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.
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">
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