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yamaha part number?

Only if they match exactly. Some parts with different numbers interchange, but I'd say most don't.

As gray stated, sometimes a part will fit but the end result will be quite different. Yamaha often uses the last series of numbers and letters for many years, but it's the first 3 letter/number that decides everything.

Every Yamaha part is a 12 digit number or number/alpha combination. The first 3 digits/letters determine the original model that part was used on. Any other model that uses the exact part will have exactly the same number. The next 5 digits identfy which part it actually is (I.E., an 11631 is ALWAYS a standard bore piston, 11635 is always a 1st oversize, etc) the next 2 digits will reflect a part that has had a production change, but not enough to warrant an entire new number. (01, 02, etc)The next 2 digits usually indicate paint color, or finish. As an example part number 214-11651-01-00: first 3 digits indicate model first designed for, in this case, a 1968 DT1 250 Enduro. The next 5 digits indicate it is a connecting rod (crankshaft) The next 2 digits (01) indicate it has been changed 1 time. (In this case, extra holes were added on the big end for better lubrication) the final 2 digits (00) indicate no particular finish detail (paint, chrome, etc). This same part had additional slots machined (again, for better oiling) and was used in the 1974 YZ 250/360A, and the number changed to: 431-11651-00-00. While the part would still fit and work (mo'better) in the original machine, it warranted a different 1st 3 digits. This is often true with tranny parts as well. Simply because the first 3 digits of the parts are different between a YZ 450 and a WR 450, as an example, doesn't mean they won't interchange (as a set, of course) between the 2 models. As Mr. Know-it-All used to say, "Surely, you should have known"....ride:

To clarify that, Yamaha uses a "basic number" parts system like Ford and Honda do. The syntax is: *model prefix-basic part number-suffix a-suffix b*

- The model designator indicates the model for which the part was first issued. It does not limit the part to one model, as there are any number of parts that fit a number of similar models, like wheel hubs, for instance.
- The basic number tells you what the part is. An 11400 is a crankshaft, a 21101 is a frame.
- The suffixes are used to note alternate sizes, revisions in some detail, etc., and have no single distinct meaning in and of themselves

For example, 5JG-11651-00-00 is a connecting rod for an '01 YZ426, and 5BE-11651-00-00 is a rod for a '99 YZ400. The numbers look quite similar, yet the parts won't interchange without changing other parts to fit. A 5UL-11651-00-00 is also a connecting rod, as are all 11651's, but it's for a YZ250F, and I'm pretty sure it won't fit either.

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Hi is there a way to tell by the part #'s what parts interchange with each other on a yz400 and 426? thanks