we've raced are cat at very small tracks using a 7.5 and a 6.5 we were running 83 x 20 22 on the 7.5, and 83 x 18 x 20 on the 6.5 yeah they get hot, if you wet your finger and put it on the motor if the water boils of straight away its to hot if it disperse slowly your OK,
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Mattys the driver,my names carl
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