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BSA Spitfire Mk IV

Discussion in 'Other Motorcycles' started by dkavanagh, Jul 22, 2019.

  1. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    I found I never started a thread for this bike. It's a '68, last on the road in '77. I've finally gotten into the engine and it has +.020 pistons and the bores look pretty good, just need a hone. I have a series of videos I'm posting about the work on the bike. I posted 3 this past weekend!
     
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  2. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    Screen Shot 2019-07-22 at 8.25.49 AM.jpg I noticed there's a tube between the 2 intake runners on this bike. I think Yamaha's YICS wasn't an entirely original idea!
     
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    That tube balances the amount of fuel that leaks into each cylinder when the floats get pinholes in them :p
     
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  4. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    yea, I was thinking about having it drain down to the hot exhaust.
     
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  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    That's a Harley thing. Patented too.
     
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    In all seriousness I have a bit of envy. I was very tempted by a '67 Lightning in the early 90's. I had to pass it up because $2200 was a bit too steep for me at the time. Seems like a bargain now though.
     
  7. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    I'm updating that youtube playlist regularly as I do more videos. I'm also posting in the britbike.com BSA forum as I go. Those guys are bringing me up to speed a bunch like when I joined here!
     
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  8. JBurch

    JBurch Member

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    It''s good to see another Brit bike owner here, now I don't feel so out of place.

    Crank shaft rides on a ball bearing on the primary side, and a bronze bushing on the timing side; there is an up grade to a real bearing that can be done, depends on how hard are you going to ride it.
    Dick Mann "Buggisey" used to race them in AMA.
    "Earth" is "Ground" and it's positive
     
  9. Kickaha

    Kickaha Active Member Premium Member

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    I'm another one, 1956 BSA A10 Gold Flash [​IMG]
     
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  10. dkavanagh

    dkavanagh Well-Known Member Premium Member

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    Looks like my bike had a bearing upgrade of some type that timing side bushing was problematic, so various other solutions we're tried. ( Can't seem to upload the photo from my phone)
     
  11. dkavanagh

    dkavanagh Well-Known Member Premium Member

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