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Good clutch plates

09 Dec 2020 18:43 09 Dec 2020 18:46 by willlgord.
willlgord
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Good clutch plates #1
I need a good set of friction plates for my at1 vintage race bike. I put a 175 reed cylinder on it that’s been ported and it runs really strong, I’ve been struggling to get the clutch slippage under control. I’ve put new eBay plates on it, added an extra metal plate, sandblasted all the metal plates to rough them up and shimmed the springs (which measured within specs) another .040”. I only have a problem when you really get on it, most of the time it’s ok. I see that vesrah-209 plates are recommended but can’t find them anywhere. The eBay plates were pretty cheap, around $30 so I’m not terribly surprised.

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09 Dec 2020 19:31
MarkT
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Good clutch plates #2
Barnett plates are known to grab very well.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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10 Dec 2020 09:21 10 Dec 2020 09:22 by Schu.
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Good clutch plates #3

willlgord wrote: I only have a problem when you really get on it, most of the time it’s ok.


Maybe you're just not hooking up. Are you roosting the guy behind you when it slips? :ROFLOL

Schu

70 Yamaha CT175
71 Yamaha CT175
71 Yamaha JT60
72 Yamaha JT60 (2)
74 Yamaha DT360
75 Yamaha GT80
75 Yamaha DT100
75 Yamaha DT125
75 Yamaha DT175
76 Yamaha DT175
75 Yamaha DT250 (2)
75 Yamaha DT400
76 Honda Z50
17 Yamaha SCR950

"Someday, you'll own some Yamahas"
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10 Dec 2020 10:03 10 Dec 2020 10:44 by RT360Fan.
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Good clutch plates #4

Schu wrote:

willlgord wrote: I only have a problem when you really get on it, most of the time it’s ok.


Maybe you're just not hooking up. Are you roosting the guy behind you when it slips? :ROFLOL


I thought of this too. A month or so ago I was on a ride, sort of felt like my clutch was slipping. Reality was the rear tire was 'floating' over the loam and spraying/roosting the guy behind me. Feels like the rear end is dancing; Full Tilt Boogie.

I use EBC clutch plates, they seem fine.

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10 Dec 2020 15:12
Pillsbury
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Good clutch plates #5
I use the Barnett Kevlar plates. Night & day from stock

1970 DT1-C Grand Prix race bike
1970 DT1-C Street tracker
1968 Honda CL90
1973 Honda CR250
1974 Honda MR-50
1966 Triumph Tiger Cub
1947 Mustang
1974 Suzuki TC185

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10 Dec 2020 16:02
JayB
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Good clutch plates #6
I have had good luck with Barnett, too. I recommend Barnett springs, too because they have a higher spring rate than stock.

You can try using Yamaha 401-16321-00 friction plates if you get rid of the rubber rings underneath the frictions. That will give you more surface area with the steel clutch plates, which could help especially with stronger springs.

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10 Dec 2020 16:12
JayB
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Good clutch plates #7

JayB wrote: You can try using Yamaha 401-16321-00 friction plates if you get rid of the rubber rings underneath the frictions. That will give you more surface area with the steel clutch plates, which could help especially with stronger springs.


I would caution against getting a later superseded number that the 401- number goes to!

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10 Dec 2020 18:01
willlgord
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Good clutch plates #8
Thanks for the suggestions, my clutch is definitely slipping.....not roosting! It’s time to get ready the bike ready for the 2021 race season, first race is in the middle of March. I’ve got a couple other things to sort out but nothing serious.

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11 Dec 2020 06:09
JayB
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Good clutch plates #9
Here is a picture of the original Yamaha replacement part for an AT1, which has space for the rubber ring underneath:


Versus the 401-16321-00 which was used on early MX and YZ 125s, which has no room for the rubber ring:


Hopefully the difference in friction area is apparent.

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12 Dec 2020 17:48
JayB
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Good clutch plates #10
The 537-16321-00 are still available from Yamaha. I bought a few and will report back if they fit in the 100,125 and 175s. Here are pictures:

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