Anyone have advice on whether I should be changing up the rear (and by how many teeth) or lowering the front sprocket as the not getting much chance to hit top speed in HK - speed limit on the motorway/highway is a pathetic 100kph (60 for gods sake!!) cheers

 

The F4i stock is 16/46. A 15/46 conversion is the most popular.Gives you more low end torque and your top end isnt' effected that much.

 

There's plenty of posts already onsprocket changes, but....

F4i stock, as mentioned above, is 16/46 (although I've seen sites stating 15/46 as stock so it may vary according to the year of the bike). Most people seem to prefer 1 down on the front, and 2 up on the rear. I'm planning to do just the 2 up on the year (i.e. 16/48).Your speedo reading will be affected though.

 

I went -1 in tha front and love the torq. Not much top end loss either.

 

So to get this straight...i can go -1 in the front using the stock chain and rear sprocket correct as long as the new front sprocket is a 525?

 

Used to go 3 up at the rear on my Hornet6 so next C&S will be 1 down 2 up - cheers

 

Thats what I did the new front sproket was around $13 from the dealer.