Re: yamaha g2 bogs at half throttle through full throttle
First, make sure the airbox is tightly sealed. Check the plastic spacer between the carb and the head for cracks. Is the fuel filter clean? There's one in the bottom of the fuel tank. Is plenty of fuel getting to the carb? Is the choke opening fully? Check the spark plug for a rich or lean mixture - black soot or wetness (not oil) means rich.
If these all check OK, rebuild, or at least dismantle and clean the carb.
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