Aftermarket Sprag clutch.Interested? - Page 16 - MVAgusta.net
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post #151 of 210 (permalink) Old 01-22-2017, 06:37 AM
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Hi there,

That newer sprag looks bigger in diameter and the housing has been undercut by the gears. Will be interesting to see how it goes. Hope it works out.

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post #152 of 210 (permalink) Old 01-23-2017, 12:02 PM
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Thank you so much for the detailed pictures. This gives me more of a warm fuzzy for work that I know is going to be unavoidable. Presently I think mine will last this upcoming season so I'll probably tackle this sometime in Dec. '17.

I particularly liked the comparison between new and old sprag. Was your old one very noticably bad when starting? How many miles? The vertical grooves are obvious but it also seems that the teeth on the old one are a bit more rounded on the corners. I don't know if that's the design or just wear over time.
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post #153 of 210 (permalink) Old 01-23-2017, 01:28 PM
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@kevjayney
Thank you so much for the detailed pictures. This gives me more of a warm fuzzy for work that I know is going to be unavoidable. Presently I think mine will last this upcoming season so I'll probably tackle this sometime in Dec. '17.

I particularly liked the comparison between new and old sprag. Was your old one very noticably bad when starting? How many miles? The vertical grooves are obvious but it also seems that the teeth on the old one are a bit more rounded on the corners. I don't know if that's the design or just wear over time.
My bike had just started mis behaving, so I bought a new battery thinking that was the problem as the battery is over 4 years old, but that did not solve the problem. I am going over to Almeria in Spain next month to do 4 days on track so I thought it best to replace the sprag after reading through the posts in this forum.

The bike has done about 6500mls.

There was no wear on the old sprag that I could see, it must just be the design of it. The bike has only been started to check if its ok, but never run on road or track yet, so hopefully it will be fixed.

Iam working away from home at the moment and the bike is at a friends place ready to be picked up and shipped to spain, but feel free to ask any questions.

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post #154 of 210 (permalink) Old 01-23-2017, 11:47 PM
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Originally Posted by Grakat View Post
Hi there,

That newer sprag looks bigger in diameter and the housing has been undercut by the gears. Will be interesting to see how it goes. Hope it works out.
Quote:
Originally Posted by Spark View Post
@kevjayney
Thank you so much for the detailed pictures. This gives me more of a warm fuzzy for work that I know is going to be unavoidable. Presently I think mine will last this upcoming season so I'll probably tackle this sometime in Dec. '17.

I particularly liked the comparison between new and old sprag. Was your old one very noticably bad when starting? How many miles? The vertical grooves are obvious but it also seems that the teeth on the old one are a bit more rounded on the corners. I don't know if that's the design or just wear over time.



You folks do realize that the sprag clutch cannot be seen in those pictures. The drive and driven gears can be seen, but the clutch is contained within.

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post #155 of 210 (permalink) Old 01-24-2017, 01:40 AM
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Hi there,

Yes I am aware the sprag itself cannot be seen. My observation was based upon what was visible in the photo, specifically that the root diameter in the gear was larger and as a result the teeth were undercut. I cannot form any further opinions without seeing the sprag itself, but they must have either increased the wall section diameter between the sprag running face and the outer gear, or the sprag mechanism is bigger.

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post #156 of 210 (permalink) Old 01-24-2017, 02:26 AM Thread Starter
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I have both original and upgraded sprag.The diameters are the same,you cannot go bigger.The only difference is the cut of the gear.


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post #157 of 210 (permalink) Old 01-24-2017, 02:36 AM
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The following pictures are the original sprag assembly and the upgraded version.The second picture (upgrade) has only one difference in that the driven gear has been strengthened and maybe different heat treatment? The one-way bearing is the same.
Original sprag
Attachment 347105
Upgraded sprag
Attachment 347113
Just a note,we found more wear on the upgraded driven gear than the original.But I have no idea that these sprags are out of the same bike.I was not given that information.
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I have both original and upgraded sprag.The diameters are the same,you cannot go bigger.The only difference is the cut of the gear.
Yes, thank you Mitch, looks like somebody wasn't paying attention earlier in the thread, or just jumped on the wagon at the last stop.
I'll start a new thread and put @kevjayney 's pictures in there, it's great for showing people how to replace the part without other nonsense.

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post #158 of 210 (permalink) Old 01-24-2017, 03:32 PM Thread Starter
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Yes, thank you Mitch, looks like somebody wasn't paying attention earlier in the thread, or just jumped on the wagon at the last stop.
I'll start a new thread and put @kevjayney 's pictures in there, it's great for showing people how to replace the part without other nonsense.

Thanks mate.I was trying to get kevjayney's pictures in the Tech tip section for future reference.


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post #159 of 210 (permalink) Old 02-27-2017, 08:34 PM
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I'm a late starter (no pun intended) to this thread, but for what it is worth, I have had the upgraded sprag in the bike for roughly 9000kms now. Over the last week, it has been sending out tell tale signs of a similar and imminent failure, so ...... I would definitely snap up one of yours Mitch. The sooner the better.

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post #160 of 210 (permalink) Old 02-27-2017, 08:59 PM Thread Starter
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I'm a late starter (no pun intended) to this thread, but for what it is worth, I have had the upgraded sprag in the bike for roughly 9000kms now. Over the last week, it has been sending out tell tale signs of a similar and imminent failure, so ...... I would definitely snap up one of yours Mitch. The sooner the better.

Sorry to disappoint you,but I don't make an upgraded sprag.I did all the homework and research but failed with the outcome.
You just have to stick with what MV has to offer at this stage.
Just make sure your battery is strong and fully charged.This will slow down any slippage/wear on your sprag.


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