Reversing a Flywheel?

[mhan]

I have a mini bike wheel with a sprocket mounted to a flywheel and i need to reverse the flywheel so it will engage itself spinning the other way. Do i need a new flywheel or just need to flip it over, and if so...how?

 

[Russ2251]

I have a mini bike wheel with a sprocket mounted to a flywheel and i need to reverse the flywheel so it will engage itself spinning the other way. Do i need a new flywheel or just need to flip it over, and if so...how?

Uh... well...You have pics? Would help a lot..

 

[mhan]

I'll get some on by this time tomorrow.

 

[Russ2251]

I'll get some on by this time tomorrow.

I sense the minibike gods are smiling on humble self...

 

[mhan]

Pictures

(NOTE: Rear wheel not mounted yet, no axle. Motor not mounted yet)

See Picture 4 for Problem Concerning Flywheel

1. Picture of Rear Wheel Assembly


2. Picture of Rear Wheel With Sprocket


3. Above View of Rear Wheel Assembly


4.Rear Wheel With Bolt On Sprocket Removed


Does anyone know of an easy way to reverse the spin of the flywheel. Maybe just flipping it over?

 

[ed1380]

make the engine spin backwards?
good luck doing that

 

[Russ2251]

I think you are using incorrect terminology. No problem.
Flywheel is located under (behind) black recoil/blower housing and is not exposed in your pics.
Chain simply runs between sprockets and you should be good to go. See attached.
Hope this helps. Let us know.

 

[Russ2251]

make the engine spin backwards?
good luck doing that

It's a challenge but I've done it. If it was 4 cycle I wouldn't even attempt it but is also possible.

 

[mhan]

i think you guys are misunderstanding me. The flywheel on the wheel is rotating opposite of what i need it. The flywheel disengages the sprocket when going backwards so not to fight the compression of the motor. I need it to do this instead of disengaging when going forwards. The wheel was meant for a motor with the toothed clutch on the other side. Maybe it's a little clearer now

 

[kibble]

Oh, I think you're trying to say that the motor is mounted in the opposite way it would be normally, thus spinning in the opposite direction?

 

[Russ2251]

The flywheel on the wheel is rotating opposite of what i need it.

Sorry, there's something I'm just not getting. What do you mean by flywheel? Flywheels are not associated with rear wheel at all.
As you face left side of bike (nice design by the way) transmission sprocket rotates counter clockwise as does drive wheel once your chain is installed. Wheel can only be powered in same direction as engine.
Your design, as pictured, should work well.

 

[Russ2251]

Oh, I think you're trying to say that the motor is mounted in the opposite way it would be normally, thus spinning in the opposite direction?

Mr. Kibble:
I thought of that. Look closely at engine pic. Check starter handle. It is at bottom of housing which is correct for standard left hand or counterclockwise direction (at pto).
This one has me stumped.

 

[kibble]

The flywheel on the wheel is rotating opposite of what i need it. The flywheel disengages the sprocket when going backwards so not to fight the compression of the motor. I need it to do this instead of disengaging when going forwards. The wheel was meant for a motor with the toothed clutch on the other side. Maybe it's a little clearer now

Wait wait wait! I think you mean that the "sprocket on the wheel" has a one was bearing or something similar that will not make the wheel turn if it's the position you currently have it! Is that right? Kind of like on a bike, when you pedal, you engage the sprocket and it rotates the wheel.

 

[Russ2251]

Wait wait wait! I think you mean that the "sprocket on the wheel" has a one was bearing or something similar that will not make the wheel turn if it's the position you currently have it! Is that right? Kind of like on a bike, when you pedal, you engage the sprocket and it rotates the wheel.

Do you mean like a bicycle coaster brake?

 

[kibble]

Yes! Except not to stop the wheel, just to make it rotate. That's what it's sounding like to me.

 

[jr dragster T]

Yes I was JUST about to say that. What he wants is so he can coast without turning over the drive train but what he wants is to reverse the rotation of when the pauls in the sprocket "lock" up.

 

[Russ2251]

I've never heard of a setup like this. What is the purpose?
This engine is equipped with centrifugal clutch which in itself provides the ability to coast.

 

[Russ2251]

Mr. Mhan:
It appears you have a wheel that has a built in coaster. Meaning that bearing locks in one direction and freewheels in opposite direction. Is this correct?
If so, it was probably designed to run with a jack shaft. A jack shaft transfers power to other side of frame which would correct your assumed problem.
Adding a jack shaft will make things more complex. Supports and bearings will have to be added which translates into more dollars, work, time, effort, and unnecessary weight.
Try to avoid this if possible. Try to get a wheel/sprocket assembly that does not freewheel or figure out a way to lockup the existing wheel/sprocket assembly.
To flip over engine and then reverse it's direction of rotation would not be cost effective. Would likely cost many times what you paid for engine to begin with.

 

[crazycart]

I believe they are called a "freewheel" maybe he meant that instead of flywheel.

 

[kibble]

I believe they are called a "freewheel" maybe he meant that instead of flywheel.

I believe you hit the jackpot! I could not think of the technical name.