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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

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  #1  
Old 01-02-2017, 03:19 PM
dan@adelsigns.com dan@adelsigns.com is offline
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Join Date: Oct 2013
Location: NH
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Thumbs up help with finding a clutch

Hi everyone. Back a while ago, Msrfan mentioned using a clutch with a one way bearing, in order to be able to pedal the bike and start the 4 stroke engine. Any ideas? The Comet type clutches seem to freewheel either way so don't think that those are it. He hasn't posted since 2010 so assuming he isn't responding anymore.
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  #2  
Old 01-02-2017, 03:57 PM
TheNecromancer13 TheNecromancer13 is offline
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Location: Portland, Oregon
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Default Re: help with finding a clutch

Not sure where you could get a one way clutch like that, but Msrfan is still active so he might know.
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  #3  
Old 01-02-2017, 07:48 PM
Seabass Seabass is offline
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Default Re: help with finding a clutch

He replied to a PM for me a month or two ago
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  #4  
Old 01-02-2017, 07:53 PM
MEASURE TWICE MEASURE TWICE is offline
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Location: CA
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Default Re: help with finding a clutch

Tony01 had a thread on his bike that has I think it was 3 clutches that make up a two speed automatic tranny. I think it was there that some bearing or something in conjunction with the auto clutches made the thing work. The Bearing or something was the part that was special and would only engage when spun faster in one direction than the relative rotation.

Check it out, maybe if that is right then that might help. Otherwise some other way many have pedal start. I ended up just using the recoil starter on my Briggs.

Just found it. Called a One Way Bearing.

http://motorbicycling.com/showthread.php?t=59169

http://motorbicycling.com/showthread.php?t=46564

sprag bearings are the item

https://search.yahoo.com/yhs/search?...&hsimp=yhs-005

http://www.ebay.com/itm/CSK20PP-20mm...3D152027498946

Last edited by MEASURE TWICE; 01-02-2017 at 08:20 PM. Reason: Both Tony01 and Msrfan links
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Old 01-02-2017, 08:22 PM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: help with finding a clutch

All my searching finds these only in metric sizes. I did see where a key way is available on both inner and outer bearing surface though.

I did not see 5/8 or 3/4 shaft sizes, the inner bearing surface diameter.

MT
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  #6  
Old 01-03-2017, 08:36 PM
3dmotorsportLLC's Avatar
3dmotorsportLLC 3dmotorsportLLC is offline
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Default Re: help with finding a clutch

https://www.youtube.com/watch?v=fVaQP98ChDo

Here's Pat (owner of Sportsman Flyer) pedal starting one of his bikes with a 3D manual clutch.
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Old 01-03-2017, 11:20 PM
dogcatcher dogcatcher is offline
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Default Re: help with finding a clutch

Quote:
Originally Posted by 3dmotorsportLLC View Post
https://www.youtube.com/watch?v=fVaQP98ChDo

Here's Pat (owner of Sportsman Flyer) pedal starting one of his bikes with a 3D manual clutch.
That is a good demo of the 3D clutch.
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