Does anyone know of a site to decode engine serial numbers for yamaha motorcycles?
A friend of mine just bought a 4 wheeler that someone put an inline 4 cylinder yamaha motorcycle engine in. He believes it is 750cc but wants to find out exactly what it is in order to purchase parts.

• Yamaha Engine Serial Number Identification
• Yamaha Motorcycle Engine Serial Number Lookup | Reviewmotors.co
• Yamaha Serial Number Lookup

Any help is appreciated.

Yamaha outboards manufactured between 1984-2004: you must first locate the Model Number located on a label on the outboard’s transom bracket. The top number is the model number. What you are looking for is the last letter in that model number. Decoding your Yamaha VIN number: 1. Find the VIN on your motorcycle. If you have a traditional motorcycle, it will be on the right side of the steering stem, just below the handlebars. If you have a scooter, check the stem. If it’s not there, it will be on a metal plate affixed to the frame. Make sure none of the digits are missing from the VIN. Motorcycle VIN numbers give a world of information if you know the decoding secrets. While they may seem like random strings of characters, VIN codes reveal the motorcycle's manufacturer, its model, engine size and other characteristics, where the motorcycle was manufactured (both country and plant), as well as the year it rolled off the assembly line. Yamaha Starting Frame VIN Number and Engine Serial Numbers. Below is a lookup table to identify the make model and year of your Yamaha ATV. This data covers all ATV models from 1980 to 1997. Yamaha Starting Frame VIN Number and Engine Serial Numbers. Below is a lookup table to identify the make model and year of your Yamaha ATV. This data covers all ATV models from 1980 to 1997.

Thanks...

Try this one...

Thanks. Do you know if there's a section on there to plug in just the engine serial number and find what bikethe motor came from?
The engine serial # is
2AX-000208

send a pm to bignumber1 or jamahadim on here
there both yamaha dealers and should be able to help
all the decoders i find you need the whole vin

I'm not certain you can 'decode' motorcycleengine serial numbers, only the VIN. It's possible that this information could have recently changed making it available, but not to my knowledge (or lack thereof). I'll be interested in learning if this has changed.

Motorcycles are just like cars! The vin# match. but this one looks like a pre 80's before they started using 17 digit vin#. I already tried to help this one, as he posted it elsewhere on this forum under the name QUAD750. the method of decoading that I gave him only works on 17 digit vin's.

The first three digits in a yamaha part code represent the model and will match the first 3 in a pre 1981 VIN. From what I can tell that's not a motorcycle engine.

After 1981 Yamaha went with the long VIN still common today. The model code wasn't always clearly represented in the VIN but they continued along that theme for most of the part numbers. ITSdarted becoming more difficult to separate them when Yamaha started producing multi fit parts. Say a fuel cap for an 1100 V* fitting the 650 and other models.

That engine code however is specific to a pre 1981 yamaha. The only problem is that the 2AX code doesn't show anywhere in the parts fiche's I can find online. That doesn't mean it's not there, just not in the street bike databases I can find. Stop buy you local dealer with that engine code and they should be able to help you out.

I called Yamaha and they were unable to find that engine number in their data base. It is an older number. Sorry.

Bummer ! I love all the info about where to check it out but my problem is a little different . My bike was part of a pair of bikes in pieces that the previous owner threw back together. My frame and engine may not match . My problem is I cannot find where the engine or frame numbers are located. Anyone ? Please help a brother out

Can you post a couple pictures of the engine?

Soon as I take some and figure out how to post them Bubba .Thanks I appreciate the quick reply

OK I have been doing some research and found out a few things . MY bike was repainted blue,its original color was a metallic yellow orange .It has drum brakes front and back My most educated guess is a 71 XS B1 . Any thoughts ? I read that were only about 10.000 or so made

Yamaha Engine Serial Number Identification

Yamaha Motorcycle Engine Serial Number Lookup | Reviewmotors.co

Yamaha Serial Number Lookup