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73 125 mx cylinder identification

  • zestycj7
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73 125 mx cylinder identification was created by zestycj7

Hey everyone. I just picked up a 73 125 mx and need some help indentifing the cylinder that is on it.I was told the enduro cylinders have no part number and the mx does,
26 Jan 2023 12:10 #1

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Replied by MarkT on topic 73 125 mx cylinder identification

What numbers did you find?

If I remember correctly both Enduro and MX reed cylinders have displacement (123cc) cast in on lower edge by transfers and I think both have a "code" cast in someplace... lower edge again or often around the intake area... that identifies the model.

Maybe something like 318 or 31800?
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 Jan 2023 13:46 #2

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Replied by Ht1kid on topic 73 125 mx cylinder identification

Greetings from Tennessee. 

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26 Jan 2023 15:56 #3

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Replied by RTD2 on topic 73 125 mx cylinder identification

I have a NOS MX Cylinder on my 73 125 MX, I will go check.

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
26 Jan 2023 17:06 #4

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Replied by RTD2 on topic 73 125 mx cylinder identification

I see nothing stamped on the cylinder except 123cc.  I will try to dig out my original cylinder and see if there is anything visible on that.  

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
The following user(s) Liked this Post: MarkT
26 Jan 2023 17:16 #5

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Replied by MarkT on topic 73 125 mx cylinder identification

It's possible there are no markings... not sure exactly when Yamaha started adding model numbers to casting.
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
26 Jan 2023 18:46 #6

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Replied by RTD2 on topic 73 125 mx cylinder identification

Mark, I will dig out the original cylinder tomorrow and look. It is so damn cold here right now, that I didn't want to dig into my parts tonight. I will turn on the heater in my shop tomorrow morning and look. I will have a definitive answer, the cylinder I took off was the original.

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
The following user(s) Liked this Post: Sneezles61
26 Jan 2023 19:01 #7

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Replied by RTD2 on topic 73 125 mx cylinder identification

All, I dug out the original cylinder from my 73 AT3MX and the only stamping is the 123cc on the base. It does have a huge intake port BTW!

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
The following user(s) Liked this Post: MarkT, Ht1kid, Sneezles61
27 Jan 2023 10:01 #8

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