Serious Misfire under hard acceleration

[mark71]

Hi there all does anyone have any ideas about why my bike serously misfires whilst accelerating hard however when you role on the power gently there is no problem at all, I have my own ideas however the dealer of course blames the after market exhaust system on there but will look at it once I have changed it and the aux lights make all the difference of course.

So I will change everything to standard and see what they can do but it does somewhat marr the perfect bike that I have and I love it to bits because it does everything that I want it to.

So please all ideas on a back of a postcard please.

 

[John Armstrong]

http://www.ukgser.com/forums/showthread.php?t=95001&highlight=misfire

Plug's / plug caps?

 

[k12pfc]

Different bike but my K12s did the same with aftermarket exhaust, swapped it back, no problem.

 

[JohnC]

Loads here with aftermarket pipes and no misfire

the dealer

 

[Pressurized]

Sounds like a fuel pump failure - unable to deliver the fuel for high power but OK lower. Could also be plugs - check all four caps.

 

[Clive]

Hi there all does anyone have any ideas about why my bike serously misfires whilst accelerating hard however when you role on the power gently there is no problem at all,

Similar to a problem I had - a fresh set of plugs fixed it.

 

[fishmonger]

Check the fuel Tesco, Morrison etc

 

[Stig]

Hi there all does anyone have any ideas about why my bike serously misfires whilst accelerating hard however when you role on the power gently there is no problem at all, I have my own ideas however the dealer of course blames the after market exhaust system on there but will look at it once I have changed it and the aux lights make all the difference of course.

So I will change everything to standard and see what they can do but it does somewhat marr the perfect bike that I have and I love it to bits because it does everything that I want it to.

So please all ideas on a back of a postcard please.

Had that on mine .... Rode from Norfolk to Cornwall n' bak like it .. turned out to be failing coil/s . .. replaced under warranty

 

[Phil Thomas]

Plug Caps - plug leads - plugs - coil: first of all. As the gas pressure increases you need a higher voltage to create a spark, which is when plug caps etc start to break down.

I had similar symptons on my 100RS - took me ages to find the fault.

Regards to all

 

[Tobers]

At low revs & small throttle openings, only one plug from each cylinder fires.

As you open up, the 2nd plug in each cylinder comes into play. Sounds like you've got a loose plug cap, knackered plug or similar. Pop the plastic plug covers off, ensure everything is correctly seated, and see if that makes a difference. You can easily dislodge a plug cap if you drop the bike.

 

[GSmonkey]

Same happened to me. Sounds like secondary plugs or coils.