I run a 7.5 motor with a 78 spur and 25 pinnion good top end on long straights but have to add a bit of punch out of the corners! 
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Chris
TeamC TM2, TC02EVO & TM4 Abisima, Savox and Orion
Lazer ZX5-FS2, Rudebits DB1, Powered by Orion R10 and all Steered by Savox (and blind luck!).
KoPropo EX10
Kyosho MP9 , OS Speed
Paint by Magoo
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