Surging under acceleration ?

[KEV7801]

Hi Guys,
I have a 2003 1150GS ADV (Twin Spark). The bike has a Remus Revolution and Y piece, BBR chip, K&N element filter, NGK Iridium plugs and the bigger tubes from the air box to the injection.
It has just started surging under acceleration and also when sitting at 70-80 mph. Any ideas what is causing this ?
Cheers Kev

 

[DutchBryn]

I've only experienced the dreaded surging after setting valves / end-float.
It didn't do it before my handy-work (so it was clear I'd made a bollocks of it).
Repeated. More care/time etc. Surging gone.
Seems it really is the case that you not only have to get clearances within spec., but to match each other.

That said, mine's single spark...

 

[KEV7801]

I may have found the problem in another thread. There seems to be a common problem with the coil sticks ? I will investigate...

 

[Comfy Old Boots]

HT leads too.

 

[KEV7801]

Job done, new stick coils from Motorworks have cured my problem. Originals where badly corroded !
WELL DONE, THE FORUM DOES IT AGAIN....