Lubricate entry with small amount of 2 stroke oil helps.
Having read that back,..am I on the right site?

That 2nd set of symptoms you posted sounds like you may have a blocked breather on the fuel tank. Best to check this before stripping carb cos its easy to do.
as you lower the fuel over 20 minutes riding a vacuum creates in the tank and stops the fuel flowing fast enuf to the carb. When this happens ...

Tried that Gwynn but cables all OK. If i twist the servo motor by hand valve opens and closes.

Hi all, I just bought an AR and there's a PV problem. It doesn't open as the rev's rise.
If I open it manually and then start the bike , the bike shuts it automatically but as the revs rise it won't open again. Do you think this is a computer problem (if so why does it still know to shut the valve ...