SG250 Owner’s and Service Manual
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Prior to lifting the bike to get the wheel with the flat tire off the ground, loosen the axle bolts (just
loosen them, do not remove them). Note that the photos shown in this section of the Service Manual
are photos of the RX3 motorcycle. The concepts are the same for the SG250 motorcycle.
Remove the wheel with the flat tire in accordance with the instructions for doing so in this Service
Manual. Place the wheel on its side, with the brake disk facing down. Remove the valve cap and
depress the Schrader valve to allow any remaining air in the tube to escape. Loosen the nut around the
valve stem, and then unscrew it completely by hand.
Break the bead around the tire. You only need to do this on one side of the tire. Usually, just stepping
on the tire (as shown below) will unseat the tire from the rim. After you’ve broken the bead, spray the
area between the bead and the rim with a rubber lubricant designed for tire mounting.
Using a tire iron (you’ll need two), insert the tip between the tire and the bead, and pull the bead over
the rim. Using the second tire iron, pick a location about 6 inches away (measured circumferentially on
the rim) and do the same thing. Remove the first tire iron and repeat the process. You usually only
need to do this once and the tire will pop off the rim on the side you’re working. You do not need to
remove the tire from the rim; you only have to get it off the wheel on one side.
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