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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: jessez on April 10, 2016, 10:42:04 PM

Title: sprag clutch issues
Post by: jessez on April 10, 2016, 10:42:04 PM

Just thought I'd generate some hope to people who are in a similar situation:
I lost my last bike (92 K75s) to a ruined sprag clutch.  I heard it grinding on ignition for a few weeks until I figured out what it was, then it was too late.  My local BMW guys explained that a repair for this would cost nearly the worth of the bike.  I sold it, and then got a 95 K110rs.  After a few months, I had another (what I think) sprag clutch problem.  This time it didn't grind, just intermittently would not make contact (just a whirring noise with no engagement).  I began to justifiably freak out, but reread the threads on sprag clutch issues.  Long story short, I changed the oil and added seafoam to the crankcase as soon as possible, and I've been issue free for a few months.  Literally, the problem went away.  Just passing it on so that others out there don't go through the same nightmare I did.

Title: Re: sprag clutch issues
Post by: Laitch on April 10, 2016, 11:04:29 PM

 :clap:
Thanks for posting this!

Title: Re: sprag clutch issues
Post by: The Mighty Gryphon on April 10, 2016, 11:49:17 PM

Really glad to hear it worked for you.  :2thumbup:

Title: Re: sprag clutch issues
Post by: Chaos on April 11, 2016, 12:17:31 AM

Another thread here had success carefully drilling a hole through the case to lube the sprag directly. 

Title: Re: sprag clutch issues
Post by: Conrad325i on April 24, 2016, 11:43:56 PM

I drilled the hole and tapped it for an npt allen plug then changed oil and put seafoam. To start the bike the first two or three times i had to tap on the sprag housing thru my hole and spray WD40 in the lube hole. After this and seafoam it became reliable.

Title: Re: sprag clutch issues
Post by: jjs1234 on April 27, 2016, 02:56:49 AM

This is it, right? On the left

(http://uploads.tapatalk-cdn.com/20160427/bfc6b7acfc6d77f01e8933a57c0ca149.jpg)

Sent from my HUAWEI MT7-L09 using Tapatalk

Title: Re: sprag clutch issues
Post by: rbm on April 27, 2016, 06:39:55 AM

Correct, jjs.  The object at the far left in that picture is the sprag clutch.  The other objects in the picture are alternator drive dog and starter motor idler gear.