OzVMX Forum

Clubroom => Tech Talk => Topic started by: motormouse on September 23, 2012, 07:44:51 pm

Title: mx 400 B ?
Post by: motormouse on September 23, 2012, 07:44:51 pm

Looking at what looks like a MX 400 B which the guy is telling me is a rare, limited run of 500cc prototypes made by yamaha. Engine number 574-000323, frame number 509-007392 and 5000 cast in bottom left of barrel.
   Has anyone heard of anything like this or is he full of it. Any info would be much appreciated.
     Thanks Dave.

Title: Re: mx 400 B ?
Post by: brent j on September 23, 2012, 07:52:56 pm

So far it looks like an MX250 frame with a DT400 motor

Title: Re: mx 400 B ?
Post by: Iain Cameron on September 23, 2012, 07:53:17 pm

Can't find a 574 xxxxxxx could it be 57H . according to my knowledge there was no such bike the # 509 is the prefix for the 75 mx250 b . after the sc500 ,the 490's from 82 on were the closest to 500 2strokes made . Iain

Title: Re: mx 400 B ?
Post by: Iain Cameron on September 23, 2012, 07:54:57 pm

bitsa unless its cheep keep away Iain

Title: Re: mx 400 B ?
Post by: motormouse on September 23, 2012, 08:06:32 pm

Thanks for the info guys, he tells a good story. I think he may have forgotten to take his medication this morning!
       Thanks Dave.

Title: Re: mx 400 B ?
Post by: brent j on September 23, 2012, 09:51:11 pm

I seem to remember this same combination being advertised once before, and as a 400B then too.

Title: Re: mx 400 B ?
Post by: tony27 on September 24, 2012, 05:13:08 am

I thought someone bought the thing before finding out it was a bitsa

Title: Re: mx 400 B ?
Post by: motormouse on September 24, 2012, 07:30:38 am

A google search turned up the very same bike. 



             http://www.vintagemx.net/blog/1975-yamaha-mx-500-prototype/

Title: Re: mx 400 B ?
Post by: Slakewell on September 26, 2012, 07:17:15 pm

The MX 400B is half a thing IMO

Title: Re: mx 400 B ?
Post by: IT400C on September 27, 2012, 01:14:24 pm

Quote from: iainyz on September 23, 2012, 07:53:17 pm

Can't find a 574 xxxxxxx could it be 57H . according to my knowledge there was no such bike the # 509 is the prefix for the 75 mx250 b . after the sc500 ,the 490's from 82 on were the closest to 500 2strokes made . Iain

509-007392 would be one of the last 1975 MX250B's manufactured...........
574-000323 would be one of the earlier Australasian 1976 DT400C's...........   

Title: Re: mx 400 B ?
Post by: Iain Cameron on September 27, 2012, 05:47:39 pm

Well one learns something new each day IT400C , I didnt think of the DT . Iain