I'm running my H2 rear mount in the stock 17.5 class and I'm struggling for top speed. Running a Speed Passion motor car just seems to run out of legs halfway down the straight. Using the stock spur with a 30t pinion. If I use a bigger pinion the motor becomes to hot and it lacks low down punch to get over the double jumps. Guys in my class with the Losi 22 and the same motor seem to have more low down and more top end punch
