Property shrouding your Grand Axis engine is very important in keeping it run cool. Air cooled scooter engines highly depends on air from the cooling fan, the shroud forces the air around the cylinder and head keeping it cool.
Yamaha Grand Axis is a very popular Yamaha scooter in Japan but it never made it to the US. The Grand Axis swap is a very desirable swap for the Ruckus and Zuma 50cc.
