So Nev your saying that the the DT400C model is 475 but the engine serial number could start with 401-XXXXXXX.
If this is so please look at my original post.
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
Based on the above why would you be focussing on the model code at all if it has nothing to do with what I asked..... Gees.. talk about not being helpfull
More rudeness
Personaly I think someone needs to sit on the naughty step, until they come up with an apology.
Personaly I think someone need to sit on the STOP POSTING step, if your want to keep going on about some model code.
No apology coming from me mate, stop holding your breathe you with pass out..