007, A Laverda 1200 Story

Discussion in 'Some Assembly Required' started by G 981, Dec 3, 2018.

  1. G 981

    G 981 Been here awhile

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  2. villageidiot

    villageidiot Long timer Supporter

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    interesting looking at the crank and its phasing.

    on a 4 cylinder, you can assume a 180* crank phase, 2 up 2 down, and on a parallel twin theres 180, 270, or 360* phasing, but i never thought about a triple. is the crank phasing 120*?

    great thread this.
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  3. Tripletreat

    Tripletreat Long timer

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    Early Laverda triple engines had 180 degree throws on the cranks. Later engines had 120 degree throws and were rubber mounted.
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  4. Tripletreat

    Tripletreat Long timer

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    Grant, you are using the original con rods?
  5. G 981

    G 981 Been here awhile

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    The original prototype used a 120 degree crank but they had vibration issues (this was late 60s) so they switched to a 180 design, one of the earliest big bang engines.
    Basically a 4 cylinder crank with one rod missing, and a heavy alternator rotor acting as substitute.
    In 82 they introduced the 120 Jota which used similar frame and bodywork to the 180 Jota but had a rubber mounted 120 engine. This was a one year special as a stepping stone to the RGS range. I have owned 3 120s in the past (120 Jota and 2 x Corsas) and now this one. I have never been a fan of the 120 engine as I feel it can actually give more vibrational issues (for me) than a solidly mounted 180. Different type of vibes that play merry hell with my fingers on long runs, like white finger vibration. The lower frequency vibes from a 180 don't bother me at all.
    I thought long and hard about rephasing this to a 180 but in the end I sourced a good used 120 crank. Laverdas are like Lego so it would have been very easy to rephase to 180. Rephase crank, fit 180 cams and a 180 ignition system (all of which I have).
    Anyway the die is cast and it will remain a 120.
    Yes, original rods. I threw a rod in a 79 Jota in the early 80s, didn't stop me thrashing the arse off it when rebuilt with standard rods. Such is life, shit happens. I have no issues riding this hard once built, it would be rude not to.

    Had a ride out today on a customer bike (French) to rack up some miles on the freshly built engine before torqueing the head down again and changing the oil. Difficult job but someone has to do it! Blasted down to Inveraray, a well known bikers haunt at weekends.

    [​IMG]2019-04-13 12.27.43 by Grant Duguid, on Flickr
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  6. chris a

    chris a Been here awhile

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    Looks like you had a nice and crisp ride Grant! Really enjoying to see the bike progress.
  7. G 981

    G 981 Been here awhile

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    Crisp is a good word for it. My first ride of the year and a bit ring-rusty but it soon all came back to me.
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  8. Kai Ju

    Kai Ju Long timer Supporter

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    I was surprised to hear that the 180 is more comfortable than the 120, but the more I think about it the more sense it makes.
    I'd have to think it's high amplitude but low frequency for the 180 and low amplitude but high frequency for the 120.
  9. G 981

    G 981 Been here awhile

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    It is for me, others can and do say differently. The 120s are also harder on the carbs as I often find more wear in the slides for example. The factory knew about this I guess as they changed the lifter cable inside each carb for the slides to a solid rod from braided cable, and the carbs are rubber mounted instead of rigid as on series 1 triples.
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  10. G 981

    G 981 Been here awhile

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  11. chris a

    chris a Been here awhile

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    Shit.....
  12. villageidiot

    villageidiot Long timer Supporter

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    Bummer!
  13. G 981

    G 981 Been here awhile

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    She is fighting tooth and nail, but I'm determined she will live again.
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  14. villageidiot

    villageidiot Long timer Supporter

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    27E24474-1C9D-4074-85CA-B97B03DE55AD.jpeg D50F3903-61EE-4D52-9AF8-9EE3A88871EB.jpeg

    From the local monthly vintage bike meet in my area.
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  15. G 981

    G 981 Been here awhile

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    Good news about 007.
    The latest crack got welded today and the cases have been blasted again to 'weather' the fresh weld area.
    The cylinders are being bored out (from 1000 liner size to 1200 liner size) and new liners being fitted this week so potentially all the engine parts will be here by end of next week.
    Can't wait!
  16. G 981

    G 981 Been here awhile

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  17. G 981

    G 981 Been here awhile

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    Slight progress.
    The crankcases for 007 are ready for shipping back from Germany after laser welding, and the oil pump I need for the blue bike's engine build is on it's way too.
    Other than that I have been too busy working on customer bikes.
  18. G 981

    G 981 Been here awhile

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  19. advNZer?

    advNZer? Long timer

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    always had a soft spot for Laverdas, rare in NZ
  20. G 981

    G 981 Been here awhile

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    I have sold a few there. I know of one guy with about 12 of them.