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    Valve rework and startup of 2004 Yamaha F90

    Have changed all 8 intake valves, and lapped all exhaust valves. Cleaned all four carbs without adjusting floats. Assembled, aligned marks on cam gears as shown in manual, set #1 at TDC, and flywheel at mark on block. Started up and idles nice. But above 1200 Rs, it either chokes out and dies or...
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    F90 2004 Yamaha outboard

    Man, this is a challenge. 137 FT. lbs on the fly nut is tight. Looking for holder or will build one. Need to change belt. Short story: Dirt dobbers nested on the cam gears and at first crank, bent all eight intake valves. Motor has less than 100 hrs. Have replaced with new ones after lapping...
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