that is a 1981 yz60h.
1981 SR185
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
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.
You find the engine size in the name 1993 Yamaha wave runner model WR500, WR500 being the engine size.
-365- IS 1973 Yamaha MX360. First 3 numbers tell me that, for example similar models of that time; the SC500 is 363 AND the MX250 is 364.
Use NGK MOdel # d7ea WITH A GAP SIZE OF 0.028
g103e-00428
No there different sizes and different shapes depinding on the make and model
43mm stock. There was a size increase in the 1993 Model year.
On American database carfax as J=Japan, Y=Yamaha, A=Motorcycle, 10th Digit B=1981. Speak to a Yamaha main dealership they are most helpful and will do the full decode for free. Possibly a Maxim 700 cruiser? PLEASE CHECK THE DISCUSSIONS
The 1UJ00 (4th to 7th characters) are the model. Ingore the zero's in this case, yours (1UJ) is a YX600. The 10th character is the year, G=1986. For more information follow the link.
Model Year Size cc Description Type Code V.I.N. DT2MX 1972 250 DT2MX DualPurpose DT1 DT1F-185101