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Right cylinder malfunction several test already done


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So I have a 2000 banshee that runs great on the left side but the right side seems to run fat. The plug is always really dark and has some oil usually on it pretty much fouls out. It also smoke more and has weak exhaust pressure on the right side . the left side is perfect. it’s bored Like 60 over has about 6 hours on the top end has Boisen reeds,new fmfs , jetting is 260 pilots 30 and elevation about 80-100 feet above sea level has the vitos machined air box mod that bolts to original air box with k&n style filter has tors deleted carbs from vitos as well.  Compression in left cylinder 135 compression in right cylinder 130-135 as well . Passes a leak down test. Everything is in sync what is the problem any advice please been going crazy trying to figure it out

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