Haybusa Parts and Service Member Support

Author Topic: missfire  (Read 151 times)

Offline lgv

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missfire
« on: October 07, 2017, 04:40:01 AM »
hi looking for some help with a misfire i have on my 2007 gen 1. At tickover there is a slight fluctuation i the revs as if it is missing every few seconds, at just over 2000 rpm, 3500 rpm and 5000 rpm when riding the bike seems to run a bit uneven and is now doing my head in.
I have cleaned out the tank, fuel filter, pump, fuel lines and injectors, replaced plugs using standard CR9E plugs, changed all 4 COP's balanced throttle bodies and set  TPS so now im stuck and looking for any other things to check so if anyone has had this same problem or can help i'd greatly appreciate it. Ive done a search on here without much luck. Thanks in advance
« Last Edit: October 07, 2017, 04:46:09 AM by lgv »

Offline Stainless1

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Re: missfire
« Reply #1 on: October 07, 2017, 09:49:51 AM »
Sounds like you are not running the engine RPMs high enough.  5000 is barely up on the cams where they are designed to run... riding at 2000... the motor has no torque there... How does it do above those numbers? 
Bonneville 200 MPH Club
245 MPH Turbo Busa Powered Lakester
208.959 MPH NA GSXR 1000

Offline lgv

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Re: missfire
« Reply #2 on: October 07, 2017, 10:00:51 AM »
it runs perfect at all other revs but its a pain in the town and in traffic sometimes. ive tried everything i can think of and its getting to the stage where its doing my head in trying to get it spot on.

Offline Stainless1

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Re: missfire
« Reply #3 on: October 07, 2017, 10:07:27 AM »
Downshift...
Bonneville 200 MPH Club
245 MPH Turbo Busa Powered Lakester
208.959 MPH NA GSXR 1000

Offline lgv

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Re: missfire
« Reply #4 on: October 07, 2017, 10:10:10 AM »
lol yeah i can ride round about it but id prefer it to be spot on. it was never there before

Online Nosgsx1300

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Re: missfire
« Reply #5 on: October 10, 2017, 03:02:38 PM »
I routinely ride around with 20-40 gearing at 1,800 rpm
Bike should run smooth everywhere

Have you done a compression check and or leakdown?
Reflashed the ECU? Airbox mod?

RCC GT4088R
2011 Loring 204.88mph "naked"
2015 Loring 220.01743 MPH Faired in fifth gear

Offline lgv

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Re: missfire
« Reply #6 on: October 12, 2017, 12:39:51 AM »
checked all of that, going to replace fuel pump next



Online Nosgsx1300

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Re: missfire
« Reply #7 on: October 12, 2017, 06:16:47 PM »
possible to put a fuel pressure gauge on it and ride?

Pump issue you should see a pressure fluctuation
RCC GT4088R
2011 Loring 204.88mph "naked"
2015 Loring 220.01743 MPH Faired in fifth gear

Offline lgv

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Re: missfire
« Reply #8 on: October 13, 2017, 06:21:37 PM »
replaced fuel pump, sounds a bit better, need to take it a test run tomorrow to try it out

Offline lgv

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Re: missfire
« Reply #9 on: October 14, 2017, 11:50:40 AM »
new fuel pump fitted and my little misfire has gone, only getting a little stumble at 1900rpm which is probably my fault by adjusting something. pulls from 1500rpm in 6th smoothly ( except 1900 rpm) all the way up the revs. happy days :huepfenicon111: