Official 3D Motorsport Manual Clutch Thread

3dmotorsportLLC · Jun 21, 2016

Hi all!

My name is Danny and I'm the owner of 3D Motorsport and Engineering, LLC. You may have seen our advertisement in the right or left vertical banners of this forum.

We make manually actuated cable clutches primarily for mini bikes that use 3/4" shaft utility engines (Predator 212, Briggs and Stratton, Tecumeseh, Honda, etc.)

We are seeing that a lot of folks are running these same engines in their motorized bicycles and have sold quite a few clutches to guys running them on motorized bikes with success.

The clutch is particularly awesome for motorized bicycles since it allows the rider to pedal start the engine which is something you can't typically do with a centrifugal clutch.

We would love to answer any questions you might have about the 3D Manual Clutch.

For more information check out our website: http://www.3DMotorsport.net

zean · Jun 22, 2016

Hello Danny. Looks good (quality and price both). Thank you.
Does your clutch work good on a stock engine, or do the benefits
manifest themselves much better with an engine with after-market parts?
Thanks again.

3dmotorsportLLC · Jun 22, 2016

Thanks for the compliments on the product.

The clutch works excellent on stock engines. We have customers running them on everything from 4 horsepower Briggs and Strattons, to 23+ horsepower Predator 212's.

We even have a few customers that mounted them on jackshafts and are running them with 79cc predators in bicycles.

azbill · Jun 22, 2016

Hi Danny
I have been following this clutch since you first started talking about it on facebook

I currently have a 99cc predator/Q-Matic equipped stretch cruiser that I use for pulling custom trailer to transport my granddaughters (400+ lbs total)

I am currently using a 72tooth rear sprocket and am thinking of upgrading to a lifan 160f engine (118cc)and your clutch
what I would like to know is, what ratio would you recommend for pulling a heavy load ???

3dmotorsportLLC · Jun 22, 2016

Hi Bill,

Correct me if Im wrong, but doesnt the lifan 160 have a built in clutch and transmission?

Somewhat related to your question, we just got done adapting a 3D clutch to a customers Q-matic transmission. Check it out here: http://http://3dmotorsport.net/blogs/news/118037124-3d-manual-clutch-on-an-ez-motorbike-q-matic-transmission

azbill · Jun 23, 2016

this is the engine I am talking about

http://www.ebay.com/itm/221893579427?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

I did see your video already, I cannot do it the same way due to the inner bearing carrier already up against the seat tube

3dmotorsportLLC · Jun 23, 2016

azbill said:
this is the engine I am talking about
http://www.ebay.com/itm/221893579427?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

I did see your video already, I cannot do it the same way due to the inner bearing carrier already up against the seat tube

The 3D clutch would bolt right up that 4 horsepower motor you posted and would work very well.

zean · Jun 24, 2016

Excuse me Danny. Is it possible to bolt a jack-shaft assembly and your clutch
guard to the side of a honda 160gx, then install your clutch (as inst.) to the shaft?
And, if your clutch is 3.125 inches wide and most crank shafts are 2.3 inches in length from the side of the engine, how is there enough room on the shaft to bolt the clutch?
Thank you Danny for your time. I appreciate it. I'm probably missing something. Thanks again.

3dmotorsportLLC · Jun 24, 2016

zean said:
Excuse me Danny. Is it possible to bolt a jack-shaft assembly and your clutch
guard to the side of a honda 160gx, then install your clutch (as inst.) to the shaft?
And, if your clutch is 3.125 inches wide and most crank shafts are 2.3 inches in length from the side of the engine, how is there enough room on the shaft to bolt the clutch?
Thank you Danny for your time. I appreciate it. I'm probably missing something. Thanks again.

You are correct that the clutch is longer than most PTO shafts, but that is not an issue and does not impact the operation of the clutch in any way. There is a bolt at the end of the clutch that screws into the PTO shaft to hold it on.

As far as using an engine mounted jackshaft, i believe that it is possible with some modification to the clutch guard.

Velodrome · Jun 30, 2016

Heck Bill. Just go 212cc and have done with it!

3dmotorsportLLC · Jul 25, 2016

This might not be a motorized bicycle, but we're pretty proud of the amount of abuse that this clutch can take. The customer in the video below is using the clutch on an 80 horsepower 500cc twin with a ton of success. Check it out:

https://m.youtube.com/watch?v=wSCpnNi-yuA

3dmotorsportLLC · Jul 25, 2016

Check out these awesome pictures of a customer's bike. We modified his Q-Matic transmission to accomodate the 3D clutch. He is loving it and finally has the ability to pedal start his bike. He also stated that it cruises way better than before, especially at speeds that would have otherwise been in the partially engaged range of the centrifugal clutch that was there before.

16v4nrbrgr · Jul 26, 2016

Is there a way to put a 415h sprocket on the clutch? The clutch would be nice on my chopper but I'd like to keep the existing rear sprocket which uses 415h. I'm thinking about going from a ktm50 to a 212 to make it the bike more useable.

3dmotorsportLLC · Jul 26, 2016

16v4nrbrgr said:
Is there a way to put a 415h sprocket on the clutch? The clutch would be nice on my chopper but I'd like to keep the existing rear sprocket which uses 415h. I'm thinking about going from a ktm50 to a 212 to make it the bike more useable.

I'm not familiar with 415H chain, but if it's 1/2" pitch chain, then I am sure we could narrow up one of our 428 sprockets to be compatible with 415H.

We narrowed the 428 sprocket to fit #41 chain on the sportsman flyer that was posted previously.

16v4nrbrgr · Jul 27, 2016

That would work, it's 1/2 pitch. I'll keep it in mind if I find time to do the engine swap. Thanks for the info!

FFV8 · Jul 27, 2016

3dmotorsportLLC said:
This might not be a motorized bicycle, but we're pretty proud of the amount of abuse that this clutch can take. The customer in the video below is using the clutch on an 80 horsepower 500cc twin with a ton of success. Check it out:

https://m.youtube.com/watch?v=wSCpnNi-yuA

So does this mean you are making this clutch with the 30mm 1:10 taper bore?

some pics of the install in that kart would be good.

3dmotorsportLLC · Jul 27, 2016

FFV8 said:
So does this mean you are making this clutch with the 30mm 1:10 taper bore?

some pics of the install in that kart would be good.

We only make the clutch for 3/4" shaft size at the moment. This particular customer built a jackshaft to hold the clutch and ran a belt from the shaft of the engine to the jackshaft.

Check out the pictures at this link: http://3dmotorsport.net/blogs/news/3d-clutch-on-an-80-horsepower-sled-engine

FFV8 · Jul 28, 2016

Thanks for the info.

The 1" unit looks promising. 75 ft/lbs would be just enough. Right now I hit more than 50 ft/lbs @ 2800 rpm.

3dmotorsportLLC · Jul 28, 2016

FFV8 said:
Thanks for the info.

The 1" unit looks promising. 75 ft/lbs would be just enough. Right now I hit more than 50 ft/lbs @ 2800 rpm.

What motor?

FFV8 · Jul 28, 2016

This engine:

http://ffv8.com/vintage-4-stroke.html

Lots of torque with the 4.75 stroke crank in it. New cylinders are in the works with a 3.188 bore too...

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