Standard sprocket size = 45 rear.
 

Did you know, the standard sprocket size on the rear of my 06 600f is a 45 tooth?

I checked the bike and I checked on supersprox UK site and its true... its a 45.

SUPERSPROX UK- Honda - Road Bikes - 600-649 ccm - CBR - CBR 600 F-2, 3,4,5,6,7 [2002-2007]

I never knew... Im now thinking about re gearing for 47 tooth..

Will changing from 45 to 47 make much difference on the speedo?

Cheers
Tom.

One of the most common upgrades for the f4i is a -1 front +2 rear. This is what I have done as well and my speedo is about 15-20mph off, I have also read however that it is an easy fix with a speedohealer. I couldnt tell you what the difference is with just a +2, im sure somebody else will chime in.

Yes we knew, its because you have a euro non sport model. In the US we only got the sport model [even the 04-06 banana seats here have the sport model's cams, clutch and rear sprocket] so 46 is stock for us.

Get a speedo healer and you can change the gearing to whatever you want and stay calibrated.

U.S.-
F4 = 45
F4i = 46