Other Yamaha frame identification

Hey guys, the other day I found an old Yamaha frame. I have decided that I am going to turn it into something that I can ride. It has no motor. I usually ride 4 strokes, so I may put one in it. The problem is I can not identify what model of motorcycle it is. The frame is stamped 5x6 007173 and it has yellow plastics. I have been searching all over the web with no luck. If you could help me it would be totally great!

Thanks,
Tom
 
The 5x6 seems to id it as a 1982 YZ490

It was not hard to find and I'm sure that it took me a lot less time to find it than you took spamming several sites looking for an answer.

Look here
http://craigmac215.tripod.com/yzmodels.htm

Yep. My 82 490 has the same begining code. But since he came looking here, he gets to see my vintage iron.:banana:
TheDirtShots008.jpg
 
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