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Makotosun

Gasket Installation Help Please

  • Brzn
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Gasket Installation Help Please was created by Brzn

Once I got my DT2 running after sitting for 27 years, I had a small leak of 2-Stroke oil from the base of the cylinder. Last winter I replaced the base and head gaskets installing the base gasket dry, nothing on it. Both mating surfaces were clean. Well this year it leaked, more than originally. Once I'd installed the gasket I torqued the head bolts to the recommended 30 foot pounds, then ran it through a couple heat cycles and retorqued the head, ran it through another couple heat cycles and checked the head bolts torque again and they were all fine.

I've purchased another set of base and head gaskets and plan to remove the cylinder again this winter. Should I apply something to the base gasket this time to keep it from leaking? Grease? High Tack Gasket Sealant? Something else?
22 Dec 2023 07:33 #1

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Replied by MarkT on topic Gasket Installation Help Please

I've been using a thin coat on both sides of the intake and base gaskets of the same special gray semi-hardening sealer used to assemble the center cases... Yamabond, Permatex MotoSeal, or Three Bond equivalent. (Pretty sure Three Bond makes Yamabond)

I pressure test after fresh assembly and without a little sealer on the base gasket and reed valve, I've almost always had a small air leak or two right after assembly... especially the reed valve intake. In my experience, air leaks never fix themselves, they get worse with time.
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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22 Dec 2023 07:47 #2

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Replied by 1971DT250 on topic Gasket Installation Help Please

Ditto on what Mark said.
Are you using Yamaha OEM gaskets?
I've had trouble with aftermarket cylinder base gaskets on 2 of my RT3s installed by the previous owners. Replaced them with OEM.
The hours spent riding my Enduros is not deducted from my life span.
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Last edit: 22 Dec 2023 15:30 by 1971DT250.
22 Dec 2023 14:35 #3

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Replied by Brzn on topic Gasket Installation Help Please

Hmm...
I bought the gasket off eBay and don't believe it's Yamaha branded.
23 Dec 2023 06:34 #4

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Replied by Ht1kid on topic Gasket Installation Help Please

Brzn you can go to a NAPA store and buy some good gasket material and make your own and use yamabond that’s what I do 
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23 Dec 2023 08:56 #5

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Replied by RT325 on topic Gasket Installation Help Please

Probably not what you really want to do--but on my YZ490 it used to suck in the base gasket along the side at the transfers.
So bought an old stock roll of gasket paper [cheap] slightly thicker than original & made a gasket a bit larger sticking out along the sides so when tightened down it left a very slight step & theoretically couldn't get sucked in.
Worked for me & wasn't that noticeable unless you got down close for a look.
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23 Dec 2023 15:29 #6

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Replied by Brzn on topic Gasket Installation Help Please

Which Yamabond do I want for the cylinder base gasket to crankcase? On eBay I see there's a Yamabond 4, 5 and 6B. Then applied to both sides of the gasket?
Last edit: 15 Feb 2024 04:25 by Brzn.
15 Feb 2024 04:25 #7

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Replied by MarkT on topic Gasket Installation Help Please

I use the semi-hardening which I believe is #4

Permatex Motoseal is in stock at auto parts stores near me and is what I've used the last several years. 
 
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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15 Feb 2024 04:56 #8

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Replied by Paul@PJME on topic Gasket Installation Help Please

This is not a sales Ploy at all, but i use this on all paper type gaskets, I have found it very good. On some of the cheaper non coated paper gaskets, i give it a good soaking as it draws in in much more.

www.pjme.co.uk/acatalog/Loctite-Gasket-A...ay-1557.html#SID=655

I am sure you may find it Local to you
15 Feb 2024 12:12 #9

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Replied by automan on topic Gasket Installation Help Please

Indian Head
17 Feb 2024 00:13 #10

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