Put it back together and ran it. I didn't see much difference. Maybe 300-400RPM. It is hot as hell here - right at 90 degrees and hovering around 70% humidity. The last time I checked the RPM on an APC 10x8 in this weather I think it was around 14,500-14,600 and I'm geting 14,800-14900. Not worth the trouble to do what little I did to mine. I have a Super Tigre G-51 with a ring that I plane to play with the exhaust timing on. Where can one get a degree wheel for these small motors? i didn't take any pics but my ports look a lot like iflyglow's earlier in the thread.