Strange knock/misfire at 2500 rpm.

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Don71
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Joined: Tue Oct 01, 2019 11:38 am

Strange knock/misfire at 2500 rpm.

Post by Don71 » Mon Oct 07, 2019 7:26 am

Hi all

Just gave my new to me 2006 Firestorm (75000 kms, jardine slip ons, everything else standard as far as I am aware ) a wash and check over to see what needs fixing.

After washing and chamois dry I started it up and ran on the choke for a few minutes until warmed up (maybe 50/60 degrees showing)
After letting the choke back in (it actually slides in of it own accord but that's for a seperate question) I slowly brought the revs up to see that all was ok.

On passing through 2500 rpm on a steady throttle it gets what I can best describe as a knock/misfire on the engine . Seems to hesitate , knock , no backfire or anything.
Seems to be ok below that rpm and also above it on a steady throttle. All this in neutral at standstill.

I'll let the Bike dry completely to see if maybe it's just a hit of water on things down on some of the electrics , but in the meantime , any thoughts please from anyone who may have come across this issue before?

Cheers
Don

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Wicky
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Location: Colchester Essex
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Re: Strange knock/misfire at 2500 rpm.

Post by Wicky » Mon Oct 07, 2019 12:08 pm

When was it last serviced i.e airfilter, spark plugs? check TPS and breakable plastic choke fittings at the carbs, Carb set up

Choke knob has a plastic retainer at the back that can be tightened to increase friction, if it can't replace choke or use Honda special tool

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Gravelrash
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Location: Bolton, LANCS!
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Re: Strange knock/misfire at 2500 rpm.

Post by Gravelrash » Wed Oct 09, 2019 3:21 pm

I'll just say that if you jet washed it then it could be water somewhere it shouldn't be.

tony.mon
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Location: Norf Kent

Re: Strange knock/misfire at 2500 rpm.

Post by tony.mon » Wed Oct 09, 2019 5:58 pm

Sounds like a carb cough, they all do it, relax.
It's not falling off, it's an upgrade opportunity.

Don71
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Joined: Tue Oct 01, 2019 11:38 am

Re: Strange knock/misfire at 2500 rpm.

Post by Don71 » Thu Oct 10, 2019 9:44 am

Thanks guys for the feedback and info,
much appreciated
Cheers
Don

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