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post #1 of 15 (permalink) Old 08-17-2015, 07:37 AM Thread Starter
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Question What are Shims

I have been looking at clutches trying to figure out what I'm going to get and one thing I notice that keeps popping up on the forums are shims for the clutch. What is the purpose of the shims and what benefits do they add as far as performance and reliability?

thanks,
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post #2 of 15 (permalink) Old 08-17-2015, 07:58 AM
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They are an inexpensive mod that open the spacing of your clutch wider for a lower starting gear at the the expense of slightly less high speed. Best used with a modified sheave like the Hunterworks sheave. They allow my rhino to achieve a 40% increase in gear reduction. See Shim mod link in my signature below.

http://www.ebay.com/itm/Yamaha-Rhino...9X8tsf&vxp=mtr

Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”

Last edited by TINKEN; 12-19-2016 at 05:07 PM.
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post #3 of 15 (permalink) Old 08-17-2015, 08:54 AM
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I send a pm to Todd seeing if sold them without buying his sheave kit haven't heard back yet

727 102.5 cp big bore 11:1 , Camshaw built , Hotcams stage 1, Alba exhaust, Hsr 45, Air intake, Dynatek cdi, Orange clutch spring, Hunterworks sheave & slug kit- Tinken clutch mods
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post #4 of 15 (permalink) Old 08-17-2015, 10:59 AM
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post #5 of 15 (permalink) Old 08-17-2015, 11:52 AM
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Quote:
Originally Posted by Mikeymuy View Post
I send a pm to Todd seeing if sold them without buying his sheave kit haven't heard back yet
Hunterworks does sell them separate, they are an OEM Yamaha part.

If Todd doesn't have the size you need, I have them as sets of two for 3 bucks, both in 18-8 stainless steel at 0.2mm and 0.5mm because nobody's output shaft is the same and often requires fine tuning to shim the desired width. Pretty simple, just don't want to run out of splines at the end of your shaft and you don't want to hit your spider/belt cover, hence the fine tuning. Easier with Hunterworks sheave because there is no grease cover on the end of the clutch.



Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”

Last edited by TINKEN; 08-17-2015 at 12:02 PM.
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post #6 of 15 (permalink) Old 08-17-2015, 12:17 PM
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^ how much you think would be good to add to a shock (mm) sheave Micheal?

727 102.5 cp big bore 11:1 , Camshaw built , Hotcams stage 1, Alba exhaust, Hsr 45, Air intake, Dynatek cdi, Orange clutch spring, Hunterworks sheave & slug kit- Tinken clutch mods
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post #7 of 15 (permalink) Old 08-17-2015, 12:19 PM
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Here's a few more pictures to explain the process. Lower take off, even in high range puts less stress on your belt and wet clutch. For me, I like the reliability this gives and don't care about a few mph extra that I probably won't use anyway.

Without shims:



With shims:


Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”
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post #8 of 15 (permalink) Old 08-17-2015, 12:37 PM
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Quote:
Originally Posted by Mikeymuy View Post
^ how much you think would be good to add to a shock (mm) sheave Micheal?
If your belt doesn't rise too far out of your secondary clutch to rub on your belt case, I have seen additions between 0.5-1.8mm (2.2mm for me because I don't use a cvt cover).

For lack of better pictures, these will have to do. Notice there is a space between the outside belt surface and your cvt cover. You need to keep your outer belt from rubbing that case by adjusting your shim count.

Here is with no shims:


Here is with some shims:


Here is with maximum shims:


It's a really inexpensive mod, but it will take a little bit of Tinkering with to get the most out of it. Your belt moves lower in the primary and higher in your secondary clutch, therefor yielding lower take off torque.

Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”
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post #9 of 15 (permalink) Old 08-17-2015, 04:00 PM
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I don't run a cover either

727 102.5 cp big bore 11:1 , Camshaw built , Hotcams stage 1, Alba exhaust, Hsr 45, Air intake, Dynatek cdi, Orange clutch spring, Hunterworks sheave & slug kit- Tinken clutch mods
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post #10 of 15 (permalink) Old 08-17-2015, 04:08 PM
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Quote:
Originally Posted by Mikeymuy View Post
I don't run a cover either
Well then... Haha. You can shim it until it looks like this:


Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”
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post #11 of 15 (permalink) Old 08-18-2015, 04:46 AM
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Quote:
Originally Posted by Mikeymuy View Post
I send a pm to Todd seeing if sold them without buying his sheave kit haven't heard back yet
I just did, I normally only get on here in the AM but get emails about messages, didn't get one.

Todd
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post #12 of 15 (permalink) Old 08-21-2015, 09:35 PM
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Shims added to a stock clutch (1.5mm), no machining to allow the belt to run to the top of the primary. But there's an added amount of bottom end. With a machined clutch, belt travel is both lower and higher.


Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”

Last edited by TINKEN; 08-22-2015 at 03:26 AM.
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post #13 of 15 (permalink) Old 08-22-2015, 03:20 AM
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I only have a 450 and 660, so I was wondering how much clearance there is on a Rhino 700. Best picture I could find. It appears there is room for shims, but maybe someone has a better image?


Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”
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post #14 of 15 (permalink) Old 08-22-2015, 05:52 AM
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Quote:
Originally Posted by Tinken View Post
Shims added to a stock clutch (1.5mm), no machining to allow the belt to run to the top of the primary. But there's an added amount of bottom end. With a machined clutch, belt travel is both lower and higher.

https://www.youtube.com/watch?v=ngS2sJaeIAU
You said the 1.5 mm shim on a stock clutch allows the belt to run to the top of the primary, actually just shims on a stock clutch it would run lower on the primary and higher on the secondary and decrease top speed but agreed more bottom end.

That is why the machined sheave is the better mod all be it more money but you lose nothing.

Im not writing this to you, it was to anyone reading your comment I am pretty sure you mean secondary and typed primary.

Todd
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post #15 of 15 (permalink) Old 08-22-2015, 06:52 AM
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I meant that since the sheave in the video is stock, there is no machining to allow the belt to run to the top of the primary sheave. As seen in the video, the belt is down 0.25" from the top.

The shims in conjunction with a machined sheave is a better mod when applicable. For instance if you have over sized tires, you are likely not going to be able to use your top speed and tuning your clutch for a little more bottom end would be to your advantage.

Sheave Mods,ShimMod SlipperyWashers WetClutch Manuals: 450, 660, 700.

“Quality is never an accident, it is always the result of intelligent effort.”
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