Yamaha 90hp 2 stroke.model 90AE10. serial number 502403.What year is it

SOURCE: What year model?

Call a yamaha dealer, ask for the service department. They will be able to tell you the model year.

SOURCE: i bought dirt bike for husband! is 2005 yamaha

Congrats on the purchase! easy way to tell look at the exhaust pipe. if it is just a thin tube that is tight to the engine and goes right to the muffler it is a 4 stroke (250f). the four strokes have a square-ish head. Deep/bass-y engine sound. If you have a large (probably black) exhaust pipe with a large bulge in it (5-6" diameter) that wraps around the front of the frame, its a 2-stroke. They have a more round cylinder head. Beautiful pingy sound and a little smokey at start up. DON'T FORGET TO MIX YOUR GAS!!! there should be a serial number sticker at the very front of the frame (behind the number plate where your triple clamp/handlebars connect) Probably on the left side. Hope it helps! rate please :)

SOURCE: what is the maximum rpm for 50 yamaha 2 stroke

max operating rpm 4500-5500 see www.broadwaterboating.com.au/outboards/335_Yamaha_50hp_Mid_Range_2-Stroke.php for complete specifications. Hope this helps

SOURCE: serial number problems 1t0-003815

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.

Cheers.

http://www.johnnystoybox.com/yamaha_parts_cross-reference.htm

http://www.boats.net/parts/search/Yamaha/Motorcycle/1992/YZ80D/parts.html

http://www.motoverse.com/tools/vin/yamaha.asp

SOURCE: what year is my breitling navitimer model number 806 serial number 1011422

1965 theres a full breitling serial number list at http://www.brittons-watches.co.uk/watches_breitling_dates.htm