Step 7: Install the freewheeling crankset.
(photo 7)
Install the left side crank arm and the
freewheeling crank and chainring as-
sembly on the right. Tighten bolts firmly
so that both arms are pressed onto the
bottom bracket axle as far as they will
go.
It’s important that the right side crank arm is
firmly seated onto the BB axle for correct align-
ment of the motor drive chain.
This step involves putting the drive chain onto
the small chainring, and installing the Return
Chain Idler in one of the two optional place-
ments. The purpose of the idler is to route the
return side of the bike chain around the gear-
box. In the photo shown the idler is in the for-
ward position. This is the desired position, but
depending on the bike you may have shifting
problems and need to place the idler in the
rearward position.
As it will be hard to tell which position will
work best during installation, put it in the for-
ward position to start with, and then change it
if there are problems.
Step 8: Install the motor chain and align
the gearbox sprocket to the chainring mo-
tor sprocket.
Install the motor chain using needle
nose pliers.
The gear box rolls easily in one direction, insert
the chain and roll it around the sprocket and
through to the other side. Now wrap it around
the motor sprocket and bring the ends together
with pliers as shown. (Photo 8)
The ends attach by inserting the 2 pinned link,
covering it with the small plate, and then con-
necting them with the clip that should seat
firmly into the pin’s slots. (Photo 8)
Align the motor chain.
Sight down the line of the motor chain, and use
the red tertiary plates’ set screws and adjust-
ment bolts to straighten out the line, where it is
not going to rub against either chain-ring
guards, and will give the best power transfer possible. You may want to use a thin straight edge, such as a
(7) Installing Crankset, Drive Chain, and
Return Chain Idler
