Black Bull Manual
11
TENSION OF THE REDUCTION BELT DRIVE
USE CAUTION
Attention: a belt which is “over tensioned” can do permanent damage to the
bearings inside of the pulley hubs and drive shaft.
Therefore we strongly suggest for you to follow carefully these instructions.
Before adjusting the belt take a felt pen or marker and make a small sign on
the cam shaft and on the front of the reduction plate.
This is your Zero or start point and from here you will be able to clearly see
how much you move the eccentric tensioning cam in relation to the reduction
plate.
Remember “these are Fine adjustments” and we suggest not to rotate the
cam any more than 1 mm per adjustment.
After each adjustment you can try to start the engine and check the result.
If the engine does not start well then it usually means the belt is still too loose
and is slipping - in this case repeat the operation by tensioning the belt
another 1 mm.
Consider that if the belt slips a little, but the engine still starts fine, then the
tension is correct.
Belt tension always increases automatically when the engine is running
because of thermal expansion in the pulleys.
Once you have found the correct tension, do not adjust it any more.
In case of doubts please contact your paramotor dealer – or CORS-AIR.
