With the ear removed and the engine
TURNED OFF you can use
your - finger to reach in and check for fan belt tension and or
inspect for damage or wear.
An improperly tensioned or worn fan belt can result in a
loss of horsepower and overheating. A belt that is too tight can
result in incorrect ignition timing! Which could lead to engine
The Rotax maintenance
schedule suggests the belt be checked every 25 hours of use.
To adjust the belt to the proper 1/4" deflection at 5 lbs
pressure as per figure A use the Rotax fan wrench tool 876 -
357 and the socket wrench supplied in your tool kit part #
876-210 to remove the nut, lock washer, fan, and fan protector.
To tighten the belt remove
shims from between the two fan halves. On new engines these
shims are placed behind the back fan pulley #8, on older model
engines they can be placed under the lockwasher.
When reinstalling the fan and
tightening the nut turn the fan over as you tighten down on the nut, or
you will catch the belt, which could damage it.
Once you have the nut snug
use the fan wrench tool to lock the fan while you torque the nut to 40 ft.