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Everything you ever wanted to know about the 1200 8V engine tappet failure but were afraid to ask.

Discussion in 'CARC' started by scottmastrocinque, May 27, 2017.

  1. Raven

    Raven High Miler GT Famiglia

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    No it was actually Euro emission standards that killed it. That is also why they are all tuned far too lean from the factory. Todd's fuelling fixes work wonders to remedy the problem.
     
    Bonafide Bob and GTM® like this.
  2. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    UPDATED 10/12/202

    I am attaching 2 TSB (Technical Service Bulletins) - merged into 1 PDF file - regarding Moto Guzzi's Official Position on this issue.

    PLEASE READ THEM COMPLETELY BEFORE JUST SHOOTING OFF QUESTIONS! IT ANSWERS EVERYTHING ABOUT THEIR POSITION, WHICH KIT TO USE, ETC. THANKS! - Scott
     

    Attached Files:

    V700Steve likes this.
  3. GerryL

    GerryL Just got it firing!

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    I posted on the Stelvio thread, but this may be a more appropriate place to ask the question. I'll try to delete the other thread.
    Does anyone know how to visually tell if you have 'A' or 'B' kit cam boxes? Casting numbers, etc? Last June I ordered a kit for a 2012 Stelvio with engine #AC 012424 with drill marks in heads.
    The kit I received has nothing on the boxes specifying A,B,C, or D (the boxes were actually open, with 1 set of hemispheric buttons and grounding tang loose in box, so I think someone was in there before). But anyway, the parts are all there. The AF1 site also appears to use the same photo for all 4 kits so I can't tell from that. I hadn't gotten to this job yet, so I took off this week to do it and some other projects. I haven't gotten very far; I took apart my left side cylinder yesterday and started questioning the differences I saw. After a flurry of emails with Todd between yesterday and today trying to figure this out, Todd pointed me to his forums this morning for support. So I will attach 2 photos; one has my original left side cam box next to the new one I got, the other photo is the new right side cam box.
    Can anyone tell me what I have here? I want to get this together, but I don't want to install incorrect parts and make this situation worse.
    Thanks!
    Gerry
     

    Attached Files:

  4. John Warner

    John Warner Cruisin' Guzzisti GT Contributor

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    I'm pretty sure the Camboxes themselves are identical in all the Kits, it's just the parts they come with that make the kits different, such as Valve Spring Shims, Head Gaskets, etc.

    You can make up the most expensive Kit for the Early 1200s (the one that requires the Heads to come off), by buying the cheapest Kit, and buying all the other parts you need separately, it works out a fair bit cheaper, apparently.
    The pricey Kit comes with all 3 thickness Head Gaskets for example, when you obviously could just buy the correct one for your particular Engine.

    All the Roller Camboxes are basically from the 1400 Engines, hence the second 'hole' where the second Spark Plug would be on those.
     
  5. GerryL

    GerryL Just got it firing!

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    I guess what I really need to know is what is the difference between the A and B kit as far as parts go. In our last email, Todd sent a link to the B kit saying that is what I have. But being a 2012, it seems I need an A kit. Looking at the service bulletin earlier in this thread, I can't tell what's different. 'A' kit has a similar illustration to 'B' kit other than some casting numbers that I can't match up on any of my parts. I'm hoping to hear back from Todd soon, but if anyone can contribute more info to this, please do! I'm on day 2 of what should have been a 1 day job.
     
  6. John Warner

    John Warner Cruisin' Guzzisti GT Contributor

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    Does yours have these markings?
    [​IMG]
    Inner side of the 'V', you can just about see by looking down from above, over the top of the Valve Cover.
    Either side, if one has it, they both will.
    I would expect a 2012 to have them, my 2009 does.
     
  7. GerryL

    GerryL Just got it firing!

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    Yes, it does. The confusion for me comes in when looking at the TSB. The chart says that from mid 2010 on, all Stelvios would use kit A. And my valve cover corresponds to the picture for the kit A requirement.
    Kit B asks about the mark in the head, but shows it is for the earlier model valve cover.
    And Todd said I was sent a B kit. Maybe that is in error; this is what I am trying to determine.

    Looking closer at the TSB, Kit A shows seals for the valve cover at the spark plug hole included. Kit B shows o-rings, which I received in my kit. So my thinking tells me I got a kit B but most likely need Kit A according to everything I read.
     
    Last edited: Jan 12, 2021
  8. John Warner

    John Warner Cruisin' Guzzisti GT Contributor

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    There's also a chart somewhere showing which kits goes with which model/year.
    I keep coming across it on various forums, but can I find it when I need it . . . :banghead:

    Must save it when I do this time . . .
     
  9. GerryL

    GerryL Just got it firing!

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    Isn't it in the TSB in post #82 just above? That's what I've been going by.
     
  10. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    Post a photo of the bottom of your valve covers, showing the spark plug tube sealing ring. All of the kits are in large the same outside of the oldest kits use the oldest style valve cover, where the o-ring is in a groove in the valve cover itself.
     
  11. GerryL

    GerryL Just got it firing!

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    Here they are.
     

    Attached Files:

  12. John Warner

    John Warner Cruisin' Guzzisti GT Contributor

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    That's one place I've probably seen it . . .
     
  13. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    Good, so the kit you have will work just fine. The two o-rings they gave you are simply new versions to replace what you have.
     
  14. GerryL

    GerryL Just got it firing!

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    So you are confident the cam tower/box assemblies are the same for A and B kits? And it's only the seals/o-rings that are different? Regarding the o-rings I got, those aren't for around the tube? In email we discussed the fact that the old cam towers had an o-ring groove in the bore for the tube. The new towers I got have no groove, but they do have a machined surface on the bottom; So the o-ring sandwiches between the bottom of the cam tower and the top of the head (but around the tube; the tube fits loosely in the bore of the cam tower). And I keep my same valve cover seal. Does that all sound right? Sorry for being so persistent with questions, but I can't afford to grenade this engine. Say the word and I'll continue assembling. :)
     
  15. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    Umm, it's 6 posts above yours John. :)

    #82
     

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