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Hello every1,
of late my bike ( Zx636 R ) has been misfirin and experiences major power drops at around 8000 rpm and 12000 rpm.[:0]

when u shift to the 2nd gear and try to pull it to around 8000 rpm there is a sudden drop in the power and then its back again.. its feels as if there were no fuel in the bike.[:0]

can anyone tell me what could be the possible reason?? any advice on this would be of gr8 help..

m worried!! [V]
 

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Sounds alot like bad gas, or water in the gas. Do you buy gas at different spots, or one spot each time?

Run some fuel injector cleaner through it, and replace your spark plugs if they have over 5k miles on them.

Be sure the air filter is not clogged as well.

Good places to start.
 

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I have the same problem on mine but its varies what revs it occurs at sometimes 8 - 9 sometimes 4 - 5 , have removed my PC to check its not that and also need to check the sidestand switch incase its got a momentary fault which could cause the ignition to cut.Fuel could still ignite due to the compression and heat in the engine albeit partially giving the impression of lack of power.
good luck check one thing at a time hopefully you should isolate the problem.
 
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