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I have an 03 Merc 9.9 that will turn 4900 RPMs when the throttle is wide open. But, when the throttle is slightly backed off it will turn up to 5100-5200 which makes a significant difference in speed. I have played with the mixture screw with no luck thinking it may be running a little rich/lean. The motor is on a new skiff so I can't say it "just started doing this" and the boat it was previously on I didn't have a tach. Anyone got any idea what the issue may be, or if it is an issue at all? I would definitely prefer WOT to be WOT. Thanks for any input.
Brad
Brad