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Makotosun

Old new guy here-

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Old new guy here- was created by TheWildBill

Hi all- been riding/racing for almost 60 years. Many of these years have had Yamaha enduros,mx, yz's (currently have a couple mx250, mx360, a RT-1/2 and DT-1/2.
I'm looking for compatibility between DT/RT and MX250 and MX360. Do cylinders interchange? Any clutch/gear interchange?

Thanks for any info- Bill
26 Feb 2024 13:12 #1

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Replied by automan on topic Old new guy here-

After 60 yrs. you should know?
26 Feb 2024 13:38 #2

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Replied by Ht1kid on topic Old new guy here-

Greetings from Tennessee. 

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26 Feb 2024 14:54 #3

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Replied by MarkT on topic Old new guy here-

Welcome!

More info on the MX models is necessary.  Yamaha had an engine "redesign" of the Enduro 250 (DT250) and 360 (DT360) in 1974 that was based on the new architecture of the 1973 MX250 and MX360. 

I'm not sure much from a 1973-on MX250 or MX360 engine would be usable on a 1973 or earlier Enduro 250 (DT1/2/3) or 360 (RT1/2/3) respectively.

 
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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26 Feb 2024 16:48 #4

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Replied by TheWildBill on topic Old new guy here-

Thanks for an informative answer..
As I said, I've had these bikes , but never tried swapping parts till recent times. Getting harder finding parts (especially "high-wear" pistons/rings/cylinders).
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26 Feb 2024 18:37 #5

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Replied by RTD2 on topic Old new guy here-

I am working through a few things.  I do not have a single bike from 1972 which I consider to be the missing link on Enduro's/MXs.  I have lots of 1971 and prior CTs, DTs and RTs.  I have a 73 ATMX and two 73 MX360s and a 73 RT3.  There are no engine parts that I can see that will translate between the RT3 and the MX360s.  I will assume the same is true for the DT3/MX250s.  I can pretty much guarantee that there will not be much of anything on the 73 YZs that can be used on the 73 forward Enduros. 

I have lots of 73 and prior rear suspension parts, if you are restoring that is one thing, for anything other than casual riding, in my opinion, they are not very good.

There are lots of fork parts that interchange from 68 through 73; Enduros and MXs.  The wheels also have a lot of interchangibility.  I have measured that 73 MX360 wheels and forks will fit on my 71 through 73 enduros.  The only difference I can see is that the 73 MX360 inner fork tubes are a little longer. The 73 wheels are obviously the Akrondt style raised rims, but they will definitely work on, at least my 71 enduros and MXs.  I have not tried anything from 71 forward on my pre-71 DTs.

I am shadetree mechanic at best, I am happy to answer any questions based on my direct experience, but there are a lot of others here smarted than me.  I completely agree with Mark's comments on the pre-73 stuff.

Mike 
68 DT1, 70 DT1C MX, 70 Husqvarna 250 Cross; 71 CT1C, 71 RT1B, 71 DT1E MX, 73 AT3MX, 73 MX360, 76 Honda Elsinore; 2021 KTM 500 EXC-W; 2001 Honda XR400R; 2007 Harley Davidson Sportster 1200
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26 Feb 2024 20:28 #6

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Replied by TheWildBill on topic Old new guy here-

Thanks Mike-
27 Feb 2024 06:33 #7

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Replied by TheWildBill on topic Old new guy here-

Don't be a dick
28 Feb 2024 10:29 #8

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Replied by RT325 on topic Old new guy here-

Welcome from NZ. The MX250 & 360 were a new design & nothing useful will interchange with the early motors by memory. Piston kit will but that's about all. Good way to check is eyeball the base gaskets on both.
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29 Feb 2024 02:06 #9

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