What is stock sprocket pitch on 2008 FZ1?

Time to change the chain on a 2008 FZ1. Bought the bike used, a year ago. Don't know if the sprockets are stock, 520 or 530 pitch. I have been advised to change sprockets when changing chain. Any advise on 530 pitch or 520 pitch chain and sprockets?
 
Stock was 530, 17/45.

As long as you get a decent chain the 530/520 won't matter, there is a weight difference (520 being smaller) that will lessen rotational losses, but it's pretty negligible.

Rear sprocket can be aluminum or steel, steel will last longer.

I just replaced all of mine with a kit from revzilla, vortex brand 15/45 steel. It is 520, and feels good to ride on.
 
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