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Old 08-03-2008, 03:44 PM   #1 (permalink)
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Sprag Clutch Replacement

Here is a link from an earlier thread on failed sprag starter clutchs that shows step-by-step photos of the replacement process.

Hopefully, these photos will be useful when replacing a sprag.

Sprag replacement photos

Note: I didn't take these photos - but many thanks to the fellow T-bird owner that did.

[ This message was orginally submitted by: robsmoto on 2007-06-17 08:30 ]
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Old 11-29-2008, 09:48 AM   #2 (permalink)
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Sprag clutch engine case grinding tool home made

I just finished doing a sprag clutch on a friend's Trident. Fortunately, he had a Canadian version that had the cover above the sprag and starter idler gear. I think the tool I made would work on any of the bikes with sprag issues. I am not a Triumph mechanic and this is the first Triumph that I have ever worked on. It worked for me and just thought I would share it so there is more information out there. I had trouble getting instructions how to do it so I figured it out myself. Some people used a dremel, some used a sharp screwdriver and scraped the casing away. This cut a perfect circle (centered with the shaft bearings) and did it within a minute. I hope this helps someone out there. I realize that most engine cases have to be split but it should work on those too. Good luck!

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Old 11-29-2008, 09:06 PM   #3 (permalink)
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Welcome to the forum YT and thankyou for the excellent video.


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Old 04-16-2009, 05:17 PM   #4 (permalink)
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Is there an average milage that they go at and does it only affect some bikes or is it a case of when rather than if ?

I've 11,500 miles on my 95 Sprint, no idea if it's had the sprag clutch done or not.
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Old 04-27-2009, 04:02 PM   #5 (permalink)
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Peter.....

Mine went somewhere between 16/20K - gave me lots of warning. Started with the occasional CLACK and then gradually went to a complete inability to engage over a period of about 4 months. Factors include state of tune (hard-starters will incur the problem more quickly due to lots of cranking), starting in neutral or in gear, riding pattern and pure luck.
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Old 04-28-2009, 04:48 PM   #6 (permalink)
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Quote:
Originally Posted by cafetbird View Post
Note: I didn't take these photos - but many thanks to the fellow T-bird owner that did.
It was TriumphRat member SWare
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Old 04-28-2009, 10:08 PM   #7 (permalink)
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Mine has gone caboom at less than 31,00 on the speedo.
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Old 05-01-2009, 10:38 PM   #8 (permalink)
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Hey guys I think I'm in the same boat with my 95 sprint. Dealer said it would cost 14 hours worth of labor if the engine has to be pulled apart. Im gonna check tonight and see if there is the door on top of the crankcase for access. AHH that just irks me. At 100 bucks an hour, thats a down payment on a brand new daytona ...
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Old 01-01-2010, 09:51 AM   #9 (permalink)
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sprag clutch replacement

I'm new to this. I hope this ends up in the right place. I did the sprag on my '99 S3 at 26k. Engine out, split the cases. I'm not a mechanic. I did it with a Haynes manual. The old sprag seemed fine when I took it out. But you can't apply the same forces to it with your hands that it is subjected to in the engine. It was a big job, but very satisfying in the end. About 4000 miles later it still starts every morning. Just last week I noticed some coolant coming from the head gasket. Has anyone done a head gasket? The manual says it can be done in the frame. Another big job though, it seems to me. Happy New Year!!
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