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superduke forum • View topic - Bike misfiring at high revs

Bike misfiring at high revs

problems . solutions . product reviews . tips
User avatar
TimR
Two wheeled terror
 
Posts: 331
Joined: Fri Apr 11, 2008 11:36 am
Location: Stockport, UK

Bike misfiring at high revs

Postby TimR » Mon Aug 26, 2019 7:51 am

Morning Gents,

I'm having an issue with my bike, its a 990 with about 27000 miles on the clock.

Regulator/rectifier was replaced about 2 years ago with a mosfet unit. Throttle bodies were replaced last year and Power Commander removed. Since then the bike has only done a few hundred miles.

I took it out yesterday for the first time in a couple of months. Its been garaged and on a trickle charge It starts OK and tickover is steady. It runs smoothly up to about 7000 revs in low gears, then seems to misfire at around 7000 revs. At first I thought it was hitting the rev limiter. It struggles to rev through to the 9500 rev limiter. It doesn't seem to do it in higher gears (although I haven't figured out exactly in which gears the problem does and doesn't show). With the clutch pulled in it also misfires from about 7000 revs.

There are no fault codes showing with the FI light but I don't have TuneECU.

Any thoughts on what could be causing the problem?

User avatar
No. 47
Master of the twisties
 
Posts: 3096
Joined: Sat Jan 10, 2009 5:14 pm
Location: London and Kent

Re: Bike misfiring at high revs

Postby No. 47 » Mon Aug 26, 2019 8:57 am

'Starter for ten' - fuel filters, fuel pressure and ignition coils - have replaced latter a few times, no fault code, but casing can crack and faulty at high revs and/or high temp only.
'08 ex-Battle race KTM Superduke 990 R No.47
'08 OE KTM Superduke 990 R
'01 Ducati 996S

User avatar
nampus
Stunt rider
 
Posts: 802
Joined: Thu Nov 04, 2010 4:24 pm
Location: The Netherlands

Re: Bike misfiring at high revs

Postby nampus » Mon Aug 26, 2019 3:30 pm

+1 on fuel filters!
Toptip, don't get the ktm filters, they are way overpriced.
Get them on eBay from Greece.
It's a guy from the advrider forum who sells them.

cakeman1
Minimoto racer
 
Posts: 7
Joined: Fri Jun 07, 2019 1:34 pm

Re: Bike misfiring at high revs

Postby cakeman1 » Mon Aug 26, 2019 3:36 pm

+2 on the fuel filters

User avatar
TimR
Two wheeled terror
 
Posts: 331
Joined: Fri Apr 11, 2008 11:36 am
Location: Stockport, UK

Re: Bike misfiring at high revs

Postby TimR » Tue Aug 27, 2019 8:44 am

Thanks for the replies chaps 8)

My first thought was maybe ignition coils, but I'll start with checking/replacing fuel filters.

Be prepared for a series of dumb questions, for which the standard response will probably be "use the search button" :lol:

I'm in danger of falling out of love with the bike. I haven't looked forward to riding it all summer and things seem to be going wrong on a regular basis. Hopefully getting this resolved will rekindle the affair!

User avatar
Linga
Wheelie king
 
Posts: 1478
Joined: Sat Mar 05, 2011 4:10 am
Location: Perth, Oz

Re: Bike misfiring at high revs

Postby Linga » Sat Oct 05, 2019 4:48 pm

Also check your earth. I had an issue with this and was just a slightly loose earth.

And a fuel filter one time also





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