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    need help: Front end

    ok,
    so i tried to figure this out a bunch of times already but can't seem to get a definite answer as I have no prior experience with Hawks or modern machines in general.
    I have F3 front suspension and calipers. I have an F2 front wheel.

    I need rotors... Will F2 rotors work with the F3 calipers? I mean will they mount right with the F3 calipers? The PO told me I would need vfr750 rotors from 90-93...
    Is this true? Should I just get an F3 front wheel and call it a day? Will the Hawk speedo work with an F3 front end if I go with all F3 stuff up front? Should I just trash this perfectly beautiful Hawk speedo for an electronic bicycle style speedo?

    Please help a rookie out.... Cheapest way out would be best, although I do plan on getting some nice new rotors. Info on fully floaters, anyone?
    ride Red.

    #2
    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.

    Comment


      #3
      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!!!!!!!
      "Life may begin at 40, but it doesn't get real interesting until about 150."

      • '88 in Candy Flair Blue + '90 in Italian Red
      • Ohlins Rear Shock
      • F2 front wheel
      • VFR750 rear wheel
      • Hiperform seat&headers
      • MSMotorsport Seat Cowl
      • Steve Lenac Tokico six pot caliper

      Comment


        #4
        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.

        Comment


          #5
          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)
          http://www.motorcycle.com/mo/mchonda/nfork.jpg
          "Life may begin at 40, but it doesn't get real interesting until about 150."

          • '88 in Candy Flair Blue + '90 in Italian Red
          • Ohlins Rear Shock
          • F2 front wheel
          • VFR750 rear wheel
          • Hiperform seat&headers
          • MSMotorsport Seat Cowl
          • Steve Lenac Tokico six pot caliper

          Comment


            #6
            Thanks for the info. I guess that means I have the later forks.

            Comment

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