Check gas and oil. It idles fine and runs at high speed fine.

Karting
Go kart stalls when accelerating. Remember to use safety equipment such as helmets knee pads etc to make sure no serious accidents occur due to engine failure. Roto tiller on a go kart. But it stalls when you speed up the engine. The carb has been cleaned and the diaphram and spring replaced. 150cc 250cc and other buggy large off road go kart engines. What needs to be done on this engine.
Hammerhead 250cc bogging on acceleration. Jabo teamhog firebird81 pgh. 25 posts page 1 of 2 1 2. There is also a main jet adjustment screw dead center on the top of the carburetor. If you live at higher altitudes youll have to change the jets inside the carburetor. If you are careful how you accelerate it it will make the transition.
If the gas tank and carburetor do contain water it has be removed completely. If you let up on it and accelerate it again it dies over 90 of the time. You can look in the bottom of the gas tank and see water beading around if its present. In general always use a well functioning engine for your go kart and do regular maintenanceits very dangerous if the engine stalls when you are driving at a considerable amount of speed. Believe it or not this is a very common problem especially when people travel to higher altitudes. If the engine has water in the gasoline it will start run for a few seconds then as soon as the water hits the carburetor the engine will die.
Meaning they have the metering rod a part of the throttlecarburetor pushed down into the main jet which doesnt allow much fuel to go through. One of the most frustrating situations for a go kart owner is when they hit the gas to full throttle and the engine bogs down. This is frequently set at 1 full turn out. If this is not adjusted correctly your go kart may not run or run very poorly. Problems solutions complaints and tips. Once again turn screw all the way in clockwise and then out counter clockwise 360 degrees 1 full turn.
Hammerhead 250cc bogging on acceleration urgent by justykumbusty thu mar 06 2014 514 pm.