Noob builds hybrid 49cc gas+ 2000 watt electric Felt MP. I tried my best.

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This bike is a project/ordeal I started about 6 months ago. Originally a 2012 Felt MP beach cruiser , this bike had the gas motor installed and a few months later the electric hub was installed. Bike is capable of operating by pedal, gas or electric or all three at once. The electric hub provides the torque and the gas motor provides the top end speed. A 50 tooth rear sprocket gives the gas motor a top speed of 35-40mph with a 200 pound man in the seat on level terrain. Top speed for the electric hub alone is 25-30mph. When both motors are used simultaneously, it is capable of climbing the steepest hills without pedaling and able to pull away from a dead stop at car speeds. I wish the gas engine fully recharged the batteries on the fly but it does not. It does, with brake regen and gas motor running, extend their range by over 300%.

Bike:
2012 Felt MP

Motors:
Huasheng 49cc 4-Stroke C.A.R.B. Approved
Crystalyte HS3540 Direct-Drive Hub

Clutch:
Fully Automatic Centrifugal EZM Q-Matic

Batteries:
AllCell - Lithium Nickel Manganese Cobalt 48V 12.9Ah (Housed in right hand ammo can)
Phantom - Lithium Ion 12V 14Ah (Housed above front fork)

Controller:
Crystalyte 40A 12 Mosfet Sensorless (2000 Watt)

Front Brake:
Tektro - Auriga E-Comp Caliper (hydraulic)
Tektro - Hard Ceramic Brake Pads
Shimano - Ice Tech Front Disk (203mm)

Rear Brake:
Crystalyte (internal electric, voltage regenerative)

Front 3 Speed Derailleur:
Shimano 105

Tires:
Geax - 24" x 2.3" Tattoo Rigid

Lights:
Rear Dual PDW - Danger Zone
Front 20 Watt CREE LED light mounted inside a Hella 500 light housing

Horn:
Wolo 139 Db 12V Air Horn

Throttles:
Electric - Left Hand Thumb Throttle
Gas - Right Hand Twist Throttle

Seat:
Harley Davidson bobber style, genuine leather, motorcycle seat

Seat Height:
28" (fixed)

Battery Range:
Batteries alone: 25 miles (no pedaling)
With gas engine running: 75+ miles (no pedaling)

Fuel Capacity:
3/4 Gallon

Weight:
100-120 pounds (estimated)

Combined Horsepower:
4.7 Horsepower (2 Gas + 2.7 Electric)

Combined Mileage:
1500 miles

Top Speed:
35-40 mph (level terrain, no pedaling)
 
Just a note- I found an alternator (car type) is very inefficient. I think 50% is likely the number. A while ago I made a gas/electric bike and it did work but later converted it to straight gas. Much better. A video of it is on youtube -
http://www.youtube.com/watch?v=k_VooEJdgoE

I saw that video a long time ago. Just looking at it made my brain ache trying to figure out how it all worked. I'm not much of a gearhead. LOL
 
Last edited:
Muffler

Wow! Great build. An inspiration. Where did you find the flexible long pipe muffler?
 
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