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Sounds like your governor linkage and or governor control fan arm " most small engines have them to control over speed" is binding or maybe has dirt and grass built up.. Or the return spring is disconnected. Once it starts to race manually move the governor linkage back an let go see it it stops racing.. Then release if it races again..check the spring if connected...you must check the governor fan it is located under the top housing..it uses the engine fan calling air to slow the engine when over speed occurs by pushing the governor linkage back to slower speed.. Check it out...good luck..
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
1. Second event is a Dragrace, which will require you to push additional button to shift gear up or down "check your controls for configuration" to avoid blown engine sticking on gear 1. as you can see while accelerating the speedometer rises before it reaches the red boundary shift gears up to avoid blown engine.
Another simple race. Be sure to avoid the truck that'll appear on your left (#1). You won't have much time to make a correct manoeuvre. Be sure to change lanes often. use Mitsubishi Lancer EVO VIII its handling is good on tight corners an also fast.
The carburetor settings should be to make the engine run correctly, not meet some specification. The upper jet is for idle adjustment and the lower adjustment is for high speed running. It the lower jet is too far CW, the engine will be running lean and tend to miss. Too far CCW and the engine will run 'muddy' and tend to blow black smoke from the exhaust. Throttle speed is determined by a balancing act between two springs, the governor, and the throttle position. Generally, there are several options for spring placement--a series of holes drilled in the throttle arm and the governor arm set this balance. Have the springs been replaced? Have you tried a fresh spark plug? You may require professional assistance on the throttle adjustment. Hope this helps!
Hello assuming there were no carburetor jet changes and your bike is running to rich. or you have realy dirty air cleaner. Fouling plugs due to to much oil could be the wetside oil seal needs replace because it is letting your trans oil enter the crancase or you have worn crankshaft roller bearings.