i ran with 5.5 novak with my old b4 ft. was std. spur (84t am i correct) and ran with pinions between 18 - 21tooth. we cant really tell you what pinion to go for as all tracks are different. and require differnt gearing. i manily ran with 18tooth pinion on standard spur with throttle turned down and top speed turned down on the transmitter
the reason for the overheating is that you played about with your esc. if you put more brake on the esc, it has to work harder and generates more heat, causing it to cut out (so you dont blow it up). 7minutes ?? thats surley long enough?
reset your esc to factory settings and try from there
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