• Low fuel pump pressure. Should be 4.5 lbs prox. Check your motors manual for the exact pressure required.
• Kink in the fuel line before the fuel pump, or between the fuel pump and carburetor.
• Spark plugs and/or plug wires may need replacing.
• Fuel filter may be plugged. Check for an inline filter and a filter in the fuel inlet of the carburetor.
• Vacuum leak. Lack of power can be too much air, or not enough fuel.
• Float may need adjustment.
• Move the float up and down by hand to see if there is any binding or catching.
• Does the needle come out of the seat easily. The viton tip can get swelled and stick closed with the lousy gas we have these days.
• Had the carburetor been sitting for months. If so, then the gas probably turned to varnish and coated the inside of the carburetor causing restriction in the small passages. Clean the carburetor and replace the parts in our rebuild kit.
• Power piston may be frozen. The power piston moves to let extra gas through at higher speeds. The piston moves using vacuum and can get stuck easily.