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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    Just got the crank cases back from vapour blasting.
    They will need cleaned out now to remove the blast media.
    I may also wipe them with a solution that will calm down the unnatural shininess they now show.

    [​IMG]2018-12-12 13.32.44 by Grant Duguid, on Flickr
    #41
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  2. Kai Ju

    Kai Ju Long timer Supporter

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    Looking good.
    Obviously a split type cam chain. What kind of master link ? Rivet, I would assume ?
    #42
  3. G 981

    G 981 Been here awhile

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    Split link
    #43
  4. G 981

    G 981 Been here awhile

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    Oh dearie me. There were already a couple of issues with the crank cases I had spotted before vapour blasting but today I found a doozie.

    Drive chain must have snapped at some point and centre punched the casing ahead of the drive sprocket. The casing is holed but it is not oil-bearing at this point, and is hidden by a polished cover and also the starter motor.

    [​IMG]2018-12-13 13.28.12 by Grant Duguid, on Flickr

    [​IMG]2018-12-13 13.28.27 by Grant Duguid, on Flickr

    One of the bottom engine mount studs has sheared off flush with the casing.

    [​IMG]2018-12-13 13.31.17 by Grant Duguid, on Flickr

    And the biggie is that the upper rear engine mount has a massive crack. Needs welding.
    I have asked my guy if he can have these laser welded. Almost a heat-free process so no casing distortion.

    [​IMG]2018-12-13 13.27.48 by Grant Duguid, on Flickr

    [​IMG]2018-12-13 13.27.56 by Grant Duguid, on Flickr
    #44
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  5. Bt10

    Bt10 Been here awhile

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    My laser welder would not penetrate anywhere close to fixing that, maybe .02" at most. Are you doing something different?
    #45
  6. G 981

    G 981 Been here awhile

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    It's roughly the same thickness ae a casing I had laser welded recently so hopefully it's possible.

    [​IMG]DSCN8291 by Grant Duguid, on Flickr
    #46
  7. Bt10

    Bt10 Been here awhile

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    Yeah, I didn't comment on that since its not really structural, but a rear motor mount might be a bit thick for this process. Filling the corroded pits was a great idea though.
    #47
  8. G 981

    G 981 Been here awhile

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    My welder says he has done a few like this so I have every confidence.
    #48
  9. tinwelp

    tinwelp Professional Idiot

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    My 'rule of thumb' for penetration depth of pulsed laser welding in keyhole mode is between 3 and 4 times the spot diameter at best. There are sophisticated prediction tools out there for specific applications, but the acid test is always weld then section (obviously not appropriate here). Having said that, I'm not a specialist, just a user of the process with more than a bit of experience with several welders. I expect your guy knows more than I do, but it wouldn't harm to ask the question when there's a structurally important bit involved.

    Thanks for the excellent write-up so far and please keep going!

    Cheers... Paul
    #49
  10. G 981

    G 981 Been here awhile

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    My guy is well-versed in this and has done it various times before. He is also a Laverda engineer so I have full faith when he tells me it can be fixed.

    So, today I removed all the crank case studs and packed them up and got them in the post.

    [​IMG]2018-12-14 10.40.16 by Grant Duguid, on Flickr

    [​IMG]2018-12-14 10.57.34 by Grant Duguid, on Flickr
    #50
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  11. chris a

    chris a Been here awhile

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    Love your work Grant...and thanks for all the updates.It's a pleasure to read you.
    #51
  12. G 981

    G 981 Been here awhile

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    Thanks, always seems I'm posting without many responses so hard to judge if folk like what I'm doing or not.

    Talked it over with my engineer friend and he will cut a 'V' each side of the crack and build it up. He has had many such examples as this engine mount is the least supported of all of them. He hasn't had any failures after welding so on that basis I'm happy to proceed.
    I hear what you guys say, but my guy says it can be done.
    #52
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  13. G 981

    G 981 Been here awhile

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    This project is going to be completely standard except for one crucial area.
    AS there is no electrical or ignition system to start with I'm going to fit a modern uprated one. I have this system on my other bike.
    First is a 3 phase 250W Kawasaki alternator that is better able to cope with the electrical demand than the original single phase 125W system. The ignition triggers live in the same region and will be replaced by a modern Ignitech system.
    This is able to be plugged into a PC and advance curves modified if required for tuned engines.
    I won't need that facility as this engine will be in original lowly state of tune. (8:1 pistons, A11 cams)
    Also in the new system is a modern Shindengen r/r and Nology coils.
    All in all a very worthwhile upgrade.

    Here's one I prepared earlier.

    [​IMG]1 by Grant Duguid, on Flickr

    [​IMG]2 by Grant Duguid, on Flickr

    [​IMG]5 by Grant Duguid, on Flickr

    [​IMG]8 by Grant Duguid, on Flickr

    [​IMG]9 by Grant Duguid, on Flickr
    #53
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  14. Tripletreat

    Tripletreat Long timer

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    Rest assured you have an audience, Grant!
    #54
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  15. Kai Ju

    Kai Ju Long timer Supporter

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    Yes he does.
    #55
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  16. G 981

    G 981 Been here awhile

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    As yet the crank has not arrived at destination. Usually the parcels take 3 days, this has been 6...

    Still, be positive.

    The earlier photo I showed had the 1200 wearing TT100s, so I may go for that type when ready.
    I fitted them to a 750 I restored a couple of years ago (that now lives in sunny California) and they really fitted the period look.

    [​IMG]2015-07-23 16.29.24 by Grant Duguid, on Flickr

    [​IMG]2015-12-21 16.03.20 by Grant Duguid, on Flickr

    Before anyone rants on about not being up to the job, all I can say is that back in the day I was MUCH faster on my Laverda 1200 wearing TT100s, standard brakes and suspension and stock engine that I ever am on my super trick current Laverda.

    [​IMG]2018-06-30 13.44.27 by Grant Duguid, on Flickr

    Spot the standard part. (you're probably wrong!)
    #56
  17. vfxdog

    vfxdog Been here awhile

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    Grant- I'm really enjoying this.

    I bought a Jota new in 1976 and used it daily for 6 years- commuting, touring, going to the shops- possibly the best bike I have ever owned. Zero problems, with the exception of the occasional flat battery due to the pathetic alternator, and the usual small tasks putting things right when it came back from being serviced by our old friend Phil.

    Prior to the Jota I had a Triumph Trident- what a joke of a bike that was. I was lucky if I got 30 miles without something going wrong or falling off, whereas with the Jota I could (and did) jump on and ride from London to the South of France and back, just for fun.
    #57
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  18. G 981

    G 981 Been here awhile

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    Good news today, the crank finally turned up several days late at the engineer's shop.
    Phew.
    I have a spare but it's better the original will be reunited with the cases soon. Saying that, the cases are still in transit to the same destination. Better not jinx it!

    Been busy this weekend doing a post mortem on a triple engine. It's REALLY not pretty, and I haven't even got the cases apart yet. From what I see the cases can't be saved. Everything gouged, twisted, carved and shattered. I can already see that a crucial oilway has been destroyed. Shrapnel everywhere.

    [​IMG]2018-12-16 10.29.30 by Grant Duguid, on Flickr

    [​IMG]2018-12-16 10.51.37 by Grant Duguid, on Flickr

    [​IMG]2018-12-16 10.59.34 by Grant Duguid, on Flickr

    [​IMG]2018-12-16 11.04.25 by Grant Duguid, on Flickr

    [​IMG]2018-12-17 11.41.49 by Grant Duguid, on Flickr
    #58
  19. farmer_fred

    farmer_fred mostly paved

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    Can't like! Good luck with that one.
    #59
  20. Kai Ju

    Kai Ju Long timer Supporter

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    Clean it up and turn it into a coffee table...
    #60