Need help understanding a tapered shaft adapter

Denny B · 07-24-2022, 05:26 PM

I am building a "buggy" to use around the neighborhood. I have a Yamaha G14 frame but no body.

I installed a Predator 212 (6.5 HP). I installed a CVT torque converter and it runs okay. I want to try the "Primary clutch/secondary clutch" set-up.

The engine has a 3/4" straight shaft. The primary clutch has a 1.18" tapered bore.

I ordered this adapter: https://www.amazon.com/dp/B085D8FGNB...roduct_details

Here is my question. The adapter did not come with a "key". The tapered bore in the clutch does not have a "key slot". Shouldn't there be a key on the straight engine shaft? Does pressure/torque hold the clutch on the tapered shaft?

The "key slot" in the engine shaft is 3/16". If the adapter takes a key it would need to be much smaller.

Thanks for any help.

meimk · 07-24-2022, 06:17 PM

The taper is intended to hold by friction, no key required The trick is that the tapered adapter has to stay at the very end of the non-tapered shaft, usually by way of a spacer.

Denny B · 07-24-2022, 07:30 PM

Quote:

Originally Posted by meimk

The taper is intended to hold by friction, no key required The trick is that the tapered adapter has to stay at the very end of the non-tapered shaft, usually by way of a spacer.

It came with a spacer. But I don't understand how it won't slip around the straight engine shaft.

So...I should install the spacer, install the tapered adapter, slide the clutch on and tighten down the bolt? No key needed?

meimk · 07-24-2022, 08:58 PM

Correct. Tapered drive clutches don't use a keyway.

slonomo · 07-24-2022, 09:03 PM

What did the directions say? Or was it one of those China kits with no paperwork?

Post some pics of the parts you're dealing with, might help.

Denny B · 07-24-2022, 10:56 PM

Quote:

Originally Posted by meimk

Correct. Tapered drive clutches don't use a keyway.

Thank you for your help.

Denny B · 07-24-2022, 10:58 PM

Quote:

Originally Posted by slonomo

What did the directions say? Or was it one of those China kits with no paperwork?

Post some pics of the parts you're dealing with, might help.

This is the adapter I purchased:

https://www.amazon.com/dp/B085D8FGNB...roduct_details

It came with no instructions.

slonomo · 07-25-2022, 06:13 AM

Actual photos of your parts might help. But it looks as if they are providing a slot for your key on the crankshaft to fit into.

Cartmaster · 07-25-2022, 06:21 AM

But i dont think the clutch is slotted anyway. Maybe i am wrong but i would assume the clutch taper would clamp the adapter nice and tight.

Edit! Now i see what you mean Slonomo, the key might hold the adapter and the taper would snug the clutch.

raydhd · 07-25-2022, 09:25 AM

BUT would a key keep the adapter from tightening up evenly around the taper ?

07-24-2022, 05:26 PM	#1
Denny B Not Yet Wild Join Date: May 2022 Location: Ocala, FL Posts: 35	Need help understanding a tapered shaft adapter I am building a "buggy" to use around the neighborhood. I have a Yamaha G14 frame but no body. I installed a Predator 212 (6.5 HP). I installed a CVT torque converter and it runs okay. I want to try the "Primary clutch/secondary clutch" set-up. The engine has a 3/4" straight shaft. The primary clutch has a 1.18" tapered bore. I ordered this adapter: https://www.amazon.com/dp/B085D8FGNB...roduct_details Here is my question. The adapter did not come with a "key". The tapered bore in the clutch does not have a "key slot". Shouldn't there be a key on the straight engine shaft? Does pressure/torque hold the clutch on the tapered shaft? The "key slot" in the engine shaft is 3/16". If the adapter takes a key it would need to be much smaller. Thanks for any help.

07-24-2022, 06:17 PM	#2
meimk Gone Wild Join Date: Jun 2011 Location: Northern Indiana Posts: 2,823	Re: Need help understanding a tapered shaft adapter The taper is intended to hold by friction, no key required The trick is that the tapered adapter has to stay at the very end of the non-tapered shaft, usually by way of a spacer.

07-24-2022, 08:58 PM	#4
meimk Gone Wild Join Date: Jun 2011 Location: Northern Indiana Posts: 2,823	Re: Need help understanding a tapered shaft adapter Correct. Tapered drive clutches don't use a keyway.

07-24-2022, 09:03 PM	#5
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: Need help understanding a tapered shaft adapter What did the directions say? Or was it one of those China kits with no paperwork? Post some pics of the parts you're dealing with, might help.

07-25-2022, 06:13 AM	#8
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: Need help understanding a tapered shaft adapter Actual photos of your parts might help. But it looks as if they are providing a slot for your key on the crankshaft to fit into.

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07-25-2022, 06:21 AM	#9
Cartmaster British born Nincompoop Join Date: Feb 2007 Location: United Kingdom Posts: 2,461	Re: Need help understanding a tapered shaft adapter But i dont think the clutch is slotted anyway. Maybe i am wrong but i would assume the clutch taper would clamp the adapter nice and tight. Edit! Now i see what you mean Slonomo, the key might hold the adapter and the taper would snug the clutch.

07-25-2022, 09:25 AM	#10
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,633	Re: Need help understanding a tapered shaft adapter BUT would a key keep the adapter from tightening up evenly around the taper ?

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