BW80 aka “The Witch”

Discussion in 'Some Assembly Required' started by greasyfatman, Dec 3, 2020.

  1. greasyfatman

    greasyfatman Long timer

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    Ya I keep my eyes open for a parts bike PW80 all the time. If you see another BW80 out put shaft or stator cover shout.
    #61
  2. greasyfatman

    greasyfatman Long timer

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    960FEEA8-1A50-4270-8E34-993E67CA9B04.jpeg

    That complete shit-skerdo is my wisky fueled start to a 20mm intake.
    #62
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  3. nostep

    nostep Been here awhile

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    Whisky and an angle grinder, what could go wrong? :rofl
    #63
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  4. greasyfatman

    greasyfatman Long timer

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    What could go right? Have to see if the carb fits in the old carb space. Air box will need to change orifice size. If I get the tig set up I might do an aluminum air box or read your thread again and use composite.
    #64
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  5. nostep

    nostep Been here awhile

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    Car-bon car-bon car-bon! :clap

    I'm a fan of aluminum too. There's a tig in my not too distant future.

    Looking forward to seeing how you tackle it.
    #65
  6. greasyfatman

    greasyfatman Long timer

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    Sloppy or Whiskey straight, it’s a bike to test things out.

    Could I use a plastic air box as a mold for carbon fiber?
    #66
  7. nostep

    nostep Been here awhile

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    Sure, if you post a picture or two, I can help determine some ways to tackle it.
    #67
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  8. greasyfatman

    greasyfatman Long timer

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    Started putting the new ignition on.
    #68
  9. Nathan_66

    Nathan_66 Been here awhile

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    Nice! But now it needs a windowed cover :nod
    #69
  10. greasyfatman

    greasyfatman Long timer

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    well I cant measure shit. Fly wheel hits the stator plates before the taper reaches the crank.

    is conical shim a thing?
    #70
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  11. greasyfatman

    greasyfatman Long timer

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    So the two steps forward three steps back thing associated with not having a clue what I am doing is now comical more than frustration. New ignition is shelved, going to put the old one back. Then test the vm20 carb. My complete shit ability to weld I made multiple attempts at a manifold. Little pin holes everywhere, i think from having zinc coated pipe. 770755B8-0457-44E1-9BBB-1322289D1518.jpeg VM 20 attached and some air box mods soon.


    Anyone know about how much filter surface I might need?

    Is 13k RPM possible?
    #71
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  12. greasyfatman

    greasyfatman Long timer

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    Pilot jet is too big but I wanted safe jets to get it started. It lags slightly when I grab full throttle. But feels like better mid and top. I will get some testing done to to see if I made it faster or slower. It sounds good at an idle.
    #72
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  13. Nathan_66

    Nathan_66 Been here awhile

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    sure looks like a great improvement without that ridiculous bend in there, looking good! :thumb
    #73
  14. greasyfatman

    greasyfatman Long timer

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    http://concubidated.com/ignition.php?stroke=45.6&length=94

    Neat spreadsheet lets you calculate degrees by movement of piston.

    22AE3434-DCE4-43DB-960B-79812EE04F91.jpeg

    Timing mark was off by close to 90 degrees. I have a new battery powered timing light now. If I can get some help with the stop watch today could get some testing in. Ordered a stick on temp monitor for the head so I don’t melt it down.
    #74
  15. greasyfatman

    greasyfatman Long timer

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    Got my head light in but they sent the wrong harness. Called baja and they are shipping the correct one with a connector too.
    #75
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  16. Nathan_66

    Nathan_66 Been here awhile

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    That is a very nice headlight you picked! Makes the one I got seem...square. haha!
    #76
  17. greasyfatman

    greasyfatman Long timer

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    My bike now makes DC got a head light there too.
    #77
  18. sruss67

    sruss67 Been here awhile Supporter

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    Woohoo, looking good.
    #78
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  19. greasyfatman

    greasyfatman Long timer

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    Made some jetting changes running 25 145 and that was the biggest I have. Temp sensor on the head sure is nice.
    #79
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  20. greasyfatman

    greasyfatman Long timer

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    My brake drum/hub was sandblasted by thepeople that did the powder coat. Bike has no brakes.

    Anyone know how to re shoe or fix the drum?
    #80