Free wheel front sprocket for motorcycle?

[Spaghetti Man]

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

[Stubby79]

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)

[redpoint5]

Clutch is how you freewheel.

[Daschicken]

Originally Posted by redpoint5

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.

[Spaghetti Man]

Originally Posted by redpoint5

Clutch is how you freewheel.

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

[Spaghetti Man]

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.

[Daschicken]

Originally Posted by Spaghetti Man

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

[Ironside]

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.

[bschloop]

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

[M_a_t_t]

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?