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Makotosun

AT-2 Steel Clutch Plate

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AT-2 Steel Clutch Plate was created by MikeC

I am putting an AT-2 back together after replacing all the lip seals and inspecting the gearbox and crank assy.  I just noticed I only have five steel and five fiber clutch plates.  The exploded view for the bike in Partzilla shows five plates each and the first steel at the bottom of the transmission hub - with the outer fiber running directly on the pressure plate.  Is this correct?

I worked for a a manufacturer of commercial automatic truck, off highway and military transmissions for thirty years and we never ran fiber on aluminum.  Fiber always ran on steel (or in some cases machined cast iron).  Just checking to make sure the parts catalog exploded view and parts list/count is correct.  Thanks!
29 Sep 2023 08:59 #1

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Replied by MarkT on topic AT-2 Steel Clutch Plate

Parts Diagram is incorrect.  Stack starts with fiber and ends with steel on the earlier models as the pressure plate is not splined to the inner hub like it was on later models. 

But yes, you still have aluminum on fiber. 

Here are some engineering drawings.

F= Friction, S=Steel, and R=rubber cushion ring (which many of us leave out, and sometimes must be left out with aftermarket discs)

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Also make sure if you have new discs that thickness is correct spec (3mm).  Yamaha went to thinner frictions on later models

Also note that the flat thrust bearing has a steel washer on both sides.  The parts diagram only shows one washer but one of the two washers is supplied with the flat bearing. 

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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
The following user(s) Liked this Post: swm, Gr8uncleal, Ht1kid, MikeC
Last edit: 29 Sep 2023 09:26 by MarkT. Reason: Fixed mistake
29 Sep 2023 09:22 #2

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Replied by MikeC on topic AT-2 Steel Clutch Plate

Thanks Mark. I have a shop manual with the sectional view you included - but didn't think to check it. That helps a bunch. I do have the 3mm spacer/washer and the thrust bearing does have the thin loose race on the other side. Are you saying there should be two loose races? In other words, is the assembly sequence, 3 mm spacer, loose race, thrust bearing, loose race, hub? If that's the case, I am missing a loose race.

The shop manual doesn't have any torque values, but searching on the forum in the tech data section, I found a manual that called out 80 Nm for the hub nut torque - so that's what I used.

Thanks again - I greatly appreciate your help. Take care.
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29 Sep 2023 11:30 #3

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Replied by MarkT on topic AT-2 Steel Clutch Plate

Bearing comes with the one thin washer which goes on first...  then the flat roller bearing...  then thicker washer with ID smaller than the tall spacer the bearing and thin washer fit over.  So you're not missing anything if you have one washer on each side of flat bearing. 

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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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29 Sep 2023 12:50 #4

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