Newbie needs pictures.... pretty please?

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Hey all, several months ago I picked up a bunch of boxes of parts that will eventually become a Commando. It's now halfway to resembling a motorcycle but I could really use some visual aids... Being as though I didn't actually disassemble any of it, there's only so much I can piece together from the parts diagrams and the various random pictures all over the internet.
One picture I can't find though is where the horn is mounted. I'm assuming it's under/around the battery tray judging by the parts diagram but I have yet to see an actual picture of it in place. Does anybody have a decent shot of this?
Also if anybody has good closeups of the oil tank/filter/breather routing (mine's a '73 750) those would be muchly appreciated as well...
 

L.A.B.

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Scheffy.G said:
One picture I can't find though is where the horn is mounted. I'm assuming it's under/around the battery tray judging by the parts diagram but I have yet to see an actual picture of it in place. Does anybody have a decent shot of this?

Welcome, Scheffy.G

Photograph it? You can hardly see it! But the horn is connected to the underside of the battery tray (by a triangular bracket).

This may help?: http://rocbo.lautre.net/technique/norto ... p/147.html

---------------------------------------------
Oil line info: http://www.oldbritts.com/oillines.html
 
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:D Nobody has a decent picture of the horn in situ because you can hardly see it, much less get to the blasted thing !

The bracket which fixes to the horn has two holes which fit to the battery carrier at the lower rear mudguard mount. The horn is positioned below the tray. It is a tight squeeze and you may find that you have to play around with spacers a little to get it to sit nicely, depending on the mudguard and the battery tray.

Do you have any particular points you need clarifying on the oil lines ? Be VERY careful if you are working from the 1972 parts book (063402) as '72 was the first year with the filter and for some reason the artist shows the filter on the feed side ! This is incorrect. It should be on the return side. They further complicated things by labelling the return as the feed and although the drawing was corrected for 1973, the mis-labelling wasn't !

Most owners blank off the chain oiler which was fitted from a "tee" on the return.

The breathing is a bit dependant on what sort of air filtration you intend to use.
 

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It might be worth mentioning that the two bolts that secure the horn bracket to the battery tray also serve as the rear mudguard (fender) front lower mountings.
The horn bracket is secured to the battery tray with a nut and washer on each bolt so that the two bolt shanks face rearwards, then the mudguard is fitted onto the protruding bolt threads, and secured with nuts and washers.

This is not always apparent from the parts drawings, as the horn and mudguard fittings are not shown together, the horn assembly is also shown facing the wrong way around in relation to the frame in the parts book diagram which doesn't help!
 
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That was exactly what I was looking for with the horn - thanks a million, guys. Good to know about the thru-bolting of the bracket/fender - would have never gotten that off any pictures...

As for the oil lines, I'll have to double-check the return/feed routing once I get home. The manual I'm using has MkIII stuff in it and the diagram that's in there is the same as the one on the Old Britts site (http://www.oldbritts.com/oillines.html) so I'm assuming it's a later/corrected version?
I'll also be running a single 34mm Amal MkII so I'll probably be running that breather to a catch bottle. I'm just not sure what to do with the big, main engine breather hose. Pretty much all the pictures I've seen are the proper MKIII designs and, mine being the shady '73 design running off the bottom rear of the motor, it leaves a little uncertainty as to where to route that huge hose. I'm thinking it doesn't matter much as long as it's connected properly and not running along something that obviously wouldn't tolerate the heat very well, but i might as well get it routed right while everything's apart and relatively easy to get at.
 

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Yes, the breather arrangement for a '73 750 should be the same as the '72 models, coming off the lower rear part of the crankcase, and not like the 73-on 850 type shown in the diagram with the pipe coming off the inside rear of the timing chest, but the layout of the oil lines should be the same.
 
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Hello Scheffy.G,
I'm sorry to have to tell you this.
When Norton were building Commandos on the production the first item they started with was the horn, the rest of the bike was then built around it.
I hope you haven't wasted your time and have to start again.:wink:

Cash
 
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When Norton were building Commandos on the production the first item they started with was the horn, the rest of the bike was then built around it.

Cash

Is that why ~ promptly after my Commando was restored and cleared for roadworthy~ the horn failed before all or any thing else ??

:lol: :lol:

AND it was the first item I binned ~ when I had to remove the gearbox !! twelve months later ~ *now has a Jappa horn hidden under the seat! )
 
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