clutch input
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Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
clutch input
Hi guys, need a bit of input about a 1990 clutch.
I'm not exactly sure if I need a clutch pack or not I went by the service manual for checking things over.
The manual says stack height for the 8 friction plates (9) is 0.661 and I get 0.631. I checked the steel plates (10)are all flat. I replaced the double row ball bearing (15). Basket surface where plates ride does have some tick marks from wear but nothing serious.
I did get a new pressure plate because the surface area where the friction plate touches was not flat and only touched on the inner and outer edge of the pressure plate. The ring gear is in not bad shape along with chain and basket and front sprocket teeth, all straight.
The diaphragm spring (3) does not sit flat on a sheet of glass but service manual doesn't mention that it should be flat but only to check for cracks or bent tabs, its the black one so I'm assuming its stock.
If you's recall I previously had a post about clutch grabbing while disengaging into first gear. This clutch should have 8 friction plates and 6 steel plates and a spring plate (11) but the spring plate IS NOT in the stack and there is actually 8 steel plates and 9 friction plates, the added plates I'm assuming was to make up the differnce with the spring plate being taken out, and I'm thinking this throws out the service manual measurement for min. stack height of 0.661.
What I'm really curious about is the diaphragm spring (3), should it not sit perfectly flat on a sheet of glass so when its compressed to engage clutch all clutch pack is compressed evenly?
I'm not exactly sure if I need a clutch pack or not I went by the service manual for checking things over.
The manual says stack height for the 8 friction plates (9) is 0.661 and I get 0.631. I checked the steel plates (10)are all flat. I replaced the double row ball bearing (15). Basket surface where plates ride does have some tick marks from wear but nothing serious.
I did get a new pressure plate because the surface area where the friction plate touches was not flat and only touched on the inner and outer edge of the pressure plate. The ring gear is in not bad shape along with chain and basket and front sprocket teeth, all straight.
The diaphragm spring (3) does not sit flat on a sheet of glass but service manual doesn't mention that it should be flat but only to check for cracks or bent tabs, its the black one so I'm assuming its stock.
If you's recall I previously had a post about clutch grabbing while disengaging into first gear. This clutch should have 8 friction plates and 6 steel plates and a spring plate (11) but the spring plate IS NOT in the stack and there is actually 8 steel plates and 9 friction plates, the added plates I'm assuming was to make up the differnce with the spring plate being taken out, and I'm thinking this throws out the service manual measurement for min. stack height of 0.661.
What I'm really curious about is the diaphragm spring (3), should it not sit perfectly flat on a sheet of glass so when its compressed to engage clutch all clutch pack is compressed evenly?
Road Warrior
Joined: Dec 2010
Posts: 1,268
Likes: 507
From: Florida
The diaphram should be arced or (Concave/Convex) If its flat its toast. To get your stack height correct add a steel disc of the correct thickness.
The extra steel disc would go on either end of the stack next to another steel disc.
Sounds like somebody has upgraded the clutch, from your disc and plate count.
The extra steel disc would go on either end of the stack next to another steel disc.
Sounds like somebody has upgraded the clutch, from your disc and plate count.
Last edited by V-Twins & Bowties; Feb 13, 2011 at 05:43 PM.
Thread Starter
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Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
The diaphram should be arced or (Concave/Convex) If its flat its toast. To get your stack height correct add a steel disc of the correct thickness.
The extra steel disc would go on either end of the stack next to another steel disc.
Sounds like somebody has upgraded the clutch, from your disc and plate count.
The extra steel disc would go on either end of the stack next to another steel disc.
Sounds like somebody has upgraded the clutch, from your disc and plate count.
Thread Starter
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Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
Yes but if mushroom top is facing up should the base not be flat sitting on a sheet of glass and have no rocking motion?
Thread Starter
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Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
This is the 1990 clutch there is no bolts to hold down diaphragm spring, to remove the diaphragm spring part number 3 I use a tool to compress the clutch and remove the retaining ring and seat ring.
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Road Warrior
Joined: Dec 2010
Posts: 1,268
Likes: 507
From: Florida
Ok. works the same way only your using the retaining ring and seat ring to flaten the diaphram spring.
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Cruiser
Joined: Feb 2010
Posts: 105
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From: north eastern Pa.
Be sure to check the hub "finger" to make sure there isn't any "saw teeth" marks in it.
The fiber plates will chatter agains the hub and make them.
If they are TOO bad you can file them out, (very carefully).
The fiber plates have to slide againt the hub easily to release.
I like to put my clutches all together and work it a few times to make sure they seperate, checking in a few places with a feeler gauge.
Joe
Any advice I give should be taken with a can of beer-er 2!
Real men ride bikes with carbs!
The fiber plates will chatter agains the hub and make them.
If they are TOO bad you can file them out, (very carefully).
The fiber plates have to slide againt the hub easily to release.
I like to put my clutches all together and work it a few times to make sure they seperate, checking in a few places with a feeler gauge.
Joe
Any advice I give should be taken with a can of beer-er 2!
Real men ride bikes with carbs!
Thread Starter
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Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
So after alot of thought and the measurement I got when I measured the stack height I decided to order a new clutch pack as well as the spring plate AKA diaphragm spring.
I will give a closer look to the splines where the plates ride ane file any wear nicks.
I will give a closer look to the splines where the plates ride ane file any wear nicks.