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)
 
I see you have it for sale. Are you planning to build another?

I can say that I was riding my bike one day and my gas throttle cable broke right in front of a house with a bunch of kids playing in the yard. They all looked at me laughing loudly and one said, "Look at him, his motorbike broke, ha ha!" I shut the gas engine off and they continued to laugh at me. I looked back at them and gave them a sad look, then I floored the e-hubs thumb throttle and rocketed away in near silence. The laughing ceased and their mouths just hung open with nothing coming out of them. That was a priceless moment. I was laughing all the way home. LMAO
 
I've got the only bike in the world that uses a shift kit and the rear wheel shifts gears automatically. I built this bike to have the versatility of shifting gears but meet the legal requirement many states have of must have automatic transmission. Other states also state the operator can't shift gears after primary drive is engaged.

What do you think about this? There's a 14 cc 4 stroke engine used for model planes. Using one of them to power a 48 volt alternator. This mini generator could come on to power a 1500 watt electric bike motor when the battery runs low as well as recharge the battery. Then cut off after the battery is charged. I know a circuit board would have to be made to turn on/off the engine. You could even make the small engine run on propane.

I think this system would work great with the autoshift shift kit system I've developed. Such a bike should be legal in most states. Would like to hear what you think about it.
 
Why don't you stop telling everyone about it and build it! It sounds great! Now shut up and build it!!!
 
I've got the only bike in the world that uses a shift kit and the rear wheel shifts gears automatically. I built this bike to have the versatility of shifting gears but meet the legal requirement many states have of must have automatic transmission. Other states also state the operator can't shift gears after primary drive is engaged.

What do you think about this? There's a 14 cc 4 stroke engine used for model planes. Using one of them to power a 48 volt alternator. This mini generator could come on to power a 1500 watt electric bike motor when the battery runs low as well as recharge the battery. Then cut off after the battery is charged. I know a circuit board would have to be made to turn on/off the engine. You could even make the small engine run on propane.

I think this system would work great with the autoshift shift kit system I've developed. Such a bike should be legal in most states. Would like to hear what you think about it.


Personally speaking, any MB with a transmission that is hidden to the common cop eye is ok by me. I could care less if it's technically not legal. I just want to be able to go uphill in traffic at a reasonable and safe speed.

The model plane engine/alternator idea is an excellent idea. My battery takes 6 hours to recharge and it quickest charge time is 3 hours using a different charger. Because of it's specific Lithium chemistry, it can't recharge any faster than that.

I can also say that in Los Angeles, where most streets are in 3rd World condition, riding hybrid MB that weighs over 100 lbs. forces me to ride at max pressure in my tires. No big deal for the front tire because of the suspension but the bike tire feels like its made of concrete when I hit any bumps and of course the whole thing then gets airborne with me on it pretty easily. Riding in Los Angeles: Not for the Faint of Heart.
 
So if three hours is the quickest charge time, the mini generator would have to power the bike for that long before it cuts off. Have you heard of any faster charge systems?
 
I've got the only bike in the world that uses a shift kit and the rear wheel shifts gears automatically. I built this bike to have the versatility of shifting gears but meet the legal requirement many states have of must have automatic transmission. Other states also state the operator can't shift gears after primary drive is engaged.

What do you think about this? There's a 14 cc 4 stroke engine used for model planes. Using one of them to power a 48 volt alternator. This mini generator could come on to power a 1500 watt electric bike motor when the battery runs low as well as recharge the battery. Then cut off after the battery is charged. I know a circuit board would have to be made to turn on/off the engine. You could even make the small engine run on propane.

I think this system would work great with the autoshift shift kit system I've developed. Such a bike should be legal in most states. Would like to hear what you think about it.


If you have built an auto shifting bike hub that makes the NuVinci N360 look silly in comparison then you should mass produce that thing. My bike started out with just a gas engine. The electric hub was added later to cope with the hills in Los Angeles. It copes quite well with any hill but it is also a crazy expensive setup for the average Joe like me. I was in shock after I added everything up when I was done building it. I'm still in shock to this day. LOL
 
I'm using a Land Rider derailleur. Much less expensive than he Nuvinci 360. Just recently did upgrades to my bike and will be posting pictures and videos soon. I now use a Staton hub and a Rino Lite double wall rim. The Staton shift kit has a 44 t for the engine. I use a Surly stainless steal 34 t chainring to drive a 8 speed DNP 34-11 freewheel. It works great been riding the bike for two years now.
 
I like to gather information from others who've made similar builds to avoid expensive mistakes before I build.

I didn't have the luxury of gathering information on a "hybrid gas/electric bike" nor did I make any expensive mistakes. I made a few cheap mistakes though but nothing huge.
 
So if three hours is the quickest charge time, the mini generator would have to power the bike for that long before it cuts off. Have you heard of any faster charge systems?

The mini generator would only have to run that long if the battery was completely drained at the time it was turned on. They key is to never let the battery reach that level. Lithium Nickel Manganese Cobalt doesn't like quick chargers for some reason. Lithium Ion may be a different story though. Lithium Nickel Manganese Cobalt is the most powerful battery (pound for pound) you can buy at the moment though. Nissan invented that Lithium chemistry for their Nissan Leaf car.
 
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