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Airone help

Discussion in 'MonoCylindrico' started by clive, Oct 23, 2018.

  1. clive

    clive Just got it firing!

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    Hi.
    I am the very proud owner of an early 50s' Airone sport. After a few teething problems after purchase I got it well sorted and it ran superb - so much so in fact I manage to wear a brand new rear tyre out this summer.

    I've noticed that it has developed a small amount of lateral movement at the flywheel. Ah main bearings me thinks. So to cut a long story short I decided to change them - after all they wont get any better if left. especially as I intend to use the bike as much as possible next summer.

    Anyway I got the motor out and started to strip it down. Everything was going fine till it came to remove the inner manicotto dentato (as I believe they are called) from the gearbox output shaft.

    My Italian is in very short supply but after looking at the workshop manual - Fig 11, I got a good fitting C spanner and a socket on the clutch hub nut assuming the manacotto would unscrew whilst the shaft was held by the socket on the clutch hub nut. unfortunately all that happened was the clutch hub nut unscrewed. So either the manacotto is screwed on really tight (I expected the clutch hub nut to be tighter, thus letting the manacotto unscrew before the nut) or I'm doing something wrong.
    I'm not a novice when it comes to spanner work, but I have never worked on anything of this vintage before so rather than carry on and risk damage I thought I should seek some advice/help from somebody that has more experience of this motor than I have.

    So my question is - have I misunderstood or rather misinterpreted the picture and I am going about it completely wrong?

    Any help/advice would be most appreciated.

    Thanks in advance.

    Clive
     
  2. clive

    clive Just got it firing!

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    Anybody?
     
  3. GT-Rx®

    GT-Rx® Administrator Staff Member

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    Hi Clive, I'm trying to get my buddy Mike (below left) comment. He and our friend Patrick just got back from a big trip in Morocco shown below.

    M-PH-MGCG.jpg
     
  4. clive

    clive Just got it firing!

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    HI Todd.

    Thanks. That would be much appreciated.
     
  5. Mike Peavey

    Mike Peavey Just got it firing! GT Contributor

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    Hi Clive,

    Sorry for my late response, I had my right knee replaced the day after your 10/23 post, so I've been somewhat out of touch.
    You are correct, if the flywheel is moving, at all, side to side, you likely have a bad crank bearing. I too had a loose crank bearing on my 1954 Airone Sport, mine was the very expensive right side bearing. As an aside, I found the problem to be the bearing housing in the crankcase half, at least on mine, the plain aluminum had been simply peened over onto the bearing housing to keep the bearing in place. I then reset the new bearing into a bed of Loctite 680.

    It has been a number of years ago since I've done this, so let me have a look at my notes and photos, but I seem to recall that I discovered, as you have that the clutch nut loosened independently of shaft. I seem to recall I may have held the clutch hub itself rather than the clutch hub nut.

    Apologies for the delay and lack of any real help.

    Best regards,
    Mike Peavey
    Boston
     
  6. clive

    clive Just got it firing!

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    Hi Mike.

    Hope the knee is on the mend nicely.
    I thought I might have to hold the hub but I was unsure as to whether the manicotto has a left hand thread same as the outer one.
    Can you remember?

    Regards

    Clive
     
  7. Celia Williams

    Celia Williams Just got it firing!

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    AWESOME photo ! Great to see the bikes out in action... and great outfits, too!
     
  8. Celia Williams

    Celia Williams Just got it firing!

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    Airone advice needed ! Hi Guys, this seems to be the place to ask some basic Airone Q's. I just bought a nice example of an Airone and before I get to starting it up I would like to know what is the right oil and plug to use. I have downloaded the manuals, but since they are old I can find no real cross reference for the oil or plug listed. I believe the engine is probably original. For oil I am not really sure if I should be using a non detergent oil or not and what weight. And do you have a modern plug you would recommend ? It had a lawnmower plug in it... I live in Florida, so the bike will probably never really see the "cold". I do have spark and fuel so am anxious to ignite it properly and get 'er down the road. Thanks for any help!
     

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