-1,0 seems to be a popular (and cheap) 520 choice on ebay for the F3.
I would recommend it personally.

 

I believe stock is 15T front and 43T rear..

Thanks for the link!! Definitely helps!!!

It looks like I may go with -1 front +1 back. Here's a comparison at, what I call, cruising speed.

Stock: 15F 43R 6800 RPM=85.5mph
Custom: 14F 43R 6800 RPM= 79.8mph
Custom2: 14F 44R 6800RPM= 78

So to cruise the same MPH (approximately) I would have to buzz the motor an additional 520 RPM.. I don't think that's all bad what do you guys think? Is it even worth going +1 in the year?

Once again, I appreciate all the replies.. I will definitely go with the 520 conversion.. Thanks for the recommendation on that!!!

 

Well I ended up going with a -1 in the front and stock in the rear.. Bought a kit from Sidewinder Chain & Sprocket.. Can't wait to try the new combination!!! Thanks for all the help!!!!!!

 

im almost positive when i bought mine it was +2 in the rear. because at the time i didnt even know how to ride (i had my friend drive it back from the buyer haha), let alone know anything about how anything worked. but i know that made the speedometer run high, 80-85 on my speedo was actually somewhere around 60. I dont know how easy it is to calibrate it (i just bought a new chain and sprockets), but just some food for thought.

 

Should I buy a stock chain and sprocket for the rear or go aftermarket with vortex? Does it even really matter?

 

Aftermarket is usually cheaper, but whatever you go with, buy a whole set. (Front & rear sprocket & chain)

 

do you have a speedohealer installed?? Because i do, and with a 16/45 at 7k, its 84mph...

 

just do it my way,

-1, +0 sprockets

then do the f4i gauge mod.
+/- 1mph at 100mph.

 

16/45 is on also. i have no adjustment on my healer and it is gps confirmed. i thought i would need adjustment with this gearing, but that wont be required until i put the stock gearing back on it..(f4i already installed)