6.67 sounds overall I think is going to be over geared and will cook your motor. My recommendation is 81T spur and a 26/27T pinion giving around 8ish overall. My lad last season ran a D4 with a 20T motor 80T spur and 24/25T pinion. Overall ratio was about 8.
Remember Yoda's advice...."over gear if you must, toast your motor will be. Hmmm"
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