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Old 07-06-2010, 06:30 AM   #1 (permalink)
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Default Clutch vibration

Hhey guys, lately I've been noticing a vibrating sound that I think is coming from inside my clutch cover. It barely happens when i'm accellerating, but when I let off the gas and coast it's quite loud and noticeable. What I think it could be is the bearing carrier (metal guard thing that has the 4 bolts in it, mounts around the primary sheave). I think my bearing in the wet clutch cover could be going bad (getting loose) and when I let off the throttle and the belt starts to loosen up, the primary sheave shaft could be vibrating from the loose bearing and make the metal guard vibrate as well, since the tip of the shaft sits in a bearing in the guard. What do you guys think?
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Old 07-06-2010, 06:36 AM   #2 (permalink)
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Here's a link for the parts diagram:

http://www.cheapcycleparts.com/model_years/4798-yamaha-2002-grizzly-660-YFM660FP/assemblies/141299

If the bearing that the primary sheave shaft goes through (#19) in the wet clutch cover (#14) goes bad would it cause the shaft to vibrate when the belt tension lessens from deceleration? Since the shaft tip sits in the bearing (#29) in the bearing housing (#25), would this shaft vibration cause this bearing housing to vibrate real loud?
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Warn RT25 winch
Raptor Cam
Wiseco .080 over 11:1 piston
Hot Rods +4mm Stroker Crank
K&N
HMF Slip On
Aluminum Products full aluminum skid plates
ODI lock-on ATV grips
________________________________________________

05 Grizzly 660 SE:
Special Edition Black Metallic
27" ITP MudLites
Warn 2.5ci winch
Aluminum Products full aluminum skid plates
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Old 07-06-2010, 12:44 PM   #3 (permalink)
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The One-way bearing seems to be a weak link. I would look at it first. If the noises or vibrations only show up on decel, then it's probably the issue.

But if your going in that deep might as well replace the clutch housing bearing also. It's cheap insurance.
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Old 07-06-2010, 02:34 PM   #4 (permalink)
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Thanks Hillbrigger. I did just replace the one way bearing this past winter though because I lost my engine braking. At this time I noticed a tiny bit of play in the clutch housing bearing so I'm wondering if it got worse.
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02 Grizzly 720:
26" ITP MudLites
Warn RT25 winch
Raptor Cam
Wiseco .080 over 11:1 piston
Hot Rods +4mm Stroker Crank
K&N
HMF Slip On
Aluminum Products full aluminum skid plates
ODI lock-on ATV grips
________________________________________________

05 Grizzly 660 SE:
Special Edition Black Metallic
27" ITP MudLites
Warn 2.5ci winch
Aluminum Products full aluminum skid plates
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Old 07-15-2010, 11:16 AM   #5 (permalink)
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I took off the guard/bearing housing that mounts around the primary sheave and took the belt tension off of the pulley, and I was able to move the shaft with the sheave on it up and down. Not much but I think it could be causing the problem. I'll probably replace that bearing soon and hopefully it gets rid of the vibrations.
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02 Grizzly 720:
26" ITP MudLites
Warn RT25 winch
Raptor Cam
Wiseco .080 over 11:1 piston
Hot Rods +4mm Stroker Crank
K&N
HMF Slip On
Aluminum Products full aluminum skid plates
ODI lock-on ATV grips
________________________________________________

05 Grizzly 660 SE:
Special Edition Black Metallic
27" ITP MudLites
Warn 2.5ci winch
Aluminum Products full aluminum skid plates
Tusk heated grips/thumb warmer
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