Free wheel front sprocket for motorcycle?
 

Does there exist a free wheel front sprocket for motorcycle?

15 tooth for an NBC110 Honda Super Cub to eliminate engine breaking would be good.

I figure such a sprocket would be an easy install.

I've read about the sprag clutch discussions previously on this forum.

Something like this:
https://ecomodder.com/forum/attachme...1&d=1561376192

https://www.ebay.com.au/itm/Veteran-...frcectupt=true

You can buy freewheel bearings, but I don't think they'd handle the torque at the wheel nor at the engine sprocket. Maybe the largest would. (Yes, not very helpful)

Clutch is how you freewheel.

Yes...but it would be awesome to be able to freewheel the chain too. Except that would require a freewheeling rear sprocket.

Some motorized bicycle kits come with a freewheeling front sprocket, general consensus is that they are trash, even those 2 hp engines destroy those sprockets. You have to weld them together.

In that case I'd have to install a clutch on an NBC110 which has a centrifugal clutch.

Break through!
 

Break through!

The gear lever doubles as a clutch lever, when you hold up or push down the gear lever it engages a clutch in order to change gear and as long as you hold the gear up or down it will free wheel!

I just realized this today on the bike.

I would still like to eliminate engine breaking automatically.

I found that out at one point with a Yamaha TTR 90, you can also use it to launch. :)

I gave this some thought while building my C90, took my inspiration from Matt Guzzetta's Suzuki streamliner, he used a starter motor clutch in the rear wheel, far beyond my engineering capabilities.

I never considered a freewheel front sprocket, a much easier project I think.
He did say that the brakes had to be used 'with some authority' because of the lack of engine braking.

A great idea, but I don't think a 'burn and coast' would work so well on such a lightweight motorcycle, it might be useful in a mountainous region.
Using a bigger front sprocket and smaller rear would help. You can certainly go to 16/36 without any issues, pitbike front sprockets will fit and are very cheap so you can experiment.

Pete.

A freewheel rear sprocket is definitely the most effective way to reduce drag. Takes the chain out of the equation too. I think I might try the starter clutch idea for my CBR

How much hp and torque does an a/c clutch hold up to? Maybe you could go electro-magnetic clutch on the rear wheel to retain engine braking?