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Makotosun

DT400 Head Gasket reusable?

  • Clegg
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DT400 Head Gasket reusable? was created by Clegg

I pulled the head on my 75 DT400. Is the copper head gasket is reusable on this model?

Torque to 15 ft lbs cross pattern?
1971 SL350, 1973 Bultaco Matador, 1978 XS650, 1979 MX175, 1982 XT250, 1982 GS650, 1982 CB450T HAWK, 1979 IT175, 1977 Suzuki TS185
Last edit: 02 Aug 2023 13:13 by Clegg.
02 Aug 2023 13:08 #1

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Replied by Tinkicker on topic DT400 Head Gasket reusable?

It is if you anneal it.  Heat it up with a blow torch till it takes on a very dull red glow and drop it in a bucket of water.
or if you have an infra red thermometer, heat it to 500C or so.
Last edit: 02 Aug 2023 13:19 by Tinkicker.
02 Aug 2023 13:17 #2

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  • Clegg
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Replied by Clegg on topic DT400 Head Gasket reusable?

I did that with my mapp gas torch.

Head bolt torque 15 ft lbs?
1971 SL350, 1973 Bultaco Matador, 1978 XS650, 1979 MX175, 1982 XT250, 1982 GS650, 1982 CB450T HAWK, 1979 IT175, 1977 Suzuki TS185
Last edit: 02 Aug 2023 13:24 by Clegg.
02 Aug 2023 13:23 #3

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Replied by Tinkicker on topic DT400 Head Gasket reusable?

Dunno.  There is a full service manual for it, all ready to download in the tech library.
02 Aug 2023 13:50 #4

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Replied by Clegg on topic DT400 Head Gasket reusable?

For reference.

Looked in the manual under engine rebuild, but found the spec in the front few pages. 2.1-2.5 M-KG which converts to 15.189329 to 18.082 ft lbs.

The cylinder torque spec is 30 to 32 ft lbs. 

 
1971 SL350, 1973 Bultaco Matador, 1978 XS650, 1979 MX175, 1982 XT250, 1982 GS650, 1982 CB450T HAWK, 1979 IT175, 1977 Suzuki TS185
Last edit: 02 Aug 2023 14:09 by Clegg.
02 Aug 2023 14:01 #5

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Replied by msavitt on topic DT400 Head Gasket reusable?

8mm head bolts on many of my bikes are 15 ft lb in manual 

I always anneal and reuse my head gaskets by heating.  But I don’t quench, so maybe I am not doing it properly?
02 Aug 2023 22:41 #6

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Replied by Tinkicker on topic DT400 Head Gasket reusable?

Does not really matter either way.  I just like to clear anything hot away ASAP.  I have a tendency to find hot metal when I am not paying attention...
03 Aug 2023 02:13 #7

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Replied by RT325 on topic DT400 Head Gasket reusable?

Yep was tought to go cherry red then in a bucket of water. Well think thats how i was tought so is how i've always done it. Works great. Oh, & i grease it on assembly too.
04 Aug 2023 05:08 #8

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