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Old 06-24-2019, 07:26 AM   #1 (permalink)
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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://www.ebay.com.au/itm/Veteran-...frcectupt=true


Last edited by Spaghetti Man; 06-24-2019 at 07:37 AM..
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Old 06-24-2019, 10:24 AM   #2 (permalink)
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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)
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Old 06-24-2019, 11:36 AM   #3 (permalink)
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Clutch is how you freewheel.
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Old 06-24-2019, 12:25 PM   #4 (permalink)
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Quote:
Originally Posted by redpoint5 View Post
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.
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Old 06-24-2019, 07:30 PM   #5 (permalink)
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Quote:
Originally Posted by redpoint5 View Post
Clutch is how you freewheel.
In that case I'd have to install a clutch on an NBC110 which has a centrifugal clutch.
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Old 06-25-2019, 08:51 PM   #6 (permalink)
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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.
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Old 06-28-2019, 02:18 PM   #7 (permalink)
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Quote:
Originally Posted by Spaghetti Man View Post
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.
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Old 07-01-2019, 02:52 PM   #8 (permalink)
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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.
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Old 07-22-2019, 10:30 AM   #9 (permalink)
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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
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Old 07-22-2019, 03:38 PM   #10 (permalink)
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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?

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