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1975 Dt 400 crank shim

08 Aug 2020 03:14
Bombo
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1975 Dt 400 crank shim #1
Hi there,

Can anyone tell me if all 1975 dt 400’s have a crank shim or was it a case by case basis. Mine does not however that does not say that there may have been one originally and a previous owner not re installed it.
The parts list does not show a shim however the workshop manual mentions the shim.
Any assistance would be much appreciated. Thanks

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08 Aug 2020 07:34
Pedalcrazy
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1975 Dt 400 crank shim #2
I rebuilt my 76 DT400 about three years ago and I recall it had a shim. I'm sorry to say that I can't recall which side. I put it back like I found it. I just looked up my old Yamaha parts manual for the 75 DT400B and it doesn't show one for the crank assembly. I thought maybe it would reference it as U. A. R. (Use as required) like they do for certain other parts. Can't help you after all.

1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B

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08 Aug 2020 08:23
MarkT
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1975 Dt 400 crank shim #3
Shim is on the primary gear side on the ones I've seen. Often, crank will rub the case if you forget it.

DEET might have the shims. He's posted a few times on the topic. Requires some precision measuring of crank width and distance between bearings to determine shim size.

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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08 Aug 2020 09:48
DEET
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1975 Dt 400 crank shim #4

MarkT wrote: Shim is on the primary gear side on the ones I've seen. Often, crank will rub the case if you forget it.
Requires some precision measuring of crank width and distance between bearings to determine shim size.


This is the key.

Formula?
Distance between bearings MINUS crank width =clearance.
Clearance DIVIDED by 2= shim thickness.

Put the shim on the primary gear side of the crank.

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09 Aug 2020 12:49
Bombo
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1975 Dt 400 crank shim #5
Thanks for the advice all, I will take the measurements and head to my local engineering shop to source the shim as there is no shim showing in the Yamaha database in Australia.

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09 Aug 2020 13:13
MarkT
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1975 Dt 400 crank shim #6
It is possible it doesn't require a shim. Hard to tell. I know Yamaha got away from the shims on the later 125's and 175's. (1978 model year in the US)

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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