1. For easier access to the accessory drive belt, remove the air filter (see «Removal and installation of the air filter housing and intake silencer»).
2. Turn the tensioner roller clockwise with a wrench until the belt tension is loosened...
3.... and remove the accessory drive belt.
4. Install a new accessory drive belt in the reverse order of removal.
Warning: Lay the belt over the pulleys so that the inner grooves of the pulleys remain free.
5. Turn the crankshaft at the crankshaft pulley bolt three full turns to ensure that the accessory drive belt is in the correct position on the pulleys.