1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 187Get this manual
REAR WHEE LBRAKEDRIVE MECHANISM Screw in the breaker arm compressor bolt to break the bead from the tireIf the fest of the bead cannot be pushed down into the center of the rim, remove and reposition the compressor and arm 18 to 1 the circumference of the rimTighten the compressor bolt to break the beadRepeat this procedure as necessary until the rema inder of the bead can be pushed down into the center of the rimIf the bead breaking is dificutt with the narrow end (A sidel of the breaker arm, use the wide end IB side) of the arm and repeat the procedure aboveWIDE END (B SIDE)