explanation of powervalve operation

[overbore]

I think its supposed to help low end and midrange,but dont
know how the subvalves open or when and when the main
opens so I can use for future troubleshooting.
Thanks for any responses.

 

[overbore]

anyone ever tear one of these apart or know how they work so
I will know for sure in the future or point me to a link.

 

[Kjetil]

I dont know on your bike, but on my bike (Husqvarna 250) there is a centrifugal device inside the motor that opens the valves at around 6200 rpm.

 

[overbore]

is open part way at low speed and full at wide open?

 

[Kornholio]

Here's an article giving details of powervalve operation for different bikes, hope it clears thngs up for you:
<a href="http://www.poetonaptec.co.uk/technica/mpcxvalv.htm">

 

[Kornholio]

Sorry, I can't edit my post, The hyperlink didn't work so just copy and paste this address into your browser:
http://www.poetonaptec.co.uk/technica/mpcxvalv.htm