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1. Install the 2-speed hub (68) onto the main 2-speed shaft (72). Secure the hub to the shaft by installing and tightening
a 4x6mm set screw (R). Note: make sure the set screw is installed in the straight hole of the hub. The other
hole is angled and is the 2-speed adjustment screw. Also, make sure the set screw lines up properly with the
flat spot on the main shaft.
2. Install the second 4x6mm (R) set screw in the angled hole of the 2-speed hub (68). Tighten the set screw until it is
snug, then back it off 8-½ turns. This is a base point to start from for tuning the 2-speed. Note: To make the car shift
sooner loosen the angled set screw. To make it shift later, tighten the set screw.
3. Install the small spur gear (64) onto the 2-speed housing (67) and secure the spur (64) to the housing (67) using a
split ring (66). Note: The spur gear keys onto the housing using a small pin. Make sure the pin in the housing
keys into one of the holes on the spur gear.
4. Install the large spur gear (63) onto the gear plate (65). Note: The large spur gear has 3 molded nubs that key
into the gear plate. Make sure these properly line up during assembly. Secure the spur gear (63) onto the gear
plate (65) using a split ring (66).
5. Install the large spur gear assembly onto the 2-speed main shaft. It should mate up with the small spur gear assembly
already installed onto the shaft (72). Note: The gear plate has a one-way bearing in it so the large spur gear
assembly will only rotate one way.
6. Install a 5mm washer onto the main shaft (72) and seat it against the large spur gear assembly.
7. Install the 2x10mm pin (40) through the main shaft (72) hole closest to the spur gears.
8. Install the small pulley (49) onto the main shaft (72). Make sure it keys onto the previously installed 2x10mm pin (40).
9. Install the belt guide (50) onto the main shaft (72), making sure it keys into the small pulley. Secure the assembly in
place with a 4mm e-clip (V).
2-Speed Assembly
