CLUTCH AND BARNETT PLATES

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edward

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Jan 3, 2013
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I have two queries relating to my clutch:

Q.1 Why is the friction disc supposed to be the first one to go in the clutch basket, even if the friction material is softer it could pick up grit(I have an open primary) and act like a grinding wheel against the inside surface of the basket, also wouldn't it be rubbing against the screws which hold the housing in place? My VR880 actually has four friction discs and five plain plates and the plain plate is the first one but unfortunately I've just noticed this plate is not securely held by the splines but tends to jam into the slight recess behind the splines so I'm thinking of reverting? to five friction and four plain.

Q.2 The replacement Barnett plates I bought have a ring of twenty friction pads about 3/4 inch wide arranged around the outer circumference, but the ones in the bike have the friction material in four segments a little over an inch wide (hence a greater friction surface). Did I buy the wrong plates or are my original ones now superseded by the multi pad design?
 
I just installed the Barnett plates, same as you have. They replaced the type with a bit more surface same as you have.
I did take note the difference in area and wonder if slippage might be a problem with the new plates, especially since I added an extra steel plate to the back of the stack as a shim. This made the spring pressure very low, the clutch action is super light.
I tried very hard to make the new clutch slip yesterday and today, but no luck, it just holds firm.
So I would just put the plates in as per instructions and enjoy the new clutch. Try to get the stack height somewhere near the recommendations at Atlantic Green. I believe it is around 1.170 including the pressure plate. Mine came to 1.140, so 30 thou under, and it is just perfect.
The old worn out clutch stack measured 1.015 and this made the clutch action extremely heavy, 22 lbs pull needed at the end of the lever pre Venhill cable. Now it is about 4 lbs at end of lever to pull in.

Glen
 
edward said:
I have two queries relating to my clutch:

Q.1 Why is the friction disc supposed to be the first one to go in the clutch basket, even if the friction material is softer it could pick up grit(I have an open primary) and act like a grinding wheel against the inside surface of the basket, also wouldn't it be rubbing against the screws which hold the housing in place? My VR880 actually has four friction discs and five plain plates and the plain plate is the first one but unfortunately I've just noticed this plate is not securely held by the splines but tends to jam into the slight recess behind the splines so I'm thinking of reverting? to five friction and four plain.

Q.2 The replacement Barnett plates I bought have a ring of twenty friction pads about 3/4 inch wide arranged around the outer circumference, but the ones in the bike have the friction material in four segments a little over an inch wide (hence a greater friction surface). Did I buy the wrong plates or are my original ones now superseded by the multi pad design?
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1) because that's how clutches are designed, sacrificial friction material against hard steel/iron plates. The screws should be countersunk below the friction surface. It's fine. As for open primary, well, that's the compromise made when the design was modified to run open. Grit, stones, etc. The raceresque mystique. The difference observed in segmenting of plates is old versus newer Barnett. No drama.
 
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