I have this too - mine due to small airleak at front pipe to head
connection. Check it when bike cold, day cold & on choke and you'll
see the exhaust mist. I ignore mine.
Mike

On 02/03/2009, graham.sibbert@...
<graham.sibbert@...> wrote:
> Hello all.
>
> Had some good feed back from you all about meing a new rider so will
> ask another question.
> My bike is 1999 vintage with 30k on the clock and runs very very well,
> I have ironed out the jerking throttle which as you all suggested was
> my own riding fault.
> However, I now have a back firing situation. I can just hear it when I
> throttle off approaching a roundabout, junction, long hill etc and at
> one point it was a definate back fire.
> Is this normal or do I need to start checking things out or give the
> bike back to the selling dealer to sort.
> I am returning around 170 miles to the tank which is better than my
> last bike.
>
> Graham.
>
>