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Will a 91 kx250 motor fit in 98 frame?

No, a 1991 KX250 motor will not fit in a 1998 KX250 frame. The 1998 KX250 frame was designed for the 1998 KX250 motor, which is a completely different design than the 1991 KX250 motor. The 1991 KX250 motor is a two-stroke engine, while the 1998 KX250 motor is a four-stroke engine. Additionally, the 1998 KX250 frame is made of aluminum, while the 1991 KX250 frame is made of steel.