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  • Engine Compatability?

    I have an 79 speical engine, I want to put into my 81 standard.

    I know the TCI and carbs might be different, I can deal with that, but will the engine fit? Bolt right in, as it were?

    On a side note, sometime this winter I might end up with most of a 79 special, or some of one, anyway, that would be reealllyy cheap, or maybe even free depending on what's left, to a good home, with pick-up required. I won't have anywhere to keep it.
    I've been in more than one Hemisphere, and I wrote a book to help you do it too (or just prepare better for that week long road trip). Going Small, not just for the little guys.

  • #2
    Hey there Pain,

    Yes, the engines are Bolt and Play! Instead of trying to use the 79 box, swap out the timing cover ignition components from the 81 to the 79. The 81 doesn't use a centrifugal advance, it's built into the TCI, just uses the vacuum advance. The 79 has both, and you'll get too much advance if you leave the 79 parts in! Have fun!

    Wish I was in the area, could use some more 79 special parts!
    T.C.
    T. C. Gresham
    81SH "Godzilla" . . .1179cc super-rat.
    79SF "The Teacher" . . .basket case!
    History shows again and again,
    How nature points out the folly of men!

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    • #3
      Yep. Do what TC says. I did exactly that. It is cake.

      Originally posted by TopCatGr58
      (snip)
      Skids (Sid Hansen)

      Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

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      • #4
        hmmmm... Keep us posted on the parts. I may need a couple 79 parts. Live real close too. Will do what I can to take the parts off yer hands.

        Get ready for the snow!
        "If it weren't for a budget I'd be bored."

        Thom
        79 xs11sf - Rented Mule
        80 xs11sg
        81 sr250t- sold to Pain

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        • #5
          Me too. I'm exactly in the center of WI
          put something smooooth betwen your legs, XS eleven
          79 F (Blueballs)
          79 SF (Redbutt)
          81 LH (organ donor)
          79 XS 650S (gone to MC heaven)
          76 CB 750 (gone to MC heaven)
          rover has spoken

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