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Wolverine X2/X4 clutch mods

This is a discussion on Wolverine X2/X4 clutch mods within the X2/X4 CVT, Sheaves & Wet Clutch forums, part of the Yamaha Wolverine X2 & X4 847cc SxS category; The roller flat spotting, which should be renamed to 'scalping' for the X2/X4 is caused by the roller reaching the end of the cam plate ...

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Thread: Wolverine X2/X4 clutch mods

  1. #51
    Super Moderator MassiveOverkill's Avatar
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    The roller flat spotting, which should be renamed to 'scalping' for the X2/X4 is caused by the roller reaching the end of the cam plate where the sharp edge cuts the roller when you decelerate and the roller returns back into the sheave.

    This picture the foreground cam plate channel is out of focus but if you look at the one behind it you can see how sharp it is and you can see that my rollers are getting full travel from the wear marks.



    Here I've taken a file at 45 degrees to remove the sharp edge.



    For those of you who think OD weights won't get scalped, think again, although it's not from bad castings. My roller channels were nice and smooth and even if they weren't to begin with, they would have been worn smooth and scalping still occurred.



    If all you do is low speed riding you may never see this. Grease doesn't mitigate it as I've had it happen on my stock vehicle with OEM rollers and grease before I switched to HV weights and a machined sheave and obviously JBS always uses grease. This is much more likely to happen with a machined sheave as the weights are pushed closer or even past the cam plate edge.
    Last edited by MassiveOverkill; 06-14-2019 at 07:43 AM.
    shortbus453 and DWRAT like this.
    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

  2. #52
    Moon Shiner DWRAT's Avatar
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    Putting a file on that edge as Todd says should prevent this hopefully.
    MassiveOverkill likes this.
    2019 X2 SE Black
    29x9-14 all around.

  3. #53
    Super Moderator MassiveOverkill's Avatar
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    InfidelMT, if you don't want to file your cam plate that's fine. OD weights aren't immune to it so enjoy your scalped OD weights. It's not something unique to a Hunterworks setup



    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

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  5. #54
    Super Moderator MassiveOverkill's Avatar
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    One thing I want to reiterate with more doing sheave work is the primary bearing support bracket or spider cage... this piece:



    If you re-grease/repack the bearing, install it a couple times fully seated over the primary shaft and remove it and make sure the hydraulic pressure doesn't push the rubber seal up, bending the seal retainer bracket.

    There are two thin-walled positioning sleeves installed on the longer bolt locations. Those sleeves are a tight fit and it's possible to install the bearing support cage skewed because they go in cockeyed. I now grease them so they go in a little easier into the holes. When I'm installing the bearing support cage I'll put it into place and gently tap it into place with a rubber mallet on the center to make sure it's fully seated before installing the bolts. I then install the bolts by hand and they should bottom out all the way with little resistance and it then only takes a couple turns of my ratchet to tighten them.

    If you don't bottom out that bearing support cage first and use the bolts to seat it, that's when you have the possibility of installing the bearing support cage cockeyed. The results of either the rubber seal\retainer being cockeyed or the bearing support cage being cockeyed can mean an early wet clutch death. On my X4 one dowel was stuck in the cage and one was stuck in the CVT metal boss so it made it harder to install correctly. The sleeves are so thin, handling them with a set of pliers mars them up.
    Last edited by MassiveOverkill; 06-19-2019 at 09:40 AM.
    338weatherby and DWRAT like this.
    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

  6. #55
    Supporting Member 338weatherby's Avatar
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    Quote Originally Posted by MassiveOverkill View Post
    One thing I want to reiterate with more doing sheave work is the primary bearing support bracket or spider cage... this piece:



    If you re-grease/repack the bearing, install it a couple times fully seated over the primary shaft and remove it and make sure the hydraulic pressure doesn't push the rubber seal up, bending the seal retainer bracket.

    There are two thin-walled positioning sleeves installed on the longer bolt locations. Those sleeves are a tight fit and it's possible to install the bearing support cage skewed because the go in cockeyed. I now grease them so they go in a little easier into the holes. When I'm installing the bearing support cage I'll put it into place and gently tap it into place with a rubber mallet on the center to make sure it's fully seated before installing the bolts. I then install the bolts by hand and they should bottom out all the way with little resistance and it then only takes a couple turns of my ratchet to tighten them.

    If you don't bottom out that bearing support cage first and use the bolts to seat it, that's when you have the possibility of installing the bearing support cage cockeyed. The results of either the rubber seal\retainer being cockeyed or the bearing support cage being cockeyed can mean an early wet clutch death. On my X4 one dowel was stuck in the cage and one was stuck in the CVT metal boss so it made it harder to install correctly. The sleeves are so thin, handling them with a set of pliers mars them up.
    Thanks Massive. This good info before I install my new sheave. I was planning on using my cordless driver and after reading this, I won’t be.


    Sent from my iPhone using Tapatalk
    MassiveOverkill likes this.
    2018 Wolverine X4 SE Matte/Orange
    OEM glass windshield
    OEM rear glass
    OEM front/rear A arm guards
    OEM front bash plate
    OEM front brush guard
    4500lb Warn VRX
    EMP side mirrors
    28"x 10" x 14" Carnivores w/ MSA M39 wheels with 1-1/2" spacers in rear
    2” Super ATV lift
    HMF Titan slip on exhaust
    Weller ECU reflash
    Hunterworks sheave w/18gr weights

  7. #56
    Super Moderator MassiveOverkill's Avatar
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    Will Griffin's test results (he's not on WolverineForums unfortunately)





    2018 Blue Wolverine X4
    First Wolverine X4 to break the 60 MPH barrier
    Over 6000 miles and 425 hours
    Hunterworks prototype sheave with easy cleanout port, 22 gram HV weights
    Weller Racing ECU flash
    HMF Titan Series Quiet slip-on Exhaust
    Walker Evans shocks
    Swiss-cheesed airbox lid
    NGK Laser Iridium spark plugs
    Tinkseal additives
    STI HD beadlocks wearing Tusk Terrabite 27x9x12 tires
    OEM windshield, soft cab, and roof
    OEM skid plates
    OEM rock sliders
    OEM A-arm guards
    OEM cargo box
    Check out the Yamaha X2/X4 FB group: https://www.facebook.com/groups/671163569748779/

  8. #57
    Moon Shiner DWRAT's Avatar
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    That is a GREAT wright up.
    Thanks, Will
    MassiveOverkill likes this.
    2019 X2 SE Black
    29x9-14 all around.

  9. #58
    Supporting Member 338weatherby's Avatar
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    Just finished my install of the Hunterworks sheave and 18gr weights tonight as well. It just turned midnight here so I won’t be running it until tomorrow sometime. Great service and fast shipping. Got it Monday but didn’t have time to install until tonight. Total time was about 2.5 hours. Not bad.


    Sent from my iPhone using Tapatalk
    2018 Wolverine X4 SE Matte/Orange
    OEM glass windshield
    OEM rear glass
    OEM front/rear A arm guards
    OEM front bash plate
    OEM front brush guard
    4500lb Warn VRX
    EMP side mirrors
    28"x 10" x 14" Carnivores w/ MSA M39 wheels with 1-1/2" spacers in rear
    2” Super ATV lift
    HMF Titan slip on exhaust
    Weller ECU reflash
    Hunterworks sheave w/18gr weights

  10. #59
    Supporting Member 338weatherby's Avatar
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    Just finished my install of the Hunterworks sheave and 18gr weights tonight as well. It just turned midnight here so I won’t be running it until tomorrow sometime. Great service and fast shipping. Got it Monday but didn’t have time to install until tonight. Total time was about 2.5 hours. Not bad.


    Sent from my iPhone using Tapatalk
    2018 Wolverine X4 SE Matte/Orange
    OEM glass windshield
    OEM rear glass
    OEM front/rear A arm guards
    OEM front bash plate
    OEM front brush guard
    4500lb Warn VRX
    EMP side mirrors
    28"x 10" x 14" Carnivores w/ MSA M39 wheels with 1-1/2" spacers in rear
    2” Super ATV lift
    HMF Titan slip on exhaust
    Weller ECU reflash
    Hunterworks sheave w/18gr weights

  11. #60
    Slow Poke Firefly's Avatar
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    Looking forward to hearing your review.
    2019 Wolverine R-Spec SE, Matt Black
    Full Hard Cab Enclosure, Factory Heater, Viper Elite 4500 lbs Winch, Assault Side Mirrors, OEM Storage Box
    HighLifter 3.5" Lift Kit, Weller Racing ECU flash, HMF Exhaust

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