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Heart Transplant

Discussion in 'Norton Commando Motorcycles (Classic)' started by swooshdave, Aug 17, 2018.

  1. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    They had instructions to replace the seats if they needed it. Supposedly the valve should be set to spec. We’ll see when the head goes on.
     
  2. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    What does ‘set to spec’ mean tho swoosh?

    Do we mean ‘factory’ / ‘stock’ spec?

    Maybe they set the spring heights to stock spec?

    By very definition, there’s no way you can cut that much metal from the seat area in a ‘stock’ head and it still be to ‘stock spec’ ?!
     
  3. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Val
    Spring and valve height.
     
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    If the seats have been cut, the valve heights MUST be different to stock.

    So I would suggest your man means that he shimmed the valve springs accordingly in order to get the spring height BACK to spec after cutting the seats.
     
  5. comnoz

    comnoz VIP MEMBER

    Joined:
    Dec 10, 2008
    Well, springs can be shimmed and you can get away with a lot of extra valve stem height, Black Diamond valves are not normally shortened but you may need to shorten the pushrods.

    And it's likely that the loss of compression due to the sunk valves is a good thing on a Combat head.
     
    Last edited: May 16, 2019
  6. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    After all my parts were vapor blasted (glass media) I washed them with a mild detergent and hot water with bristle brushes and hole brushes, then 2x pressure washed them to rinse.
     
  7. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Yes, planning on washing the parts.
     
  8. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
  9. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    [​IMG]
    Need to put this back in with the hole down.

    [​IMG]
    .022" Perfect.


    [​IMG]
    Last dry fit. New hardware made for a lovely presentation.
     
    Mike T and Northton like this.
  10. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Sealed up and ready for the next step, getting all the timing side stuff on. I almost got the cam washer in wrong. Luckily I checked the manual and it said flat side against the case.

    [​IMG]
     

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