Hi John:

We have not seent this to date here in the US. Have you had a look at your fuel filter ? Please check to see that you have no air bubbles in the fuel delivery. Even the smallest air leak can not be spotted without close examination while running. If you have been thru the entire fuel delivery system and found no restrictions, air leaks, I would think it may be the RPM board.

Please contact Simejt at www.simjet.com and I'm sure the can help resolve.

Brg.