hey adstomko
first off have you got a kart or engines yet???
to answer your questions its 310ml shell oil to 5 litres of fuel...ive always been told to stick to shell fuel if possible. you can run less oil...ive known people to go down to 250ml to 5 litres....basically the less oil, the more faster you can go.....but run it too weak and youll seize the engine, so to start with stick with 310ml oil until your up to speed. carb setup go for 2 1/4 on the low jet and between 1/8 and a 1/4 on the high jet
in terms of sprockets in seniors we ran 80 at hooton and 71 at 3 sisters, juniors will be about the same but you might want to add a couple of teeth until your up to speed to help your lad out in the corners
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