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Help me identify this bike


kaneys
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My name is mark and I live in australia.. I have a Yamaha motorcross bike that has belonged to my wife for about 10years. We dont really know what it is.

At first glance it looks like a DT400 engine in a MX250B frame, but the guys at Yamaha had it for a couple of weeks and said there have been Modifications

Frame # 509-007392

Engine # 574-000323

there is a 50000 stamped under the head fins

From what I can see the 574- engine number is not a dt400 number at all

Any assisttance you can give us would be greatly appreciated

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thank you dont get me wrong I have been onto this for a long time. I appreciate any help I can get and pretty much everyone starts where you did so your not wrong in that regard. One other guy told me it was a yz250c competition bike but on further investigation that was proven wrong as well.. I have been told there was a mx500 prototype made in 73 that did not go into production but cant get anyone with info on that bike.. thankyou anyway

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Could it be an import?

A picture would be usefull.

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Heres a start, it's all out there, its just a case of taking 5 minutes looking.

509ao.jpg

574p.jpg

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I have the codes on pdf, but if you go to http://www.cmsnl.com/yamaha-model-code-reference-1961-1989_model11319/partslist/ should help

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ahh so i was right then!!!

WHAT?!?! How could this happen?? Paul right about something? What is happening to my normal sane world?? Somebody slap me, I gotta wake up!!!
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Ok I get it haha.. So you have one item with those numbers.. lets just as suggested earlier, google dt400c serial numbers

http://www.merrittmotorcyclesalvage.com/yamahaidentification.htm

http://cyclerestorer.com/pages/show_man_serial_num.php?sort_field=4&manufacturer=Yamaha

http://www.dirtrider.net/forums3/showthread.php?t=157610&conly=

http://dirtbike.off-road.com/dirtbike/review/yamaha-vintage-dirt-bike-id-guide-21792.html

Well thats a few that came up straight away, so I hate to say it is yours wrong or all these????

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