Any body else out there racing an RC24???

Discussion in 'Racing & Track Days' started by Jason Light, May 16, 2011.

  1. DeltaHotel

    DeltaHotel New Member

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    Great Thanks for the info. I NEED those DVD's
    I know/knew all those guys (RIP, Johny B", Jimmy, and as I said before Randy. Hard to believe it will be 10 years this summer since Randy passed)
    I still see Dan Chivington at Mid-Ohio Vintage every summer.

    DH
     
  2. Jason Light

    Jason Light New Member

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    Wow,

    Thanks for posting up some great pics there! I wonder how many race RC24's are still out there, either being raced or in sheds???
     
  3. DeltaHotel

    DeltaHotel New Member

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    Here's a great video from the 1986 Daytona. As seen on the old show, MotoWorld with Larry Maiers.

    http://superbikeplanet.com/2012/Feb/120227superteams.htm

    Lot's of great '86VFR/RC24 action. Eddie prevailed that day on his factory Yamaha FZ750, but it was a great day and this is a cool vid!

    DH
     
  4. Bubba Zanetti

    Bubba Zanetti Member

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    Not a two stroke fan? Have you ever riden one rc24rc51?

    BZ
     
  5. FINRautsi60

    FINRautsi60 New Member

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    HI, yes RC24!
    i have new job to make RC24 to roadracing bike to Finland classic F1-race.
    1988 model, do you have tips inside engine and racing cowls and any parts??
    Rautsi
     
  6. Jason Light

    Jason Light New Member

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    Rautsi,

    Good to see someone else getting an RC24 out there! There is not a huge amount that can be done to these engines. It really depends what you want to do - just get out there or do you intend to be very competitive - what else will you be racing against for example.
    My engine is stock, it is running total loss, has a Yoshimura system, jetted up and no airfilter. I have concentrated on getting the weight down and on suspension set up. If you wanted to do some serious engine work you would still be able to find some cams, Megacycle maybe, gas flow the head. You may still be able to find some Cosworth hi comp pistons that were available at the time, but if you use those you will have to use different (expensive) spark pugs for clearance and also probably run it on Avgas. I understand there is not a lot can be done with cranks (unless you want to split them and go 360 degree firing order...but that's a lot of re-engineering). The valve lash gears can be removed although there is some argument about whether there is any real benefit to do so. There is a lot of reciprocating mass in the engines that can be slimmed down, cams can be bored out more, primary drive reduced and so son. Any moderate increase in power will also start to challenge the cooling system so a bigger rad would be needed. Race glass - there is not a lot around, I would suggest if you are going to keep the bike for a while to make moulds and do your own. RC gear clusters will go in but the clutch drive is different. My bike has RS250 wheels which are a lot lighter and made a big difference. Front forks are CBR600F3/same lowers as 1990 VFR. It also depends on what the rules are for your F1 class - what can you do / not do?? I don't have a lot of parts myself. Rear shock is a modified Ohlins off a late 80's GSXR750. There are some shock options around still. Forks are 41mm so plently of clip-on options around altough there is not enough clearance to run them under the top clamp, unless you reposition the fairing quite a bit. Hope this helps and let us know how you get on!
     
  7. TitusV4

    TitusV4 New Member

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    Jason,

    nice to read about you and your bike. I also want to turn my ´88 VFR into a vintage race bike. I've got a question about your front end. You mount a CBR600F3 front-fork with the original triple clamps? I think the CBR-fork is much shorter then the RC24-fork!? What kind of bar have you mounted?
     
  8. Jason Light

    Jason Light New Member

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    Titus,

    Wie gehts? Ich habe deutsch gelernt als ich ein kind wahr, im Schotland dan spater hier im Australien. Aber meine erkenntnis von deutsch diesen tagen is ganz klein, weil ich nie sprechen, lesen usw. I habe viel vergisst.

    Anyway, to VFR's. yes, the F3 fork is quite a bit shorter, but this is desirable since it drops the front for better steering. You could also use VFR750 FL forks as they were still 41mm and the sliders, calipers and guard are the same as the F3, but you will have a lot of fork left sticking out of the top clamp. I use KR1-S clip-ons on my bike, but on the top of the clamp not under, as there is not enough room to clear the fairing. If you only put F3 forks on it lowers the ground clearance, but if you are racing it is a very good idea to get a longer shock (either extend or get a rider height adjuster) plus race tuned suspension will keep the bike from sitting too low in the suspension stroke. You also need to put a slip on single muffler or full system to get better ground clearance too. What are the rules for the class you will race in?? have you done anything to the bike or is it still stock?


    Rgds, Jason
     
  9. TitusV4

    TitusV4 New Member

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    Hi Jason,

    schön was auf Deutsch zu lesen! Ich fürchte mein Englisch ist um einiges schlechter. Hoffe Du verstehst mich trotzdem.

    Incidentally, I have done my best holiday trip with my VFR through Scotland. Take the ferry to Newcastel and then counter-clockwise from Edinburgh. (and it has only rained 10 out of 14 days :) ) The single-road tracks make the bike really fun.

    Thank you for the informations. So far I have only reworked the fork anf fit new springs. I mounted as well a slightly longer Wilbers fully adjustable rear shock. I dont know if it is long enough to gave enough ground clearance with the shorter PC31-fork. But a rider height adjuster can be added on.
    At the moment i only find a 4-1 Motad slip on for the RC24, don't know if it will be a good alternative.

    The rules are relatively open. Criterion are first of all the year of manufacture and engine size. Modifications may be made.

    Rgds Titus
     
  10. Jason Light

    Jason Light New Member

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    Only 10 days of rain? It must have been a good summer that year! Believe me, your english is excellent like most germans, and probably better than a lot of Aussies! I thought I could speak German until I went there in 1996 on a holiday, I was humbled, and would try and speak it but most people replied in much better english!

    The Wilbers shock is probably a good start and as you say a ride height adjuster can be fitted if needed. Has the shock already been set up for racing or is still in road trim? I say that because they are very different demands, so a well set up road suspension will still not be ideal for the track, and vice versa. There are a lot of slip on mufflers for the V4's as the full system is quite hard to change so many people just buy a can. I thought Motad made a 4 into 1 but they are usually just a copy of the standard system. I bought a second hand Yoshimura system from the US which made a reasonable difference to the top end power especially and was lighter too, but it was from the 86-87 model so didn't fit exactly onto the 88-89 (they fit up to the cylinders the same but interfere a bit with the 88-89 fairing and brackets, and the rear suspension linkage so we had to modify the pipe a bit at that point). The best changes I made to my bike after good suspension are lightweight wheels, quick action throttle and getting as much weight off as possible.


    Rgds, Jason
     
  11. RG07

    RG07 New Member

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    Currently building an 86 to run at the track....Canada...Not race but do some intense track days I hope...Many mods completed but still trying to finish off the bike....installed new front and rear suspension.....
     
  12. Joep

    Joep New Member

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    Same here. Also have two VF's 'prepped' for the track. But prefer the VFR because because it's much quicker and (knock on wood) reliable compared to the VF's.
    Had two races last year and now setting up for some more this year.
     
  13. Gator

    Gator Insider

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    Post photos!
     
  14. Captain 80s

    Captain 80s Member

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    Same boat here. Getting closer, almost ready to start it. Haven't even updated my build thread yet. 86 700.
    20160103_082647.jpg 20160103_082720.jpg
     
  15. Joep

    Joep New Member

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    Here some pictures of the V4's
    Pic 1 First race with the VFR at Assen, the Netherlands this year
    Pic 2 and 3 Second race at Spa, Belgium
    Pic 4 This is what I want to do with the fairing. For a German racingseries I compete in you're not allowed a whole fairing. Tophalf is allowed and you need an oilcatch. So I think this will be a nice compromise, I don't like the look of just the topfairing. But it does mean a weightgain.... Oh well, a little to make it better looking, I can live with that.
    Pic 5 The VF with some modifications at Assen in 2014
    Pic 6 My other VF at Oss in 2012, the Netherlands during a 3-hours endurance


    uitsnede van foto P5308938.jpg 2015-07-05 3333 Franco BC.jpg Bikerspix 01.jpg Veurbeeld VFR mit half aafgezaegde kuup.jpg 14AG3-1516-040.jpg Oss 2012 01.jpg
     
  16. Gator

    Gator Insider

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    Nice photos. Do you like your Shark helmet?
     
  17. Captain 80s

    Captain 80s Member

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    Nice pics!
    What is the reasoning behind the rule regarding fairing lowers? The fairing mid sections will make it look a lot better. And looks are part of the equation ;-)
    What forks are on the VF750Fs?

    Here's a couple of my 1st Gen race bike, VF500F
    [​IMG]
    [​IMG]
     
  18. Gator

    Gator Insider

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    That is a very nice collection Captain 80's.
     
  19. Joep

    Joep New Member

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    Yep I liked it, had it for some 6 years. It's a RSI. Never had any problem with it. And for my head the fitment was great. Now I have switched to HJC. Like it a lot, even more then the Shark and great value for money.
     
  20. Joep

    Joep New Member

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    Don't know what the reason behind the rule is. It's just the way it is.

    In the white-blue the forks are two right legs of a VFkR which are worked over.
    In the red-white-blue it's a RS500
    The VFR has a CBR600f4 frontend
     
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