Rotax Gear Sprocket
Pinions sized 12-13-14 use a bearing in the gear:
Rotax Clutch Bearing - 12T – Overdrive Motorsports
If purchasing the 11T Sprocket please note that the bearing will not work and you must use a bushing as follows:
RO Clutch Bushing 11T – Overdrive Motorsports
If using a bearing for pinions sized 12-13-14 please use the larger outer washer in the drop down menu so that the gear doesn't slip off. If using a bushing and 11 tooth pinion please use the smaller outer washer so that the chain doesn't make contact with the washer: