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Wrecked Motor

Discussion in 'Norton Commando Motorcycles (Classic)' started by Joe Hart, Aug 8, 2018.

  1. Joe Hart

    Joe Hart

    Joined:
    Aug 7, 2018
    Hello, I am new to this site. Just recently bought 1975 MKIII - fulfilling a high school promise to myself to own one. Unfortunately the motor is trashed. Had been bored out to a 950, but not well. My mechanic said it is shot. With all the knowledge out there I was hoping to get some direction on what to do next; part out the bike, sell as a roller, or find a replacement motor, or any other ideas.

    Thanks
    Joe
     
  2. dave M

    dave M

    Joined:
    Oct 19, 2005
    Joe, surely the whole motor isn’t shot, make an inventory of the useable parts you have and see if you can get replacements for those that are no good.
     
    Nater_Potater likes this.
  3. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    There aren't many things on a commando motor that can't be repaired or replaced
    Just get stuck in and do it yourself or find a place that knows Norton's to repair it for you
     
    Nater_Potater likes this.
  4. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    Most likely you will need to replace barrels, and get new pistons and rings. No big deal ..... there are barrels out there and JCC pistons are cheap, but don't use the rings JCC provides ..... use Hastings rings.

    Slick
     
    Nater_Potater likes this.
  5. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Hi Joe, that sounds like the bike that was in the Oxnard Craigslist. I thought about checking it out too.

    If it is really a 950, then the cylinder has been not just bored out, but sleeved. Unless it is damaged, it can be re-sleeved down to anything from 750 cc to 920 cc. LA Sleeve, down in Santa Fe Springs, can do the sleeving, if you choose to go that route. Or just do as Slick says, and get new cylinders and pistons.

    If you get really discouraged, you could always just sell it to me at a loss:)

    Ken
     
  6. Joe Hart

    Joe Hart

    Joined:
    Aug 7, 2018
    Wow!!! You guys are great. It was the Oxnard "950" - jumped before I looked. I am getting the bike back from the mechanic today and will get a list of what's actually wrong - I know the pistons, sleeves, valves, cases and cam are all shot. My guy says it probably never ran after the work was done to it. He guessed a number of different folks worked on it over the years and it only got worse.Once I get a good list, I will post it and look for direction. I REALLY appreciate the help - this is my first Norton and first attempt at restoring a classic.
     
  7. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Who is the mechanic?
     
  8. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Is your mechanic John Ireland, by any chance? If so, he's quite good.

    Ken
     
  9. Joe Hart

    Joe Hart

    Joined:
    Aug 7, 2018
    Lance at City Garage in Santa Clarita.
     
  10. swooshdave

    swooshdave

    Joined:
    Apr 15, 2009
    Be sure to post pictures of the damage.
     
  11. Nater_Potater

    Nater_Potater

    Joined:
    Apr 7, 2013
    What happened to the cases? If it's a matter of the spigots being bored out to accept the larger sleeves, I believe anyone making sleeves to bring it back to stock could use oversized sleeves thick enough to make up the difference. Assuming the jugs are okay to re-sleeve, that'd also take care of the cases. Like the man said, "pictures".

    Have fun!

    Nathan
     
  12. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    Worst case scenario, you can find complete engines if you are patient. SOMETIMES they fall into your lap!

    You now likely have over a half-dozen folks already keeping their eyes and ears open for you (2 Daves, Baz, Slick, Nathan, Ken & myself)...

    The folks on this forum are all the resource a person would ever need, JUST DON'T ASK WHAT OIL TO USE! heehee
     
    Nater_Potater likes this.
  13. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    This may be THE FIRST "new member" thread that gets moved to the "Norton Rebuilds" section...
     
  14. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    Or ask about using an anti sump valve of any kind!
    Or claim you have the twistiest roads:)

    Glen
     
    Nater_Potater likes this.
  15. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    ...and don't mention the WAR!
     
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  16. rvich

    rvich VIP MEMBER

    Joined:
    Jul 25, 2009
    This place is great. There are people here who know everything. Once you figure out who they are, you can avoid them and seek advice from those who are still learning!
     
    Last edited: Aug 10, 2018
    swooshdave, manx850 and Nater_Potater like this.
  17. Nater_Potater

    Nater_Potater

    Joined:
    Apr 7, 2013
    Which war was that?
     
    Last edited: Aug 9, 2018
  18. 84ok

    84ok

    Joined:
    Aug 10, 2014
    if you run across bits, make sure they are compatible for use

    on a 1 year only factory 850 electric start engine setup with shifting on the left side,

    find out what all is involved in paying someone to sort it all out, before deciding which way is best for u to go
     
    Last edited: Aug 9, 2018
  19. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    It's an old John Cleese line from the BritCom "Fawlty Towers"... (you've got to watch it)
     
  20. robs ss

    robs ss VIP MEMBER

    Joined:
    Aug 16, 2016
    ...I did once but I think I got away with it!