Hey, the ypvs is not working properly on my dtr.. When i start the ignition the pulley moves the valve as normal. Then i start the bike and the ypvs seems fine. The pulley is moving but suddenly it just stops?? It can stop at any time, after the first rev or after a short trip. 

I have tried to look after people having the same problem but it seems like people ypvs do not move at all or it works. 

I have removed the power valve, cleaned it so tjat it moves freely, i have adjusted the pulley cables (many times!) and i have opened the servo too see if everything is good. 

I have hear it can be the pv controller or the cdi, but these are expensive parts so is there a way to check if mine works or something?

Thanks

Seeing this more regularly I'm afraid, most likely your CDI. Only way to check is try another unfortunately

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