Hi does anyone know if i can fit a 150/60 ZR17 66w on rear of my fzr 400 instead of 140/60 R18 64w???

No.

You cant put a R17 tyre on a R18 wheel

thought so ;-/ when i got the 400 it came with new tyres 110/70 ZR17 54w & 150/60 ZR17 66w whats on rear now is 140/60 R18 64w which is standard for 1989 1wg i think, cheers

Google tells me,,,,standerd tyres for your bike are

Front,,,,,,120/60 R17

Rear,,,,,,,160/60 R17

So some one put a R18 wheel on the back of your bike. I would keep an eye out for 17 inch rear wheel for you bike.

Google also tells me that the 1WG bike is a 1986 bike

The 1989 bike is 3EN2 model.

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thanks for your help mate, e-bay i goa lookin

frame vin number start 1W6