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78 IT400 Engine service manual

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78 IT400 Engine service manual was created by Blazer

 Hello, I need to rebuild the crank on my IT400 which means splitting the cases. I need a service manual for this year. I looked in the Tech section and dont see one. Is it the same as a YZ of similar year? I have never done this so any help suggestions , Thanks! 
23 May 2023 09:57 #1

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Replied by Blazer on topic 78 IT400 Engine service manual

Can anyone confirm which manual I need? Do I need a 77 DT400 manual for a lower end rebuild?
25 May 2023 10:27 #2

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Replied by MarkT on topic 78 IT400 Engine service manual

You can compare the pictures of your engine to the 77 DT250/400 manual in the Tech Library.

Yamaha generally did not make IT or YZ Service Manuals in those years... Owner's manual went into more detail about maintenance and tuning of clutch/carb/shock/etc. than a normal owner's manual. DT manual was what you used for major teardown of engine. (DT models in that era were just a "detuned" version of the YZ/IT race bikes)
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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25 May 2023 11:57 #3

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Replied by Blazer on topic 78 IT400 Engine service manual

Thats what I needed to know! Thanks MarkT!
25 May 2023 21:45 #4

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