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  #1  
Old 04-07-2008, 03:02 PM
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Default 89-92 yz125 engine casting ID number??

Hi Everyone, Im new here, this is my first post so here goes. I just bought what the guy told me was a 1989 yz125. He said the piston had been changed last year with a wiseco kit. Whell I tore the bike apart and the piston thats in it is wiseco part#594mo5650 for 90-92. So now what Im faced with is either they put the wrong piston in it but it still runs or maybe the motor or the whole bike is a 90 or newer. I cant find any vin numbers on the frame where there suposed to be. But the number on the motor is 3JD000567. Is there anyone out there that can look this number up and tell me what year it is or maybe point me in the right direction, thanks BeeZnutZ
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Old 04-07-2008, 05:00 PM
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Default Re: 89-92 yz125 engine casting ID number??

I just got done grinding all the old paint off the frame and I now have the vin. the 10th digit on my vin was k so it stands an 89. Now Im wondering if the piston being for a 90-92 is gonna cause an issue.

Last edited by Beeznutz79; 04-07-2008 at 05:10 PM.
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Old 04-07-2008, 07:03 PM
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Default Re: 89-92 yz125 engine casting ID number??

The engine number for a 1989 starts at 3JD-000101. A 1990 starts with 3SR-006101. It looks like your engine is 1989.
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Old 01-18-2010, 08:13 PM
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Default yz 125, year?

i bought a yz 125 from a guy and got another bottum end with it. the question is what year are the motors. the reeds will not inter change. the bike is a 90 but i don't know about the motors, one is a 3xj-008187 and the other is 4ex-012021. help me please i want to order parts but don't know whats what.
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Old 01-19-2010, 06:53 PM
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Default

doylepi, I replied to your other post but here it is again.

Engine and Frame U.S., Canada and Australia:
Year and Model Engine/frame starting number
1991 YZ125B 3XJ-008101
1992 YZ125D 4DB-007101
1993 YZ125E 4EX-010101

This came from my Clymer book for 1988-1993 YZ125-YZ250.
Looks like you have a 1991 and a 1993.
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Old 01-31-2010, 07:07 PM
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Default Bikes Years

Here is a great site to tell what year your bike is by the numbers on the frame and motor.

Yamaha YZ models
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