Higher tyre pressure = more top speed via less drag, 1lb pressure rise will show an increase of straight line speed so going more than that can show significant rise in top rpm also depending on number of laps run a reduction in lap time. Both the Mojo D1 and D2 offer pretty stable performance after their initial peak performance first heat cycle and can work surprisingly well on some circuits at higher pressures. No need to 'go figure' it's already been done. One point to note, the Rotax is supplied as a leisure engine and is also viewed as such by them hence originally supplied with a thermostat which we all ditch at the first opportunity for the very reasons I stated previously.
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