Honda CRF50F Owner's Manual page 106

Tires & Tubes
Inspect carefully for bumps or bulges in the
side of the tire or the tread. Replace any tire
that has a bump or bulge.
Look closely for cuts, slits, or cracks in the
tires. Replace a tire if you can see fabric or
cord.
Check for rocks or other objects embedded
in the tire or tread. Remove any objects.
Measure tread depth ( ). Replace the tire 1
before depth at the center reaches 0.12 in
(3 mm), or any time you notice a reduction
in traction.
Check the position of both valve stems. A
tilted valve stem indicates the tube is
slipping inside the tire or the tire is slipping
on the rim. See your dealer.
98
Servicing Your Honda
Tube Replacement
If a tube is punctured or damaged, you should
replace it as soon as possible. A repaired tube
may not have the same reliability as a new one,
and it may fail while you are riding. For
information on making a temporary repair, see
page 124 .
Use a replacement tube equivalent to the
original.
We recommend that tubes be replaced by your
dealer. Replacing a tube requires removing and
reinstalling the wheel. Any time a tube is
replaced, carefully inspect the tire as described
on page 97 .