Home › Forums › Tech Talk › 11t Sprocket Failure – Rotax Max F125 › Reply To: 11t Sprocket Failure – Rotax Max F125
The nut is the same whether you use an 11 or a 12.
When you run the 11 you remove the o-ring and switch to a smaller outer washer. You can put a dab of grease on the bushing but they will always be a little noisier than the 12.
Also, avoid cheap aftermarkets, never had a failure with OEM sprockets.