chinese ratios


New Member
Local time
6:09 AM
Aug 17, 2008
Richmond VA
So after 3 days of obsessively reading this forum I have myself totally confused! I feel like I remember that happytime/goodtime/chinese engines have a built in gear reduction of 4:1? I have searched for confirmation on this but am coming up empty. Maybe my search skills are lacking. My original plan was old weedwacker which could work great for friction, but I want to go with chaindrive so I'm trying to find something that I don't need a jackshaft, 200 tooth cog, or expensive gearbox to run
You don't need 18:1 in a primary gearbox. 4:1 or 5:1 in a primary is more than enough and even the 3:1 could work with a bit of creative fabrication and parts sourcing. The problem with most of the inexpensive reduction boxes available that fit the weedwacker motors is the fact that they reverse the rotation of the motor. The gearbox shown in the thread I linked to does not reverse rotation. The output at the gearbox is CCW just like the motors.