Tag Archives: Rotor

Replacement Main Drive Gears for Firefly & Micro Mosquito RC Helicopters This is a replacement set of main gears for the Firefly or Micro Mosquito helicopter. Instructions for removal: 1. Remove the main rotors 2. Remove the two small motor gears (pinions) by prying them off with a small flat screwdriver, making note of which one goes on which side 3. Slide the old upper large main gear off of the shaft 4. Remove the C-clip that holds the old shaft in at the bottom by pulling the black plastic tab 5. Pull the shaft assembly up and out, or press it through from the bottom 6. Turn the shaft upside down and brace the tip on a hard surface 7. Pressing at the center, push the old lower large gear down the shaft, and remove it Installation instructions: 1. Slide the new lower main gear onto the shaft, aligning the “D” shaped hole with the “D” shaped top of the shaft 2. Brace the bottom of the shaft on a hard surface, and push the gear down until it almost touches the sleeve (there should be a room for the sleeve to move up and down a tiny bit, but not more than 1/32″) 3. The shaft can now be inserted into the body of the helicopter. 4. Clip the C-clip onto the bottom of the sleeve where it protrudes through the bottom of the helicopter 5. Slide the new upper large gear onto the shaft 6. Replace your pinion gears (the left pinion gear should mesh with the lower main gear, right pinion gear should mesh with the upper main gear) 7. Replace the rotors (lower rotor first with the notches down, meshing with the notches on the upper main gear, the spacers, the upper rotor, and the rubber capping tube)