You need to adjust the governor arm to the new carb.
GOVERNOR ADJUSTMENT CONTROL DISC , THROTTLE WIRE �� BUSHING N UT Arrow indicates direction to move bracket to decrease speed. GOVERNOR COMPONEN TS GOVERNOR - ARM The governor functions to maintain engine speed under changing load conditions and also acts as a speed limiting device. The position of the throttle bracket determines speed range of the engine (ar row indicates direction to decrease speed). The hole in the control disc into which the throttle cable is inserted is also important as this establishes degree of governor control. It is a good idea to permanently mark the exact position of the throttle bracket (scribe mark on crankcase) and also the control disc hole in case linkage becomes disconnected or bushing or arm retaining nuts work loose. If this is done, the governor can be quickly reset to original position. Initial Adjustment: This is made (with engine stopped) as follows: Loosen (do not remove) governor arm retaining nut, grasp end of cross shaft in pliers and turn in counterclockwise direction until shaft stops internally. Hold cross shaft in this position, then pull governor arm all the way away from carburetor (with updraft type carburetor, lift arm as far as it will go) and retighten arm nut to complete initial adjustment. Cable Installation: If throttle cable becomes disconnected, use following procedure: Bend end of throttle Wlre exactly as shown in inset--if carelessly hooked or looped, wire will bind on control disc and cause poor governor- action. Move throttle control handle to open position then insert wire into control disc hole nearest to throttle bracket. Speed Adjustment: After readjusting governor, restart engine then move throttle to open position and check top speed with hand tachometer. Maximum permissible speed for K91 is 4000 RPM while for most other models it is 3600 RPM. To decrease speed, loosen bushing nut and move throttle bracket in clockwise direction. Retighten bushing nut after adjustment (Do not overtighten--this could cause binding of the cross shaft).
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