02 cr250 power valve question (trouble shooting)

[rbigair40]

the valve does not move when it is revved?  how can i test it ?  it has a new cylinder just put on with clean valves new piston started bike let warm up and revved it to make sure they worked ? they didnt move it has the rc valve on it (electric)

[ford832]

I'd just drive it.If the power is flat mid and up,it likely isn't working.You may not be able to test it by revving it on the stand-I know my RZ wouldn't and it was electric,and worked fine.

[SachsGS]

In the case of the Yamaha DT/WR 200s with a servo motor controlled powervalve,the servo motor would go through a "reset cycle" when you first started the bike.I'm not sure if the 02 CR250 is the same but it might be something worth checking.

[bearorso]

If you haven't got a manual, find one. There's a heck of a lot more to these than your std, run of the mill, ball and ramp PV system.

It could be anyone of a few mechanical assembly issues, and / or electrical issues - TPS working / unconnected -  wires loose/unconnected at anyone of a few points, through to simple maladjustment of actuating cables.

There's something wrong if it doesn't open and shut when on the stand and revving it. I only know this by seeing them actuate in that setting - I've been back on a non PV 2t for the last 11 years now, I think I'd probably re-assemble even the most simple PV mechanism the wrong way nowadays.........