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kcameronSat Mar-07-09 01:15 PM
Member since Mar 18th 2009
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"Gettting my '62 Atlas ready for spring"


  

          


So with quite a bit of help from a local shop I got my father-in-laws '62 Atlas on the road last fall. Unfortunately the shop closed up at the end of the season so a few lingering things needs to be addressed.

My mechanical skills are weaker than most on the forum but I'm not afraid to get my hands dirty.

Here is what I need to do:

1) The tickler vibrated off, but that looks pretty easy to replace. I can start the bike fine without it.

2) The throttle cable needs an adjustment, it almost appears like the cable it too long. I know I can make an adjustment on the carb but it looks to me like the cable has stretched a full 1/2 inch, which seems like more than I can adjust on the carb. The cable actually falls out of the throttle. Do I need to replace it? The first time I started it I had to kill the engine immedately as the engine raced because the throttle was not returning to a closed position.

3) I have exactly the same situation with the clutch cable. When I started the bike this morning I was going, I put it into gear and it stalled immediately. It took me a minute to realize the cluch handle was not returning to the normal position. There is significant play in the cable. The adjustment seem to be already out at the max.

Any suggestions on the throttle and clutch cables and adjustments?

Thanks

Kirk

  

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dynodaveMon Mar-09-09 07:35 PM
Member since Mar 18th 2009
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#1. "RE: Gettting my '62 Atlas ready for spring"
In response to Reply # 0


  

          

62's had monobloc's. often only 1
I think 63, like my atlas, all came with 2 carbs.
Do you have monobloc or concentric carb?
Why ? different carbs have inner/outer cable free lengths.
The cable is likely the wrong free length. If it was right the throttle ferrule would not fall out.

If you can solder then you can probably fix it.

I buy any generic long cables and make them up myself to order.

I have also recieved genuine norton packaged cable that was to short and would idle at 3000rpm because the slide would not shut.

  

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kcameronWed Mar-11-09 08:25 AM
Member since Mar 18th 2009
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#2. "RE: Gettting my '62 Atlas ready for spring"
In response to Reply # 1


  

          

Thanks Dave,

Definitely only 1 carb and I'm pretty sure it is a monobloc. I'm not in front of the bike now but I know the mixing chamber cap has ridges on the side, and a spring on top which I think means it is a monobloc. I'll confirm when I get home.

The only thing confusing about the cables is the bike ran fine all fall. I probably put 300-400 miles on it, the throttle was fine, and the clutch was fine. So I would have thought the cables were the right length. I started the bike several time over the winter without problems and noticed the throttle situation in January.

On a separate topic is the NENO meeting happening this week end as scheduled? I live in Maine and have been meaning to drive down to one.

Kirk

  

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dynodaveThu Mar-12-09 12:22 PM
Member since Mar 18th 2009
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#3. "RE: Gettting my '62 Atlas ready for spring"
In response to Reply # 2


  

          

Yes the NENO meeting is always the 2nd saturday of the month.
2:00pm at the loaf and ladle.
http://nneno.org/
you may have a gummed up carb if it was OK on the existing cable.
If you tweeked the carb mounting nuts at all... then you may have warped the body just enough to pinch the slide. There should not be a gasket but only an o-ring. But you can still warp the body either way.
Clutch cable?
Have you ever removed the cables and gravity fed oil through them?
They may be rusting and starting to seize....
Dave

  

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kcameronSun Mar-15-09 10:01 AM
Member since Mar 18th 2009
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#4. "RE: Gettting my '62 Atlas ready for spring"
In response to Reply # 3


  

          

Thanks Dave,

I wish I could have made it to the NENO meeting yesterday maybe next month, so many kids activities.....

The carb setup is a single amal monobloc 389. I think you are correct that the carb must be gummed up. The cable moves freely but it feels like the throttle valve spring is closing the throttle. I can get the bike to start but cannot get it to idle, the engine races so I have to shut it down.

I also noticed a drop of oil on the bottom of the main jet cover. The bike definitely leaked oil over the winter, I guess this is the wet sumping I've read about on other threads.

Also when I was looking at the carb more closely I can see that the velocity tube is missing. So now I'm missing two parts as the tickler is also missing. Could both really have vibrated off last fall when I was riding?

How reasonable is it for a beginner to dismantle and clean the carb? Any tips?

I have the 1960 and the 1962 Maintenance Manual and Instruction Book. (My father in law kept everything, I even have a personal letter from Norton answering some of his questions). I do find it interesting that the manuals do not specifically cover a 1962 750 Atlas and am wondering if that is because they didn't sell that model in the UK until '63. The cover pages specifically say that it covers models: 88, 99, ES2, 50, 650 and Sport Specials.

Kirk

  

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