miss fires at 7000 revs

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ozzie9962
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Joined: Sun Mar 29, 2009 9:15 pm

miss fires at 7000 revs

Post by ozzie9962 »

i have a firestorm with blue flame exhausts on it missfires at 7000 revs any ideas could it need dyno jettin cheers john.
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warby221
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Re: miss fires at 7000 revs

Post by warby221 »

Sounds like it could be 6 to 7k is were the engine is hitting its power band
Do a plug chop when it starts missing and have a look at the colour of it it will tell you if its running lean or rich at them particular revs

Look at http://www.vtr1000.org/phpBB3/viewtopic ... =plug+chop
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ozzie9962
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Re: miss fires at 7000 revs

Post by ozzie9962 »

how much to have it on rolling road and dyno jetted any ideas
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sirch345
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Re: miss fires at 7000 revs

Post by sirch345 »

It could be a number of things causing the misfire, including plugs as Warby mentions, split in the petrol tap diaphragm, split in one of the carb diaphragms, valve timing being 180 degrees or even the air filter needs changing. Balancing the carbs may even help.

Putting it on a rolling road my help in detecting the problem.

Chris.
marravtr
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Re: miss fires at 7000 revs

Post by marravtr »

ozzie9962 wrote:how much to have it on rolling road and dyno jetted any ideas
my mates just been quoted £300 at SPR in nottingham
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Pete.L
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Re: miss fires at 7000 revs

Post by Pete.L »

Your mate must be having a tune done.

It's only £35- £45 depending where you go, for a diagnostic run.

Pete.l
My new ride is a bit of a Howler and I love to make her Squeal
ozzie9962
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Re: miss fires at 7000 revs

Post by ozzie9962 »

ive just put new plugs in origanl exhausts back on and it still does it could be the carbs
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