XR650L big finned head kit.

Discussion in 'Thumpers' started by cyclewizard, Oct 26, 2011.

  1. cyclewizard

    cyclewizard Long timer

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    I've been thinking of building a big finned head kit for you XR650L owners.
    You would have to find a good tig welder in your area to weld them on or send me your head and I can do it for you at a discounted rate for the ADV members here.

    The question is would anyone be interested in a kit like this that you would have to weld on"DIY"????? Here's one I built a while back.
    If I get enough interest I will start building the kit for youse fella's..:lol3
    Also some tall valve cover caps like we used to run on our old RS600 flat trackers that are finned about an 1 1/4 tall or so?

    Give me some feed back please what you guys would like.:ear

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    #1
  2. cyclewizard

    cyclewizard Long timer

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    another pic

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  3. cyclewizard

    cyclewizard Long timer

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    one more

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  4. cyclewizard

    cyclewizard Long timer

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    valve covers like this but not anodized to keep price down.

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    #4
  5. cyclewizard

    cyclewizard Long timer

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    Also thinking about a big fin kit for the cylinder..
    #5
  6. sc-razor

    sc-razor Long timer

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    Come on lottery!
    #6
  7. elsalvadorklr

    elsalvadorklr southern xr rider

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    ship to el salvador?

    I would though...we get good tig welding on stainless...is it the same welder for aluminum or is it a different type of tig welding

    sorry for the stupid question...

    also do the big finned caps fit in a stock bike/frame or do you need to modify anything?l

    I would love a set of the caps...do they aid in cooling a bit?

    thanks
    #7
  8. xr400r

    xr400r Long timer

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    I'd be interested. Anyway It could be bolt on? I know that it probably would not give as good of cooling but would still be effective and look good. I'd like one.
    #8
  9. GAS GUY

    GAS GUY MILE EATER

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    Have you done temperature testing ? How much temp drop in what conditions ?
    #9
  10. xr400r

    xr400r Long timer

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    do a kit for the xr400 too and i'll be in for those too!

    There are a whole bunch of 400ex riders out there and they are still making those. Same motor.
    #10
  11. Wattner

    Wattner Long timer

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    I can't speak for CW, but I have ran the Bigfins for years. I have always had big bore, high compression motors that were jetted pretty spot on. Friends with similar motors and jetting have all ran 15-30 degrees warmer in similar riding conditions. Team Honda used these on all of their desert bikes back in the RFVC Baja days, so I am guessing they work, and it only makes sense. What really does not make sense to me is why here are not larger fins on the cylinder where the heat is generated. In essence the heat must transfer up to the head to be dispersed by the fins, which I am sure still works, but has me thinking about the fins on the cylinder. Is there a solution on the horizon oh great wizard of cyledom? :D
    #11
  12. cyclewizard

    cyclewizard Long timer

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    I could make a big finned head kit for the XR400 if I had a 400 head which I don't right now darnit..
    #12
  13. cyclewizard

    cyclewizard Long timer

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    I think might nailed it, about 30 degrees cooler..
    #13
  14. spezjag

    spezjag Long timer

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    The real heat is not generated by the friction of the piston rings rubbing against the cylinder walls, but rather by the combustion in the cylinder head. The oil temps rise because that heat is transferred to the oil that lubricates and cools the valve mechanisms.
    #14
  15. cyclewizard

    cyclewizard Long timer

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    I think every little bit would help and it would allow you to run a big cam in the future.
    #15
  16. Wattner

    Wattner Long timer

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    Very plausible explanation.... I bet big fins on the jug would help, couldn't hurt and would look cool as well :evil
    #16
  17. spezjag

    spezjag Long timer

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    And I would be interested in this, except as a service (send my cylinder head in, have the fins installed, then returned to me). I would prefer the one stop shop so I can have confidence they're being installed correctly, and I don't have the welding skills to do it myself.
    #17
  18. spezjag

    spezjag Long timer

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    Well there is that . . .




    :lol3
    #18
  19. cyclewizard

    cyclewizard Long timer

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    If you have a good tig welder that can do stainless I'm sure he can do aluminum too.
    Yes I will ship to el salvador..
    #19
  20. cyclewizard

    cyclewizard Long timer

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    No problem I can do that for you and I might weld flat pieces of aluminum on the fins instead of the dowel pins don't know yet, the dowel pins are faster for me to do and easyier...
    #20