I'm going to build a motorized mobility scooter.
I'd like to be able to drag-start the engine using the scooters electric motor as the propulsion source.
The scooter motor spins at approximately 4000rpm and has a shaft protruding from the motor that can be hooked to a sprocket for linking to the gas motor.
I could take one of the clutch 2-stroke kits and make this work pretty easily. I'm not sure what sprocket ratio I'd need, but it wouldn't require much of a ratio; maybe 1:2 or so...at what RPM do these 2 stroke motors run? Can someone tell me?
Does anyone make a bump-startable 4-stroke kit? What if I were to defeat the centrifugal clutch and freewheel on the 4-stroke kit, couldn't I drag-start it then, and simply use the disengager to disengage the engine and shut it down? The mobility scooter has a 1.5hp motor. You'd stop, engage the disengager, start scooting on electric power, drag-start the motor, then back off the electric power and throttle-up. I just don't know if it would work to drag-start the 4-stroke kits like the Dax 50cc kit through the gearbox like that.
Suggestions?
As discussed in my "hello world" thread, I've built gas powered battery chargers for the scooter in the past. They are very inefficient, bulky, and heavy, but still useful when we go camping. I will be able to use the DC motor on the scooter as a generator with this approach (if I want to), and will also be able to use the gasoline power more efficiently as direct propulsion, and expect better economy, less weight, and a smaller package.
I'd like to be able to drag-start the engine using the scooters electric motor as the propulsion source.
The scooter motor spins at approximately 4000rpm and has a shaft protruding from the motor that can be hooked to a sprocket for linking to the gas motor.
I could take one of the clutch 2-stroke kits and make this work pretty easily. I'm not sure what sprocket ratio I'd need, but it wouldn't require much of a ratio; maybe 1:2 or so...at what RPM do these 2 stroke motors run? Can someone tell me?
Does anyone make a bump-startable 4-stroke kit? What if I were to defeat the centrifugal clutch and freewheel on the 4-stroke kit, couldn't I drag-start it then, and simply use the disengager to disengage the engine and shut it down? The mobility scooter has a 1.5hp motor. You'd stop, engage the disengager, start scooting on electric power, drag-start the motor, then back off the electric power and throttle-up. I just don't know if it would work to drag-start the 4-stroke kits like the Dax 50cc kit through the gearbox like that.
Suggestions?
As discussed in my "hello world" thread, I've built gas powered battery chargers for the scooter in the past. They are very inefficient, bulky, and heavy, but still useful when we go camping. I will be able to use the DC motor on the scooter as a generator with this approach (if I want to), and will also be able to use the gasoline power more efficiently as direct propulsion, and expect better economy, less weight, and a smaller package.