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Check the idling setting screw is not holding open the throttle butterfly common fault to fix if the engine races esp when no load is applied the idle throttlexpostion is to high thus the engine runs faster at idle turn the screw located on either the butterflyistelf so less screw threes is against the carb body this should start lowering the idle speed of the engine it should be around the 900 RPM approx for idling and top rev of 3500 at full throttle a rev counter is displaying a extra high rev count the it's the oil governed at fault or malfunctioning or sticking this will cause and engine to race badly to the point of engine destruction eventually You may need to adjust the movement of the governing leavers etcetera best done by qualified servicing personnel a lawnmower mechanic etc
Follow the air intake back until you get to the throttle body. the throttle position sensor is mounted directly next to the actual throttle spring linkage. should be about 2"long with a 2 prong shrouded connector plug
sounds like your throttle cable might be frayed or broken, when you pull the throttle and let go does it go back on its own? and can you here a clicking sound when you close the throttle? If you could send me pictures of the carb how every thing goes in and take it apart and take pictures, that would be helpful.
Sounds like it might be getting to much gas. What position is the choke in during all of this? If you're giving it throttle it may be flooding itself out.
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