67Dart273 said

Cuda, he has a point. If tommy has a 3 groove lower sprocket, you MUST be careful that you used the correct timing mark on that sprocket

I don't know whether the one below is bb or sb, but notice that you go by the simbol on the key and if you are using that key, they us use the corresponding timing mark

In the photo you can see the near key has a "O" and there is an "O" mark CCW from the key. Around the "bottom" you can see that key has an "A" and that there is a corresponding "A" further along.

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