Engine serial number question

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78XS400 · #1 Unread post by **78XS400** » Wed Sep 12, 2007 5:18 pm

Yo guys, quick question.....

when i bought my 78 xs400, the seller told me that a 1980 engine was put in (he gave me the original 78 engine as well), my question tho, is there a way to make certain its a 1980 engine? That way its ezier to order parts for it. I can see a 10-15 digit number on the engine, im just wondering if yamaha can tell me what year its from.

Any advice guys? thanks alot

Johnj · #2 Unread post by **Johnj** » Thu Sep 13, 2007 2:34 am

Yes they can tell what year the bike or engine is, from the number. My Kawasaki manual has the information in it.

crazypj · #3 Unread post by **crazypj** » Sun Sep 23, 2007 4:25 pm

If you have the original engine, you'll notice the numbers should be the same as the frame/VIN number. Yamaha only stopped using matched pairs a couple of years ago (forget when exactly)
That means the 1980 engine will have 1980 numbers, which means any half decent Yamaha dealer/parts person can tell you exactly what you have
PJ