Atlas Questions

One of the issues I find with a lot of Italian bukes is that they rarely use captive nuts like Japanese bikes do. On occasions like you describe, I've been known to dismantle the entire assembly just so I can weld a captive nut somewhere that needs it, so as to make it less of a struggle next time it needs to come apart. That's one of the reasons I prefer not to have a powder coated frame. PC is not so easy to touch up after welding something to it.
 
Dellortoman said:
One of the issues I find with a lot of Italian bukes is that they rarely use captive nuts like Japanese bikes do. On occasions like you describe, I've been known to dismantle the entire assembly just so I can weld a captive nut somewhere that needs it, so as to make it less of a struggle next time it needs to come apart. That's one of the reasons I prefer not to have a powder coated frame. PC is not so easy to touch up after welding something to it.
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You’re right Cam, those Japs had lots of time saving tricks for assembling, such as captive nuts. And even on fairings they used wobbly captive nuts so the bodywork could be lined up, then tightened.
 
chrisk said:
You’re right Cam, those Japs had lots of time saving tricks for assembling, such as captive nuts. And even on fairings they used wobbly captive nuts so the bodywork could be lined up, then tightened.
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Maybe, but it still took the best part of the day to change the plugs on an early CBR600!
 
It does have captured nuts on the regular bits that come off a lot like side covers and seat, But it's incredibly busy behind the headlight with brake lines clutch cable instruments and their cables plus the horn all mounted really close together using the same 2 bolts holding just about it all. It took a while just to see where to start. It will be easier next time for sure.
 
well my Chevvy truck (5.7 litre centre point injected V8) did 60,000 miles on what I am fairly sure where the original plugs, externally they were very rusty and I was fearfull that I might not get them all out, but I did, starting and power was restored with new NGK equivalent plugs, I can't recall the make, but almost unheard of here in UK, they may have been Lodge, or perhaps AC
CLEM
 
Plugs for modern fuel-injected car engines often have a 100,000km renewal interval. Due to the sky-high revs that most bikes manage, reckon they'd be good for 50,000... not many new bikes do that anymore before they're trashed or traded.

piet
 
Paul Marx said:
That's because changing plugs isn't part of the design brief.
It's assumed that the thing will be thrown out and replaced long before.

Paul
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CBR600 has to be one of the most reliable bulletproof motors ever, tolerate almost anything you can inflict on them as long as you stay near the extremely long service intervals. They certainly don't "eat" spark plugs so ease of servicing them not needed in the design brief.
 
Another heat-soaked day in my tin torture chamber with another small win or 2. I found where those small metal tubes go, the instrument come dash is plastic and these are crush protectors that drop out when you move it. The nuts on these were just as painful as the horn nut needing a greasy finger and tube spanner on the other end as you line up 3 things that are held on with these nuts and bolts. So I got it going again but it sounded like it was running on one cylinder for a while warming up slightly popping, that stopped and it would take throttle while in neutral. So I tried riding it into that torture shed, it's a bit like a beginner TRIALS section but it wouldn't power on. Time to try this with added choke and that got it moving promptly confirming it's as lean as a Biafran in a Drought. So the next major step is getting it jetted up when the suppliers open after Christmas. These Dual Throat Delordoes take very different jets to other Dels.BTW the horn still works, most of the time.
 
This may not help your confidence Vince, but I Had a Z900 with twin dual throat Dellortos on it. Nobody, repeat nobody, wanted to go near them when it came time to tune.

The best it ever ran was after the local car carby fix it guy (he did a lot of twin Webers back then) had a play.

I doubt that even our resident Dellorto Whisperer would.
 
That's the challenge Chris, he has done some amazing fitments to different carbs including Flat Side Kehians, their non-rattling slides make me very jealous. We had a chat and he mentioned Emulsion tubes and that if you change jets you should also change emulsion tubes to suit as to Quote They work Hand in Glove, and then he sends me a pic of approx 20 Emulsion tubes with progressive-size changers. Anyway, the only place as mentioned that I can find in Oz with jets is closed to the 11th Jan. I just hope I can convince him to give it a go. Weather permitting I will try another lap of the block with the choke on tomorrow and see for sure how it proceeds.
 
Just to add to the fun, it took me an hour and a half to bolt the bloody seat on this afternoon. It's only 2 bloody bolts. Its captured nuts also hold the rear subframe and rack on and it was misaligned by a couple of mm needing the exhaust and subframe fixings loosen and banged into place and the plastic seat hole widened with a file. And once fitted you tighten it all up and hope it stays aligned. No bloody wonder bike shops charge a lot.
 
I’m now starting to question my sanity in buying another to replace the one I sold Vince. 🤔
At least it has Mikunis fitted and not the dreaded Dellorto...
 
Ha, Andy, I hope that the first start and ride vid I sent you wasn't as big as I think it might be. I know nothing other than pressing buttons with my fingers crossed.
 
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