98 yz 250 power valve

[Yamaha fan number 1]

I have a 1998 yz 250 powervalve is not opening.okay so this is what ive done so far. 

Took power valve out and cleand/inspected it,    inspected govenor that operates power valve behind the clutch cover, inspected the arm the hooks up to the power valve that operates it. 

Everything looked fine and i can mover power valve with my hand just fine. It just dosent open on its own when reving the engine. Whats the next step. Thank u for any help. 

[Pigsfly]

Have you taken the cylinder off? The shaft valve may not be connected correctly to the shaft pinion, 11 and 14 

 

 

[scoobydoo]

37 minutes ago, CRJohnny said:

Have you taken the cylinder off? The shaft valve may not be connected correctly to the shaft pinion, 11 and 14 

 

 

wrong PV set up, that's off the later YZ250!