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XS 650 Racing

Discussion in 'The Garage' started by Grimmith, Aug 25, 2019.

  1. Jack

    Jack XS650 Junkie Top Contributor

    If not your using a high lift megacycle cam, I doubt seriously you'd see any effect on tightening up the VL other than gulling the cam lobe from inefficient
    oiling. I'd use the 256 cam or shell 1 cam if rules allow with the recommended L/S
    Try to locate a XS1 head as they had better port casting and where very consistent port to port and had a flatter floor for increasing port velocity, secondly locate virago 750 valves and cut'em down to xs stock dimensions and radius the bottom of E/V. The head designs help with flow and the thicker margins reduce resistance.
     
    Last edited: Aug 31, 2019
    Grimmith likes this.
  2. jay760

    jay760 XS650 Junkie

    Would pay to find out just how stock it has to be, you should be allowed to bore out to maximum oversize on the bores, which would mean you could put the hoos 700cc kit in, also would recommend his ignition kit, stk465 it's an electrix world unit I use them and never had a problem, it means you can get rid of all of the electrics.
    Carbs you should be able to run period slide carbs, and also as said in a previous post the shell #1 cam is about the cheapest cam going also from Hoos,
    There can be a lot of taking the rules to the limits when it comes to classic classes.
     
    Grimmith and gggGary like this.
  3. Jack

    Jack XS650 Junkie Top Contributor

    Checked it out,nice work. If you'll angle drop the front motor 6 to 10 degrees in that frame it'll feel more balanced than being top heavy, easier to flick
    it left to right. Drop the side rails, mount an angle finder to the flattest part of the head,use a racket strap to support and lower to the desired angle. Lock it
    then straddle it and flick it side to side and you'll immediately feel the difference in how it handles. You might have to drop the rear again to realign
    D/S axis to pivot axis. You can always reconstruct the side rails if you like the look. Just making a suggestion, not trying to critique your visions or workmanship
     
    gggGary likes this.
  4. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Well worth a trip to solo's build thread!
     
  5. Jack

    Jack XS650 Junkie Top Contributor

    I under stand.You might wanna look at this.
    http://www.xs650.com/threads/mule-frames.296/
     
  6. Mailman

    Mailman Hardly a Guru Top Contributor

    Well knock me over with a feather! I never knew that the legendary Richard Pollock was once an active member of this forum. What a super creative guy. :thumbsup:
     
    gggGary likes this.
  7. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    What year engine is that? I understand the 256 motors were weak there.
     
  8. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Go-with pics.
    cracked mount
    [​IMG]
    Early
    [​IMG]
    later
    [​IMG]
    More of an engineering oopsie than a cradle or not issue but I understand the "not designed for load path" strength issue as being a real one.
    Early frames are known to crack near the rear mounts area when pushed hard also...
     
    TwoManyXS1Bs likes this.
  9. Jack

    Jack XS650 Junkie Top Contributor

    The cases can be problematic due to weak webbing when pushed beyond their limits not just from stress
    but also pushing the Hp has it limits. The cases I have are "75" and have the reinforced webbing in the critical areas in those pictures. The XS engine has been mounted in a variety of stress loading frames
    and I don't think in a street riding environment will put those case weak points in jeopardy.
    [​IMG]
     
    Last edited: Sep 2, 2019
    Grimmith and gggGary like this.
  10. Grimmith

    Grimmith Samurai

    295
    288
    63
    Iowa

    My race class is nearly 100% stock, Other than removing all un needed lights, and kickstand mounts, and side panels if you choose to not use the stock panels then the only thing really after market allowed in my class is updated performance break shoes and pads, and air filters that meet standards for the class. The 700 or 880 cc bore out is allowed for racing, just a different class. I thought I would race a little bit to get used to it before I go fast lol
     
  11. Signal

    Signal XS650 Junkie Top Contributor

    Talk to Micheal Morse at Vintage Brake if you need brake parts, he also owns 650 Central.
    http://650central.com/
    Look under links for the Vintage Brake page.
     
    MrBultaco, gggGary and YamadudeXS650C like this.
  12. Grimmith

    Grimmith Samurai

    295
    288
    63
    Iowa
    I will definitely do that. My current plan was to, get this bike all ready for beginner racing as I read the rule book and build until it's complete with everything I need for however long that takes. Go to AHRMA racing school to pass test. Then race. After racing for a year or two, when I feel like I'm ready, I'll go up a few classes where the faster bikes are and what classes the the 880 to 890 cc engine bore out is allowed in. Go from there on parts, gear, etc.

    Can you win money from these races?
     
  13. Jim

    Jim Beyond the edge, is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Sure. You might even get a dollar back from every hundred invested...
    Laughing Minions.gif
     
    gggGary, Grimmith, GLJ and 1 other person like this.
  14. Grimmith

    Grimmith Samurai

    295
    288
    63
    Iowa

    Those guys from Moto GP get a decent amount lol
     
    MrBultaco and gggGary like this.

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