Please note the 60W、90W motor, should use GU type gear. If the
60W、90W motor use GN Type, Will void the warranty. In the
original design, the 60W、90W Motor Frame Size 90mm should be
with GU type gearhead. Its gear life and strong more then
better GN type. GN type are design for the 40W Motor Frame
Size 90mm. But some client want to cost down for get better
prices, so they ask us to manufacture GN type for they. After
many years this situation become regularity. Even though we
did not agree, many people still do this.