rev needle jumping

[colesyboy]

Hi all,

I'm pretty sure I should go and look at my Haynes manual on this, but I'll ask here first anyway.

Rev needle on 1150gs adv jumps around a lot, this is at idle and when I hold speed steady. It's bloody annoying at slower speeds as I'm sure that the bike jumps around along with it

It's starting to do my head in. I've just check the spark plugs, all nice and sand coloured at the top.

Any ideas / list of things to check ? The fuel filter was due for a change about ooooo ,some time ago. Could it be that?

Cheers fellas,

Brian

 

[Gecko]

Is it just the rev needle or is the engine speed changing too ? If it is you have classic surging. Do a search on cat-code plug , this will sort you out .

 

[Big Lad]

It's also a sympton of the hall effect sensor being buggered.

 

[colesyboy]

Ill check them both out, but how can I test for the hall sensor (luckily I have one spare from a trip).

Cheers

Brian