Bike spluttering when revved

[ollienotts]

Hi guys,

My bike has been doing this for a couple of weeks now but it's getting more common. Basically, when I give the bike a little rev (I mean flash the throttle I.e when downshifting) the engine splutters and doesn't rev properly. The spluttering noise sounds like its coming from the manifold area rather than out the end can.

It doesn't do it all the time and when it does, I flash the throttle again and on the 2nd or 3rd attempt it sorts itself out, and it doesn't do it all the time, just every now and again.
As I said, it only does it when flashing the throttle when the clutch is in or the bike is in neutral. When revving slowly, doing prolonged throttle or whilst in gear there is no problem.

I haven't noticed any other noise coming from the manifold other than this coughing sound. My initial thoughts were fuel filter needs replacing, but cos the sound is coming from the front of the engine I thought it could be something else - air filter? Fuel pump? The manifold itself?

If anyone could enlighten me further on what the problem could be that would be greatly appreciated.

Cheers in advance!

[Daniel Cain]

From my limited experience, my bike did something similar. Was told it was a compression problem and it turned out to be a dodgy fuel tap and a leaky gasket on the engine, but not 100% where as I got a dealer to sort it as the bike is still under warranty.

Hope this helps somewhat......
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I hear voices in my head. They council me, they understand. They talk to me.

[Rogerborg]

What bike, what condition, any recent servicing (air filter changed / cleaned / full of hedgehogs), spark plug colour(s)?

Workshop .
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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

[Atomic Punk]

What he said ^^^^^ plus check for holes, gaps in the exhaust.
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I may have lost my way but I'm way ahead of schedule.