2. A Just K'NEX Racing Wheels pack, which contains:
2 x K'NEX Hub Racing wheel 50mm
2 x K'NEX Tyre Racing wheel 50mm
2 x K'NEX Hub Racing wheel 37mm Black
2 x K'NEX Tyre Racing wheel 37m
3. A K'NEX Spring motor
Note that the Spring motor has an arrow embedded in the plastic casing at the top (see below).
First, add to a blue rod:
1. A tan clip facing outwards.
2. A blue spacer.
3. The spring motor (you will need to push the blue rod quite hard to make it go through the hole in the middle of the motor)
4. Another blue spacer.
5. Another tan clip facing outwards.
Turn the motor the other way up, and push two white rods through the holes at the top of the motor, as shown.
…and attach it to the white rods as shown.
NOTE: The arrow on the top of the Spring motor must point away from the green connectors, towards the front of the vehicle.
Then add the two larger wheels onto the ends of the blue rod, so that the lug on each tan clip fits into one of the smaller holes in the wheel hub.
Now make the front assembly, by joining three light grey 2-way connectors together with a white rod, and then attaching a yellow rod to the central light grey connector, as shown.
Finally, complete the Racer by attaching the front assembly to the rear assembly, as shown.
You can test it as follows:
1. Put the Racer onto a flat smooth surface such as a tabletop.
2. Pull it along backwards for a least 1 meter (3 feet), so as to wind up the spring inside the motor.
3. Release the Racer, so that it runs forward at high speed (If your car will not run forward when released, you have probably attached the spring motor with the arrow pointing backwards rather than forwards - see "NOTE" above).
4. Test the Racer again, this time pulling it further backwards, until the spring motor starts to click, to indicate that it is fully wound up.
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