Get the revs up to around 9500 and hold it there. When the red light comes on let out the clutch so it *just* starts to engage (the revs will drop), and balance that with a shade more throttle. As soon as the light goes out you let the clutch start pulling and a tiny split second later open the throttle wide open and hold it there. Then slip the clutch keeping the revs over 10,000 but getting as much pull as you can , until the thing is banging off max revs and letting out the clutch doesn't drop the revs (i.e. fully engaged), be ready for this because you must immediately bang second gear and it will happen suddenly.
You will ride the clutch a loooong way if your gearing is right. If you've got a stock MC28 gearing 1st is not so long and it'll be different.

It is really important to practise your racing starts, it can be very important for the race, and it is very common that people don't ever practise them. If you can find a place to do it, just a half hour done a few times will vastly improve it. Also in the ACTUAL race bear in mind that you must conentrate not to dump the clutch and lift the front off the line. This is the classic first-time racer mistake, I've seen it happen so many times, but on the 2-stroke it's less of a risk.
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-