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Post Info TOPIC: Another jammed sprag clutch!


Super Guru

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Another jammed sprag clutch!
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I am stripping an engine and the sprag clutch was really jammed.

If you look at the way the bearing assembly has been bent, this sprag kicked back big time!  Can't believe it wasn't giving out audible warning signals to the owner well before this happened. confuse

Jammed sprag 1.jpg

 

I have found the best way to safely unjam the sprag is to pad the vice jaws to hold Gear3, put a couple of bolts in the sprag and turn it anti-clockwise with a bar.

Jammed sprag 2.jpg

 

The old sprag ready for the bin!

Jammed sprag 3.jpg



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Newbie

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it's a shame this bike has this problem, a marvel to ride and a chronic problem that can cause huge problems...
I'm using "dr" google!🙄🤣

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Super Guru

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It's quite common on bikes that owners try to start repeatedly with flat batteries. The kickback when there's not enough juice to get past the compression stroke causes the problem. I've also seen it on Yamaha and Honda farm quads that are left long periods and abused!
I also think poor servicing can be a factor with metal particles in old oil damaging the surfaces.

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Veteran Member

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I recently posted the replacement of my sons Sprag,

I live in Australia and the cost to purchase genuine Yamaha "STARTER ONE-WAY ASSY Part #: 4GY-15590-00" was over $312 AUD, I didn't want to go for aftermarket although temping for half the cost. I went to Partzilla in the USA and purchased Genuine for $112USD plus $40 USD postage total $152 USD converting to AUD was $215

Hopefully Part in the UK don't have the added mark up. Otherwise this purchase option may save you some money

Grahame

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When the dragon clutch foes that.  Do you just change the bearing part or do you change the bit with the gear on it as well ? 



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Super Guru

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Joss wrote:

When the dragon clutch foes that.  Do you just change the bearing part or do you change the bit with the gear on it as well ? 


 It depends on whether the boss on Gear 3 is worn or damaged. The sprag is expensive so, if in doubt, err on the side of caution and replace both wink

Brian



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Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ! 
 

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Thank You Brian . One day i will get my ttr250 on the road . Till then ill be asking questions biggrin



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