i run a checkpoint 10x2 and it is a great motor. very fast, plenty of grunt and doesn't need too much maintenance.
Obviously it depends on your ability as to what you can handle. If you are going to be at an unfamiliar track and haven't been driving long then it may be better to run a 19t spec motor in the first few races and see how you get on. If you are in control and feel you need more speed then maybe move up to something like a 12x2.
The 19t may feel slow but if you compare lap times i guarantee you will be virtually as quick with the 19t, but more importantly you will probably have less mistakes meaning less marshall time.
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