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**Copytech** · 01-19-2007, 08:36 PM

Originally Posted by Dirk

Yes i see it

JR you are right

The F3 frontend and calipers need breakdiscs with a 296mm diameter ( sorry , i dont know it in inch ) and the F3 discs are with floaters.

You can use a F2 (PC25) , VFR750 (RC36) or a CB750 (RC42) wheel with RC36 / RC42 discs without floaters , also with a 296mm diameter.

the F2 disks have only a 276mm diameter

from this post http://www.hawkgtforum.com/viewtopic.php?t=815

Yes I know you started that thread, but all the info you are asking seems to be in there.

JR · 01-20-2007, 04:19 AM

Quote

"Many listers change to a complete F2 or F3 front end, which gets you dual discs (276mm rotors with 2 piston calipers for the F2, and 296mm semi-floating rotors with 2 piston calipers for the F3). This coincidentally get you a 3.5" wide front wheel as well".

"A common modification is to fit the complete front end from a CBR600F2/F3. Once you have the parts, fitting one is a simple bolt-on operation, as many of the parts are similar (even identical) between the two bikes. This gives you very good dual-disc brakes; a 3.5-inch front wheel; and, if you use a '94 or later fork, an excellent cartridge fork. This is a wonderful modification to make, as the brakes are excellent (far better than the Hawk units) and modern radial tires will transform the bike. The damping rates on the '91-'93 (pre-cartridge) forks are the same as those on the stock Hawk forks.

The parts you need to make the swap are the complete fork tube/slider assemblies; the complete braking system, including the master cylinder (actually, the Hawk master cylinder will work, and gives you a right-hand mirror mount) and rotors; the front wheel; and the right-hand wheel spacer. The Hawk triple clamps, axle, speedo drive, handlebars, controls, etc, may be retained, although if you use the Hawk bars instead of the F2 bars, you'll need to make up some custom brake lines, as the F2 lines are too short. Indeed, you'll want to keep the stock Hawk triple clamps, since they provide a place to mount the instruments.

Note that you if you fit an F3 fork, you'll lose the speedometer. The F3 has an electric speedo driven off the countershaft. The Hawk speedo drive won't fit on the F3 fork, as the F3 wheel's hub is too wide (and doesn't have a fitting for the speedo drive, anyway). For a streetbike, a '94 F2 fork is a much better bet.

btw, Race Tech emulators for the Hawk drop in to the '91-'93 F2 forks, and Hawk damper rods and springs will fit in there, as well. Near as I can tell, the only difference between the Hawk and the early F2 forks are caliper mounting lugs on the sliders."

I'm guessing again but:-
If you use the F3 forks/calipers you'll need to use a 296mm disc (F3 has this) but no speedo. Remember the F2 wheel has a spacer on one side of the wheel and the speedo drive on the other acting as a spacer so trying to fit an F2 wheel in F3 forks you may need to look at the spacing.
Plus the disc has got to have the same bolt pattern!!!!!!!

**bradrenea** · 01-20-2007, 06:07 AM

So how can I tell if I have early or late F2 forks? They were on the bike when I got it so I am not real sure what they are.

JR · 01-20-2007, 06:44 AM

I was told that 91-93 F2 has fork internals like the Hawk but with pre load caps (large slotted adjustment), but the 94 F2 has "cartridge" type internals and preload & rebound adjustment (small brass slotted adjuster)

Honda Archives - Motorcycle.com

http://www.motorcycle.com/mo/mchonda/nfork.jpg

**bradrenea** · 01-20-2007, 09:49 AM

Thanks for the info. I guess that means I have the later forks.

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