You need to put the spacers provided in the kit between the sevo mounts and the car this stops the servo horn rubbing on the chassis
the biggest pinion you can run on the cougar is 23 t due to them having a differnt internal gear ratio i curently use 22t pinion with the stock spur and 6.5t motor
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LOSI 22 - SPEED PASSION 6.5 - ORCA VRITARA PRO - SAVOX - Spektrum DX3R 
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