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Old 11-26-2012, 05:22 AM   #1 (permalink)
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Default misfire? new spark plug?

hey guys,

my z750 has about 5k on it.
recently it sounds like its been sputtering a little, and when i try to keep it at a certain higher rpm eg. 6k rpm, it would fluctuate up and down.
do you guys think it needs new spark plugs?

thanks in advance!
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Old 11-26-2012, 06:41 PM   #2 (permalink)
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certainly worth a shot.
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Old 11-26-2012, 07:12 PM   #3 (permalink)
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Try dumping your gas tank and refilling with fresh gas.
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Old 11-26-2012, 07:15 PM   #4 (permalink)
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Does it backfire at all when you decelerate?
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Old 11-26-2012, 09:03 PM   #5 (permalink)
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What year?
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Old 11-26-2012, 09:04 PM   #6 (permalink)
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is this bike modified in anyway? Pc3, exhaust, etc.
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Old 11-27-2012, 12:01 AM   #7 (permalink)
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Air filter clean?
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Old 11-27-2012, 01:12 AM   #8 (permalink)
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It might not be a bad idea to pull the plugs, check the gap, and see how they look. Also make sure the wires are on tight and the coils are clean.

While the tank is off make sure the intake and filter are OK.

It sounds like bad gas though. Was it stored over the winter without stabil or anything in it? Swap out for some new gas and put some injector cleaner in it. Ams-Oil makes some good cleaner and thats what I use most the time.
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Old 11-27-2012, 01:26 AM   #9 (permalink)
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I'm holdin out for more info on the bike b4 I say somethin abt the carbs
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Old 11-27-2012, 03:19 AM   #10 (permalink)
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Quote:
Originally Posted by chris140 View Post
Does it backfire at all when you decelerate?
yes sometimes, but when yeah its more and more obvious that its misfiring today when i was riding, didnt get to ride it much the past few weeks
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