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Reusing CT-1 case gasket? Dry, or grease?

  • Tom P
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I'm replacing my CT-1 clutch friction plates after 2+ years (and almost 3K miles). Last ones were aftermarket 5 for $14, this time I have OEM, for 5 for $60. Already have the old ones out, scuffed the steels, and the new ones are soaking in oil for wet clutches. Last time I put a new gasket on and lightly greased each side. The gasket still looks good, and came off easily. I have a new one, but was thinking of reusing the old one anyway, and wondered how many here do that, and if you install them wet, dry, with grease, or with sealant? BTW it wasn't really leaking that I could tell, and the mating surfaces are still very clean (I cleaned them well after getting the original gasket off 3 years ago).
14 Jun 2025 13:11 #1

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I have reused case gaskets, that were in good condition, many times without any problems. I would make sure that both sides of the gasket were wet with oil before installing.
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14 Jun 2025 13:57 #2

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Replied by MarkT on topic Reusing CT-1 case gasket? Dry, or grease?

Yes, I grease gaskets and re-use them if in good shape too...  it's an old trick I learned from a Swedish Factory Husqvarna mechanic at the track back in the 1970's.
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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14 Jun 2025 14:18 #3

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Replied by Tom P on topic Reusing CT-1 case gasket? Dry, or grease?

HOLY COW! What a difference OEM friction plates make! I should have done this a couple years ago. They do not slip at all, and it engages so firmly I can't believe it! Now I can't be sloppy when taking off in first gear, or I might stall it. Before I didn't even have to think about it.

 I appreciate the responses, but in the end I decided to go ahead and put the new gasket on, and dry this time. Seems to be sealing so far, and I have fresh oil in the gearbox as well.  But for anyone that reads this in the future, if you're thinking of getting those cheap aftermarket clutch plates on eBay, don't do it! In fact when I compare them now to the OEM, there's a bit more surface area on the OEM, as well as looking like a different kind of material. Of course it could be that I just got a bad brand, but I'm going to stick to OEM from now on
The following user(s) Liked this Post: CT1Fan, Schu, Ht1kid, Sneezles61, pahiker
Last edit: 14 Jun 2025 17:02 by Tom P.
14 Jun 2025 17:01 #4

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Replied by MarkT on topic Reusing CT-1 case gasket? Dry, or grease?

Great news Tom!  
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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14 Jun 2025 17:22 #5

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Replied by Tom P on topic Reusing CT-1 case gasket? Dry, or grease?

Did another long ride today. Even top speed is increased! I can hit 65 on the speedo (which is really closer to 62) but couldn't do that before. I think it was continually slipping, especially into a head winds.

I got lucky too... the plates were on sale for around $11 each, with a free shipping promotion. Now they're listed at $24 each!

www.partzilla.com/search?q=3HA-16321-00-...eahead&use_fitment=1

imgur.com/a/2bHca55
The following user(s) Liked this Post: Schu, Sneezles61
Last edit: 15 Jun 2025 14:53 by Tom P.
15 Jun 2025 11:13 #6

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You did good on that price. I recently paid in the higher price range for my Yamaha frictions.
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
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15 Jun 2025 14:51 #7

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Replied by Tom P on topic Reusing CT-1 case gasket? Dry, or grease?

Yeah I can't believe the price I got. The funny thing is, I had those in my cart on Partzilla from about 6 months ago. I don't remember now if they were on sale when I put them in the cart, or if the price dropped since. When I opened up the cart and saw them for around $11 bucks each, I thought what the heck, that's not bad! Then I click on the link today and they're $24 again. That's why I didn't order OEM plates back when I first started working on this CT-1. I was having to do so much to it I was penny pinching, not being sure if I would even get it running.
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15 Jun 2025 15:00 #8

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Replied by CT1Fan on topic Reusing CT-1 case gasket? Dry, or grease?

Just an FYI regarding Partzilla. My experience has been if you can buy it on Partzilla your local Yamaha dealer can get the parts as well w/o shipping costs.
2019 Triumph Bonneville T120*
2016 Indian Chieftain Dark Horse
1971 Yamaha DT1E*
1970 Yamaha 175 CT1b*
2016 Indian Chief Dark Horse
2010 Triumph Bonneville T100
1993 BMW K75
1999 Honda Shadow 750
1973 Yamaha 360MX
1978 Honda CB400f
1976 Honda CB400f
1974 CZ 400MX
1968 Yamaha 250 DT1
*=Currently Own
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Last edit: 15 Jun 2025 20:48 by CT1Fan. Reason: misspelled word
15 Jun 2025 20:47 #9

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Replied by automan on topic Reusing CT-1 case gasket? Dry, or grease?

Copper spray a gasket.
2 coats and let it dry, then assemble.
The following user(s) Liked this Post: Rick C.
17 Jun 2025 07:07 #10

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