Thanks for your help with this.

What I've done today:

Installed a new battery.

Adjust the idle, and set the TPS to 17. I will check this again when hot and cold to see if there is any drift but it is new and replacing it didn't affect the running at all.

The idle is smooth - perfect.

Blocked off the AIS hose and air box port - made no difference.
I connected back up.

I ran the bike in the portion just above idle where I'm guessing it uses the map and it still misfires.

I added some fuel injector cleaner incase it's a dirty injector and ran for 10mins revving etc.

I sprayed contact cleaner around the carb and hoses - no rev change.

I adjusted the CO to 10,15,20,25. It ran much better around 25 but when riding it, there was little power.

I installed the old plug, the new one was slightly grey.

I don't think it's the tappets but I can't hear them so they could be too tight. I will check them tomorrow.

Could it be any of the following?
Coil, fuel filter, pump, injector, poor wiring/connections, ecu dry solder joints.

To recap: it only does it during the lower portion of the rev range and if you pull the throttle in quickly the engine responds well. It just intermittently stumbles when in the normal range of use.


Thanks,

Matt