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  1. #1
    Member Oakley_burn's Avatar
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    It's Alive! My CBR600RR Tail Project Lives!

    Hello all!

    Well it's been a year and the last time i posted i said i would be going through a CBR600RR tail end conversion.

    It is now finished and the outcome is really spectacular. Thanks go to SC33 for the initial framing of the idea.

    As the old posting describes, the idea was to put a CBR600RR tail cowl on a VFR. On further consultation with SC33 the VFR was found to be a '94 model.

    This posed a potential problem, my VFR is a '88! Would the modification work on an older model?

    After purchasing a CBR600RR 2003/2004 sub-frame off ebay for 75 (inc p+p, and all brackets attached!) and a cracked cowl that i plastic welded (10 also on ebay) it came to the strip down of my VFR.

    I completely disassembled the rear end, even removing the old sub-frame as the CBR cowl was in no way going to fit. I offered up the CBR sub-frame to the bike and immediately knew that a something a bit special would be required.

    On the later versions of the VFR, the sub-frame attachment points are further up along the main frame. On my VFR, the sub-frame attaches at the first foot peg bolt and on the frame underneath the tank.

    I would have to design a new sub-frame attachment, and completely redesign the layout of the undertray.

    I used the top arms of the VFR sub-frame with some brackets made from steel and then welded them to the arms for the top CBR sub-frame attachment bolt hole.

    Top Bar 1.jpg

    Top Bar 2.jpg

    Top Bar 3.jpg

    I used washers to pack out the gap and some high tensile strength bolts to attach the CBR sub-frame.

    The bottom attachment point was going to be a bit tricky. I needed a way of bolting the sub-frame in place without compromising the geometric lock of the turning force about the top sub-frame bolt.

    So i made two full cross-members out of plate steel and welded each side together. Some paint and i was ready to fit the sub-frame.

    Crossmembers.jpg

    Sub-frame 1.jpg

    Sub-frame 2.jpg

    Sub-frame 3.jpg

    With the sub-frame now fitted and all bolted in, i set about the job of making the undertray of the CBR fit the VFR and all the VFR components (battery, flasher relay, r/r, radiator overflow, No 1+3 coils, fuel pump, main electrical loom, cdi) fit into the CBR undertray.

    With a bit of relocation of some components and some splicing of some wires, everything was now in it's new place.

    The last problem were the closing panels that sit underneath the fuel tank. The VFR ones would not fit completely and neither would the CBR ones. So i again used both and fabricated a closing panel from both.

    Final 1.jpg

    Final 2.jpg

    The project now complete, the bike fired up (eventually! It had been sat outside for 4 months) and all electrical connections tested. Amazingly, after all that i had been through, the only thing that was wrong was that the left and right rear indicators flashed the wrong way.

    It's Alive!!!

    Final 3.jpg

    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  2. #2
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    Crazy, Baby. I'll bet it feels pretty good to have her up and running finally.
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  3. #3
    Senior Member fatso1277's Avatar
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    that looks wonderful....good job.

  4. #4
    Senior Member Hotbrakes's Avatar
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    Sweet, but you forgot the exhaust.
    Responsibly Irresponsible


  5. #5
    Uber Guru Joey_Dude's Avatar
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    Wow good job! Unlike other mods I've seen this looks like it was meant to be like that instead of some brain fart afterthought. You should look at getting into the bodywork business!

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    Oakley_burn (06-17-2008)

  7. #6
    Member Oakley_burn's Avatar
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    Thanks for the complements guys.

    As for the exhaust... i already have a pro-arm off a '94 which bolts straight onto the bike and once thats done then ill start fabrication for the underseat exhaust system.

    Ill be posting more pics tomorrow to show the tank rear mounting, wiring and lower crossmember.
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  8. The Following User Says Thank You to Oakley_burn For This Useful Post:

    fatso1277 (06-18-2008)

  9. #7
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    douglasthecook's Avatar
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    Nice work!!!!! I'm in the process of sourcing the required parts from an RC-51 SP-2 tail section to attempt grafting it on to my VFR. We'll see how it goes, I can only hope it looks close to yours, as yours looks really good!!!

  10. #8
    Member Oakley_burn's Avatar
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    Well as promised here are the pictures of the crossmember in place and the rear tank mounting plate.

    I've also taken a pic of the bracket that i made to mount the exhaust to the rearset.

    Crossmember.jpg

    Crossmember 1.jpg

    Exhaust hanger.jpg

    Tank mount.jpg

    All the manufactured parts are either made from S527 Steel (rust free) or T60 Titanium.

    Note the mounting of the rear caliper reservoir on the r/h rearset in the pic of the r/h crossmember. There is a hole on the sub-frame that is threaded for a bolt and bracket arrangement but it requires moving the pipe feeding the oil to the master cylinder.
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  11. #9
    Member Oakley_burn's Avatar
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    You can also see the new mounting position for the regulator/rectifier in the top pic just above the chain guard, again another manufactured bracket.
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  12. The Following User Says Thank You to Oakley_burn For This Useful Post:

    fatso1277 (06-18-2008)

  13. #10
    Senior Member fatso1277's Avatar
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    dude thanks again man that really gives the vfr a new look. You are the man for this mod. any other mods you got planned.

  14. #11
    Member Oakley_burn's Avatar
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    As i said earlier in the post, i've got a '94 single-sided swing arm to go onto my '88, and then an underseat exhaust.

    I've been looking through the posts, you are doing a F2 front end swap, i was thinking of doing a F3 front end conversion but haven't looked too much into it yet.

    What are your ideas?
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  15. #12
    Senior Member fatso1277's Avatar
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    Quote Originally Posted by Oakley_burn View Post
    As i said earlier in the post, i've got a '94 single-sided swing arm to go onto my '88, and then an underseat exhaust.

    I've been looking through the posts, you are doing a F2 front end swap, i was thinking of doing a F3 front end conversion but haven't looked too much into it yet.

    What are your ideas?
    Yeah i am doing the F2 swap. The F3 would be pretty much the same process. from the various post i have read on here and a few other sites, the 91-93 forks are dampening rod technology(old), 94 are cartridge technology(new), so they are better..but with racetech emulators they should be about the same. The speedo drive for 91-94 f2 will fit vfr directly, the f3 doesnt have a speedo drive but they have gizmos out there that u can use to clock speed.

  16. #13
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    would it be possible to use the cbr tail section and use the vfr subframe? cut n weld?

    Torque=Happiness

  17. #14
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    you should weld those brakets you made and send em to me haha

    Torque=Happiness

  18. #15
    Senior Member fatso1277's Avatar
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    Quote Originally Posted by mpadgett88 View Post
    would it be possible to use the cbr tail section and use the vfr subframe? cut n weld?
    Yeah you could do that, you can just get a picture of the cbr600rr tail and cut and weld it to the original subframe to mimic the cbr600rr subframe. but it might be easier to just go the route Oakley_Burn did. The hard part is just finding places to relocate parts. i got the subframe and undertail for the cbr600rr and it is a lot easier to do mode. i would say just be REAL meticulous when it comes to setting up subframe so it looks for "professional", i wasnt and i have to do a lot of fiberglass work.

  19. #16
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    Im still trying to figure out where he bolted up the bottom of the subframe cant see it in the pics

    Torque=Happiness

  20. #17
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    Looks great! Now you just gotta wash it

  21. #18
    Senior Member fatso1277's Avatar
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    [QUOTE=mpadgett88;386167]Im still trying to figure out where he bolted up the bottom of the subframe cant see it in the pics[/QUOT

    in the stock location for the vfr subframe, right behind the rearset. the angle is changed to mate up with the cbr600rr subframe.

  22. #19
    Senior Member artee's Avatar
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    You should post this story on here.
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  23. #20
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    So the sub frame does match up with the bottom holes?

    Torque=Happiness

  24. #21
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    Nvm i see it now. I what's the specs on the welded piece?
    How you do yours fatso

    Torque=Happiness

  25. #22
    Senior Member fatso1277's Avatar
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    Quote Originally Posted by mpadgett88 View Post
    Nvm i see it now. I what's the specs on the welded piece?
    How you do yours fatso
    pretty much the same as oakley burns. except i used the vfr subframe versus the flat bar he used. i did use the thicker flat bar and an 18mm wrench to make the eyelets.

    1) cut the upper vfr subframe right before rear tank mount. (in retrospect shoulda been AFTER rear tank mount.) put the made eyelets into the tube of the upper vfr rail and bolted it so i could have it welded later. and then mate it to upper cbr subframe and vfr rails. put the tank on and leveled the top of tank with the top of cbr rear fairing with pinion seat on. (i raised mines a little higher cause that how i liked it but it did effect how the cbr600rr side panels fit. hinsight is 20/20).

    2) then cut the lower angled rails of the vfr subframe and LOOSELY bolted them to frame right behind rearset how they go...and angled them to mate up with lower cbr subframe. made sure to insert the eyelets. so i could get the right angle and chopped them down until i got the right length and bolted everything up.

    3) then used 3/4 inch sqaure tubing to make crossmember...and tack welded them.


    then took to pro welder and had them welded up

    spray painted and then had to figure out a new home for the various parts. i dont have any pics of the process but i can definitely walk you thru the steps best as possible...also might work a lot easier if u have a welder

  26. #23
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    Quote Originally Posted by fatso1277 View Post
    pretty much the same as oakley burns. except i used the vfr subframe versus the flat bar he used. i did use the thicker flat bar and an 18mm wrench to make the eyelets.

    1) cut the upper vfr subframe right before rear tank mount. (in retrospect shoulda been AFTER rear tank mount.) put the made eyelets into the tube of the upper vfr rail and bolted it so i could have it welded later. and then mate it to upper cbr subframe and vfr rails. put the tank on and leveled the top of tank with the top of cbr rear fairing with pinion seat on. (i raised mines a little higher cause that how i liked it but it did effect how the cbr600rr side panels fit. hinsight is 20/20).

    2) then cut the lower angled rails of the vfr subframe and LOOSELY bolted them to frame right behind rearset how they go...and angled them to mate up with lower cbr subframe. made sure to insert the eyelets. so i could get the right angle and chopped them down until i got the right length and bolted everything up.

    3) then used 3/4 inch sqaure tubing to make crossmember...and tack welded them.


    then took to pro welder and had them welded up

    spray painted and then had to figure out a new home for the various parts. i dont have any pics of the process but i can definitely walk you thru the steps best as possible...also might work a lot easier if u have a welder

    awesome. I cant wait to get this done. need to locate the plastics first. and a welder lol

    Torque=Happiness

  27. #24
    Member Oakley_burn's Avatar
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    Glad this thread has provided some joy for others. I did this to start with coz i didn't like the rear end of the '88 - too boxy for my liking.

    Underseat exhaust pics will follow soon. I have been meaning to post them but my life recently (isn't anybodies?) has been mental.

    Will update soon
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  28. #25
    Member Oakley_burn's Avatar
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    20130101_120731.jpg

    Just a quick snapshot of the bike on New Years Day. Please excuse the puncture - country roads are NOT cool
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  29. #26
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  30. #27
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    Looks good!!!

  31. #28
    Senior Member fatso1277's Avatar
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    oakley_burns...did you decide against the cbr600f2 swap...and where did you put yout FUEL PUMP!!! i got everything else pretty much in a place...but the damn fuel pump...lol

  32. #29
    Member Oakley_burn's Avatar
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    I have decided against the CBR f2 swap, mostly as i had just refurbed the VFR ones and i had no issues with them. I did drop the bike a 1/2" on the front which has made my riding position and handling in the corners better.

    The fuel pump. The VFR pump i had died. I know that the pump and the R/R are the two most 'unreliable' items on the bike so i got a 12V inline fuel pump from a RaceTech Landrover (12 on Ebay), it's water proof and has no moving parts inside it to corrode or be shaken about. It seems to operate in a 'pulsing' action - no idea what that means, but it's been in the bike for 18mths now and it has always started first time and i have no fuelling issues during the whole of the rev range.

    See pics for more:
    20130129_102957.jpg20130129_103016.jpg
    The Rock. The Hard Place
    '88 VFR 750 FJ, Motad S/S Exhaust Headers, Goodrich Steel Braided Lines, CBR600RR03 Tail Conversion With Underseat Exhaust

  33. #30
    Senior Member fatso1277's Avatar
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    NICE!!! thanks for the ideas...yours
    turned out great...


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