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I recently replaced the plugs and battery because my bike wouldnt start at all unless hooked up to a battery tender. Now the bike starts every time, but in the low RPM range, I am getting a lot of miss fire and hesitation. The carbs were just cleaned and rebuilt, but I do not think they were synced. Could the carbs not being synchronized cause this? Or is there some other problem I am over looking? Any help would be appreciated. Thanks
 

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Check plug wires and caps while parked in a dark area, for arcing and broken insulation.
Try spraying a light water mist around the wires if needed.

Double check new battery for proper terminal voltage. Occasionally a new batttery can be bad.

You can make an inexpensive but functional manometer with a yardstick, 10' of 1/4 inch clear plastic hose, a few zip ties and a few ounces of ATF to sync the carbs yourself.

You can try a simpler check first though. Check to see that both throttle levers on the right side of the carb are starting to move at the same time.
 
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