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The serial number on the engine is totally different from the VIN
number on the frame. If you had the VIN number from the frame, I could give you all the details.
The only info you can get from your engine number
is the production date and origin of manufacture. You can call the Yamaha Motorcycle Corporation for this info.
Call your dealer with the first five figures in the number (3J5-00...,4XJ-01...,275-02...,etc) The dealer can look up on a microfiche exactly what year and model you have.Make sure the engine and frame numbers are the same(Yamaha does this) or you may have a motor from a different year.
It is a YZ80D 1977...first link below is a Yamaha VIN cross reference if you want to verify. (a lot of scrolling)
As your VIN is only 9 digits, this indicates a pre 1982, when a universal 13 digit VIN was adopted, then soon after our current 17 digit VIN.
(please note: I'm assuming the VIN is from the plate on frame and not the crankcase serial number as engines are easily swapped)
Second link appeared amongst a search and indicates a 1992 model. This may be the basis of the problem your encountering.
Third link is a Yamaha decoder I've used successfully (17#) try it or check the Yamaha Corp. link therein.
hello, go to yamaha.com, or they have a forum that you can go to and post your question you will get a responce pretty quick, you need to find serial number on the frame, most motorcycles are on the neck of the frame, atvs usually on the side of frame ,in front of left foot below the bottom of frame, get your serial no. and put them in, and yamaha .com will get answer pretty quick
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