoms. Also, pull the plug wires and see which cylinder is not hitting and then reverse the wires and see if it follows the wires.
 
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