I've ran my XX with a 7.5 and Lipo indoors with no problems, had a hydradrive fitted too which seemed to stand up ok. A xx is pretty light by modern standards so a 8.5 would probably be better. If i remember right the idler gear used to be the weak link in the gearbox.
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Speed Matters
Friday Night Buggy Racing nr. Milton Keynes - TCRCMC
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