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March 17th, 2010, 02:26 PM   #1
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sprague springs made

Just to let you know that I have had some sprague springs produced that are of superior quality to the ones fitted OEM. as previously said on UHE, the springs are inferior from the factory and don't expand between each part while over stretching in the gaps.

the ones i've had made are weird feeling things and only make sense when opened out and fitted. uueerr missus! anyway, after initial tests by owners the starters are getting the thumbs up. I'll be selling them along with enough shims (2) and instructions for anyone to do the job of the sprague and the starter clutch at home.

expect 15 to be the total.

regards

Taffy
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March 21st, 2010, 10:52 AM   #2
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Re: sprague springs made

i'm bumping this for those that may care to comment.

regards

Taffy
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March 22nd, 2010, 10:50 AM   #3
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Re: sprague springs made

what are the shims for? how about a pic?
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March 22nd, 2010, 01:18 PM   #4
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Re: sprague springs made

Originally Posted by ned37
what are the shims for?
I'm gonna guess the shims are for the torque limiter gear, so it won't break free so easily.

I think it's fantastic that you're offering this Taffy!
I cut 20mm from my stock spring and it's been working real well. It will however, slip if the outdoor temps are freezing the first couple of tries. I'll keep your kit in mind for the next time I have my side case off to repair weep hole leakage.

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March 22nd, 2010, 02:04 PM   #5
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Re: sprague springs made

Originally Posted by logjump
Originally Posted by ned37
what are the shims for?
I'm gonna guess the shims are for the torque limiter gear, so it won't break free so easily.

I think it's fantastic that you're offering this Taffy!
I cut 20mm from my stock spring and it's been working real well. It will however, slip if the outdoor temps are freezing the first couple of tries. I'll keep your kit in mind for the next time I have my side case off to repair weep hole leakage.

log
yeh spot on log! I find that getting the two done cures it all in one visit. another USP for me.

regards

Taffy
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March 22nd, 2010, 06:15 PM   #6
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Re: sprague springs made

I'll put my ignorance on public display. I understand the principles of shimming the torque gear limiter, but where does the spring go?

I thought the gear limiter was what caused the starter to spin. Either way, I think I need the kit if someone can tell me where to install the spring
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March 22nd, 2010, 06:42 PM   #7
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Re: sprague springs made

he's solving problems with both by replacing the spring that holds the inner freewheel of the sprague together
as well as shimming the torque limiter.
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March 22nd, 2010, 06:55 PM   #8
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Re: sprague springs made

Originally Posted by ned37
he's solving problems with both by replacing the spring that holds the inner freewheel of the sprague together
as well as shimming the torque limiter.
Gotcha. Thanks Ned.

I looked at the factory repair manual under the section about servicing the freewheel and still don't see a spring.
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March 22nd, 2010, 07:34 PM   #9
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Re: sprague springs made

Johnf3 (and others),
Here's a website that goes into a fair amount of detail involving the sprague. It's from a Ducati but basically the same as found in the Husaberg and other MC's. You'll see the small spring that Taffy has upgraded. I cut 20mm off the factory spring and had much improved GRAB. Rather than deal with doing that modification, I think it's fantastic that Taffy has gone to the trouble to put a kit together to deal with the sprague along with the torque limiter.

We all love trouble free E-Starting!

Here's that website;
http://www.mad-ducati.com/Technical/...ragClutch.html




.
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March 23rd, 2010, 03:15 AM   #10
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Re: sprague springs made

yep, the shims go in the torque limiter or starter clutch as i call it. the spring has nowt to do with the freewheel (known as the 'inner gear') but fits strictly round the sprague bearing itself.

I'm having concerns though over two freewheels - brand new - that i have sold in the past 2 months, more of which in another thread i'll start soon enough. I have an engine coming back in destroyed and the problem (he says) is the freewheel losing some teeth and then jumping into the timing chain.

this happened to another customer last week, two teeth off the freewheel. cam timing changed = luckily that was all. i built the former and not the latter so, right now i have no proof of anything. both have had the torque limiter done though and one has the new spring and one the old way (shortening).

If it's confirmed, I will start a thread on 'Freewheel (teeth) problems'.

regards

Taffy
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