Bike almost dying when coming off revs

rubyhorse2 · Traffic Copper Joined: 03 Mar 2015 Karma :

bike has a strange fault.

Recently the bike feels like its bogging down when coming off revs. It has also cut out twice and struggled to start again, managed to start it but had to keep the revs up so it didnt die on me.

Was fine when i got home, admittedly i havent been letting it warm up enough before setting off so might just be this but feels like more.

It feels like fuel starvation, like it is about to die, but mostly happens when coming off the revs, even if i sit with it in neutral and blip the throttle, as the revs drops it sounds like its about to die but then sorts itself out.

Now, this could be due to letting it almost run dry of fuel?
Spark plugs?
It starts fine and runs fine, maybe just not letting her warm up?

any advice welcome, its a 08 superduke r

thanks all

Jefr0 · World Chat Champion Joined: 29 Jul 2007 Karma :

Exact same thing happening to me lately, except on my CBR 600.

I'm blaming spark plugs and have ordered another set, they are due anyway.
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Rides: Honda XR 125 ('03) Honda CBR 600F ('91), Ducati 916 Biposto ('95)

Vincent · Banned Joined: 16 Oct 2006 Karma :

If it doesn't do it when warmed up, I wouldn't worry too much.
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Space Is Deep

rubyhorse2 · Traffic Copper Joined: 03 Mar 2015 Karma :

was thinking plugs, will get some anyway.

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

rubyhorse2 · Traffic Copper Joined: 03 Mar 2015 Karma :

i havent done anything since buying. It came with akra's, all the usual mods done, ie sas removal etc and its got a power commander fitted.

Its been fine till recently.

weasley · World Chat Champion Joined: 16 Oct 2010 Karma :

How's the warmed-up idle speed?
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~~Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT~~ | BMW F900XR TE

rubyhorse2 · Traffic Copper Joined: 03 Mar 2015 Karma :

To be honest its only happened on a few occasions, as i havent used the bike that much recently.

Once its warm it seems fine. I did test the throttle blipping once home last night and it does sound a bit 'eurghghgh' when releasing the revs.

Idle speed is fine both cold and warm, it seems to be when its been under load and then released.

Going to change the plugs anyway.

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

First thing I'd do is give it a spanking and then change the fuel.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

rubyhorse2 · Traffic Copper Joined: 03 Mar 2015 Karma :

hmmm got to admit i've only used it about a dozen times in the last month and all for short journeys.

I'll do that roger, already ordered the plugs but no harm having some new ones in anyway.

what do you think is causing it though?

rubyhorse2 · Traffic Copper Joined: 03 Mar 2015 Karma :

well took her for a short blast last night and all seems fine, makes me wonder if it was because i let her run almost dry, possible crap from bottom of tank issue?

for some reason i like to play that game of how close to empty i can get, dont ask me why, the only loser is going to be me. I shall stop this game from now on Smile