Update.

I've just had the powervalve casing off to check how the valve is actually opening etc.

It's seem to operate in sync with the throttle via the carb. It actually works quite well.

Does anyone know the position of the valve for wide open/full power?

I'll upload a video in a second.

Damn, seems I have no servo then. Do you know anywhere I can buy one?

How do I go about testing the CDI?

So, I just picked up an AR model as I've never seen one for sale here before (Thailand) and heard they were good rides. My primary concern is the powervalve, I'm used to 2stroke powervalves as I also own an NSR and a TZM and I've had them apart numerous times. However, I get the feeling this AR's po...