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1975-76 DT400 fork oil weight?

02 Aug 2020 19:16 02 Aug 2020 19:19 by Bigdog302.
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1975-76 DT400 fork oil weight? #1
getting ready to rebuild the forks on the forks on the Super DT400 and I am wondering what weight fork oil you are running in your forks on mid 7 0's DT400s?

also what aftermarket fork springs do you suggest? I am planning to rebuild them with a Trick-IT fork kit I have.

2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
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04 Aug 2020 11:00
Shane86
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1975-76 DT400 fork oil weight? #2
I am running 10 weight and springs from race tech. I believe that are the same springs as the ttr125. At least the 74 DT250 is listed on the race tech site which should be the same springs as your 400. I did have to turn down the upper spring retainer to make the springs fit.
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07 Aug 2020 17:21 07 Aug 2020 17:26 by Bigdog302.
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1975-76 DT400 fork oil weight? #3
Thanks Shane! I will give that a try!

I found this page and they even list a setup there. www.racetech.com/ProductSearch/12/Yamaha/DT400/1975

Why did I not think of this? :huh:

2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
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10 Aug 2020 05:42
Shane86
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1975-76 DT400 fork oil weight? #4
I looked back at my notes and see I changed to 200cc 15w last change with the new springs. I don’t have much run time on this setup. I race vintage MX with this bike and weigh about 180 for reference.
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11 Aug 2020 11:41 11 Aug 2020 11:42 by Bigdog302.
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1975-76 DT400 fork oil weight? #5
I will need to run the heaviest springs due to my weight and The Trick -it fork kit says to run 30 weight for fork oil. I guess I will start there and work from there. Racetech has springs for my bike.

2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
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