Here are a few images of my first motorized bicycle build. It would have been a lot cheaper to buy a kit but nowhere near as much fun.
Bicycle Specifications:
• Frame: Raleigh Venture 3.0 Hybrid
• Rims: 26” Velocity Psychos (36 hole)
• Hubs: Velocity ATBs
• Tires: Schwalbe Marathons 26 x 2.0
Drive Specifications:
• Engine: Honda GX35 4 stroke with a GX31 piston
• Gearing: Double reduction with a ¾” “L” type, timing belt primary (18 tooth pulley at the motor/70 tooth pulley at the transfer shaft) and a #35 chain secondary (12 tooth sprocket at the transfer shaft and a 60 tooth sprocket at the rear wheel)
• Mounting platform: ¼” aluminum plate with ½” x 1” aluminum tube support frame.
The top speed on flat ground is around 27 mph. Since I added the GX31 piston I have more low end torque so I may increase the number of teeth on the small secondary sprocket from 12 to 14 which should give me a cruising speed closer to 35 mph. According to the local police my first drive gear configuration reached speeds of 37 mph. I slowed it down to try to make them happy. Since it doesn’t look like I will ever make them happy I think I will kick it back up.
Bicycle Specifications:
• Frame: Raleigh Venture 3.0 Hybrid
• Rims: 26” Velocity Psychos (36 hole)
• Hubs: Velocity ATBs
• Tires: Schwalbe Marathons 26 x 2.0
Drive Specifications:
• Engine: Honda GX35 4 stroke with a GX31 piston
• Gearing: Double reduction with a ¾” “L” type, timing belt primary (18 tooth pulley at the motor/70 tooth pulley at the transfer shaft) and a #35 chain secondary (12 tooth sprocket at the transfer shaft and a 60 tooth sprocket at the rear wheel)
• Mounting platform: ¼” aluminum plate with ½” x 1” aluminum tube support frame.
The top speed on flat ground is around 27 mph. Since I added the GX31 piston I have more low end torque so I may increase the number of teeth on the small secondary sprocket from 12 to 14 which should give me a cruising speed closer to 35 mph. According to the local police my first drive gear configuration reached speeds of 37 mph. I slowed it down to try to make them happy. Since it doesn’t look like I will ever make them happy I think I will kick it back up.