Tore into the motor of this little APC Edge 90cc ATV. This motor is very basic, with no reverse and no actual gears to shift. After pulling the motor apart, it looks like this motor only has one drive gear. There's no gear shifter, no gears with dogs on them or anything like that. Any idea where I might find the smaller 17tooth drive gear for sale? My apologies in advance...I'm not 100% sure what this gear is actually called... Thank you!