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

574 is DT400C mark

509 is YZ250B 1975

Try googling them

574 is DT400C mark

509 is YZ250B 1975

Try googling them

I did already obviously DT400C is 501-.. and yz250B is 483-000101 - 002759. Ive been through all of this on multiple sites.. I have googled the shit out of this

thats how I saw it anyway

when I suggested you google it...I hadnt but upon your curt reply I did, cant be bothered to look at the other one but

http://www.ebay.com/sch/sis.html?_nkw=1976%20Yamaha%20YZ250C%20OIL%20DIPSTICK%20YZ%20250%20control%20dip%20stick%20model%20509%20&_itemId=270895655898

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

Thats better

so continuing with the google thing...does your bike not look like the one here?

http://www.mccookracing.com/articles/charlieOxford_OldMotorcycle.htm

thats how I saw it anyway

when I suggested you google it...I hadnt but upon your curt reply I did, cant be bothered to look at the other one but

http://www.ebay.com/...Id=270895655898

CURT??.. sorry I thought the "try googling it (winky face)" was a little curt.. but obviously mistaken sorry again

Thats better

so continuing with the google thing...does your bike not look like the one here?

http://www.mccookrac...dMotorcycle.htm

Similar frame with no tank strap mount and a little different design behind the headstem

Here is a list of serial numbers

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

for yamaha motorcycles

Maybe you were thinking of the yz250c that starts with 509-100101 to 509-103405. but our number is prior to that

Thanks

Could it be an import?

A picture would be usefull.

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

thanks for that Nev.. where did you get these because everywhere else says different for DT400c 501-200101--211470, so now im confused

Sorry Nev but it looks like most of the numbers on the second list are different to all the other reference sites Ive looked at

How do I upload pics

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

ahh so i was right then!!!

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!!!

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????

Just what is your problem?

you came on here asking for help with id

I offered some help, you responded by just how wrong I was

someone else comes on and offers the same result and it's thanks matey where did you get that info from

WTF as they say