PW50 or PW80???

[azazel_18_2]

I bought a little bike for my kids. All it says is Yamaha and PW. Engine burnt up due to faulty oil pump. I am looking at a new cylinder, piston, rings, gaskets and bearings. I just need to know how to figure out if it is a PW50 or PW80. My guess is PW50 because it says 49CM on the side of the cylinder. HELP!!!

 

[FruDaddy]

Is the oil tank under the seat or behind the front number plate? The 50 has it behind the plate. Also, the PW 80 is chain drive while the 50 has a shaft. Another easy visual check, the PW80 has wire spokes and a 12 inch rear tire. If you are still unsure, go to the Yamaha website and take a look at the pictures of the PW50, they have changed very little since the beginning of time, and they barely even resemble the 80.

 

[azazel_18_2]

I got it figured out. It is a 50. Oil tank is up front. 10" wheels. My question is why bore the cylinder? New cylinder is $95 and top end kit std is $60 as where having it bored is $85 and a .020 top end kit is about $100!!