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Post Info TOPIC: New Sprag Clutch Assembly on Ebay


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New Sprag Clutch Assembly on Ebay
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There is a Taiwanese manufacturing company selling our one way starter clutch assemblies on Ebay.  The company is Frontier Motor.

The price is incredible and they ship worldwide.  I ordered one and it appears to be OEM quality.  Does anyone have any knowledge about this company? 

https://www.ebay.com/itm/Ony-Way-Bearing-Starter-Clutch-Gear-for-Yamaha-TTR-250-TTR250-Engine-Parts-99-06/124146077319

 

 



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-Jeff



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Not sure about the company but  Rich on here put an aftermarket one in and it disintegrated causing a lot of damage, let's hope yours doesn't do the same.

It would be great if it last as they are expensive from Yamaha.

Let us know how you get on.



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Read all about it here 

https://ttr250.activeboard.com/t64076126/after-market-chinese-sprag-clutch/



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There are 2 types of sprags I've seen.  The cheap one that blew apart is a different design than the OEM design.  The Frontier sprag is identical to our OEM design.



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-Jeff



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Jeff

I mean this in a nice way, you are our test Guinea pig

Full report when fitted and some miles on will be appreciate by all.

 



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No problem Steve. smile

I am going to install it on a spare motor I am refurbishing.  Then I'll test it.  May be awhile, but I'll post reports as I make progress.



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-Jeff



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How is the sprag Clutch  holding out many miles and or starts on it

 

Thanks Grahame



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Hi Grahame.

I installed this sprag on my recent street rebuild and it only has about about 100 starts on it along with about 200 miles.  Fitment was spot on and snug.  Some cheap sprags are too tight and will not slip like they are supposed to while the engine is running causing premature wear and failure of sprag and starter gears.  Sofar, it has performed exactly the same as my stock Yamaha sprags.  I'll keep the site posted of any failure. 



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-Jeff



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Thanks Jeff

 

be interesting to hear from other  members that have fitted replacement Sprag Clutch,  I note that the after market one you fittedd was near exact as the Yamaha factory?

 

thanks grahame



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Yes.  You can't identify the difference between the Yamaha and the Frontier (Taiwan) sprag in both appearance, materials, or performance.  The Frontier sprag comes with the gear race that it slides on which is a good thing because the old gear race usually gets damaged and worn by the old sprag. 



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-Jeff



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Update

I had to tear down the engine after 1000km due to a crank bearing case sleeve failure.  This gave me an opportunity to check on the sprag and gear wear.

Crank bearing case failure_20210823_7.jpgCrank bearing case failure_20210823_8.jpgCrank bearing case failure_20210823_9.jpg

 

I'm very pleased with its performance.  I'll be putting it back in service.

I agree that most of the cheap Chinese sprags are junk.  But this Taiwanese sprag from Frontier Motors was a little over half of the cost of the Yamaha sprag and gear assembly. 

 



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Good news, Jeff. Thanks.

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Grandpa Tom

 



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Thanks for the feedback Jeff - most appreciated biggrin



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