That would be a YZ250E 1993 cheers, bronmoto
vr6-01372 what year and engine size
Look at where the cylinder meets the crankcase. Somewhere on there it should say how many cc's. Round up to an even number and that is the size.
The name of the quad will have a number after the model, like Yamaha Raptor 700. The number means the cc is around that number
Model Year Size cc Description Type Code V.I.N. DT2MX 1972 250 DT2MX DualPurpose DT1 DT1F-185101
that is a 1981 yz60h.
g103e-00428
1981 SR185
Tjhe 4BE prefix suggests a Yamaha 225DT from 1992.
You cannot always identify a pocket watch size by it's serial number but you can by measuring it. See this web site for inches to size designation.
OD281588
The Yamaha with the VIN prefix code 3f9 is a 1980 Yamaha XS400SG. Yamaha made the XS400 from 1977 to 1982. It has a top speed of 109 miles per hour.
ubota L200 engine size Z1100 serial number-18042