Biggest tips I can give for our track are as follows
1) The majority of the tight corners are all about braking hard and late inside what would be the normal rotax racing line. We have a lot of tight corners that can be almost impossible to carry smooth speed through while balancing braking, gas, and shifting ( you will get lots of hop). So the quick way through is to go hard and late on the brakes, one quick turn towards the apex, then stomp on it for a great exit.
2) Put your brake balance to the front... I run 90-10 or so... some other guys may not be quite that aggressive, (but either are their lap times Nigel

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3) With the 17/27 gearing the shifting will be pretty obvious to you, never let the kart bog, if you can't carry the speed to keep it in the power band, make sure you go down an extra gear. Turn 1 is 4th gear for me, turn 14 is 5th, both of the hairpins go down to second, the other tight ones around the bull bag 5/7/8 are 3rd, 9 is 4th.
4) My biggest piece of advice, is get your self in shape and push hard. If you aren't coming off the track dripping wet after 10 laps you are taking easy and you will be slow. Our track is extremely physical and you need push hard to be quick. Coasting on the gas, braking early, not hitting curbs are not going to get you up to the pace.
Nathan