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1978 yz250E front fork stanchion tube dimension above top triple clamp

  • Joe1028
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1978 yz250E front fork stanchion tube dimension above top triple clamp was created by Joe1028

Hi,
looked but can not find the stock front fork tube protrusion above the top triple triple clamp and the min and max dimensions... 78 yz250E..
thx, Joe
21 May 2026 21:02 #1

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Replied by MarkT on topic 1978 yz250E front fork stanchion tube dimension above top triple clamp

I'm not 100% sure on the YZ, but on many models of that era with forks that extended through the clamps, Yamaha scribed a line on the fork tubes that lines up with the top of the triple clamp.  

I can't recall ever seeing a "min/max" but there might be one?  I'll look and see if I have a Yamaha Competition Tuning Manual for a 78.  
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
21 May 2026 22:18 #2

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Replied by RT325 on topic 1978 yz250E front fork stanchion tube dimension above top triple clamp

Pretty sure they do have a scribed line to set flush with the top. But it's a bit of personal preference really. But don't go so far through that the wheel might hook the guard on full compression. Good model you have there, that & the 400 in 1978. I got the 400 new one "79, a one year long stroke motor & was my favorite looking back.
The following user(s) Liked this Post: swm
22 May 2026 04:49 #3

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