Here's a long shot (since you didn't say what oil you were using). I had a similar problem with my Brison 3.2. Turns out it was the synthetic oil coming out of solution and coating the carb passages making it a little leaner each flight until you just couldn't get it to work. Went back to non synthetic oil and all problems disappeared. Seems that the oil doesn't mix well with SF Bay Area blend of "clean" gas. You can see the thread on that here - http://www.rcuniverse.com/showthread...hreadid=117976

Good luck.

Halll