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Guys, Finally got the 600F3 put back together last night. Based advice from people here, I've raised the compression from the 8:1 I started with to 10.5:1, and noticed a major increase in performance. Also found that the jerks I had degree my cams were way off. Anyway, it revs a lot faster and comes on boost much quicker. It's driveable now, but not perfect yet. I am still struggling with a lean backfire (I think) when I let off the gas. I am blowing through the stock CV carbs and am getting real close on the mains and needles, but I still get a pretty mean pop (usually just one bang) out the exhaust when I quickly let off the gas. Anyone experience this, or have any suggestions on getting around this? thanks, Dave.