As i said, i got expérience with Rotax pv engines and it works very well.
That lead me to a question, i'm asking myself since the first time i came here on bhq:
Why there is not much power valves setup on Shee engines? What's the problem?
I was thinking of pv setup for my next engine built, but if almost nobody is able to make it work as good as on a snomow, i will scrap the project right away.