YZ 250 Engine ID

7

77vettejeff

Member

Apr 1, 2006

9

0

• Dec 8, 2007

• #1

Could someone help me determine the year of a yz250 motor with codes as follows: 5X503 and 1LU-007688???? The guy I bought it from guessed 1985.

 

M

MOgle80

Member

Dec 4, 2005

37

0

• Dec 8, 2007

• #2

The 1LU looks like part numbers for a 1986. where do you find 5X503

 

7

77vettejeff

Member

Apr 1, 2006

9

0

• Dec 8, 2007

• Thread starter
• #3

thanks for the reply. The 5X503 is on the case by the shifter shaft. So this is 1986?

 

M

MOgle80

Member

Dec 4, 2005

37

0

• Dec 12, 2007

• #4

here is a 86 motor. It is not black like usual though it might have the 5x503

 

M

MOgle80

Member

Dec 4, 2005

37

0

• Dec 12, 2007

• #5

you should have numbers on the right side of the intake part of cylinder

 

7

77vettejeff

Member

Apr 1, 2006

9

0

• Dec 12, 2007

• Thread starter
• #6

thanks MO, It looks like the one in the photo. The numbers on my cylinder are: 1LU 246CM3 Y-1. What are the number on your 86?

 

M

MOgle80

Member

Dec 4, 2005

37

0

• Dec 13, 2007

• #7

I dont own a 1986 but I can tell you the important number is the 1LU and 246 cm3 is the engine size (cubic centimeters)....The picture came from bikepics.com

 

7

77vettejeff

Member

Apr 1, 2006

9

0

• Dec 14, 2007

• Thread starter
• #8

thanks, I found this. take a look
http://www.dropbears.com/m/models/yamaha/modelcodes.htm