Control Cable Routing

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Hello, I am new to this forum, and also to Norton motorcycles. I have owned three Tri & 2 HD over the years, but now I am the proud, new, third owner of a 1975 MKIII Commando Roadster. I have many questions, but hopefully I will find the answers as time goes by, probably through reading the wealth of information in this forum.

My biggest question right now concerns control cable routing. I can’t seem to find this information anywhere. When I turn the handle bars to the right, it revs to about 2500 rpm from idle. Not good.

I would like to straighten out the messy clutch; choke, and throttle cable routing of the previous owner. Presently the clutch cable is running through the dashboard console (next to the brake line), I believe this wrong. The choke is going straight under the tank from the left handlebar, (I think this should be going through the dashboard console, from the right handlebar). The throttle cable is going in front of the right fork tube, under the headlight bracket. Either that is wrong or someone used a short cable, but wouldn't that affect left turns?

So if anyone could possibly point me in the right direction, I would be very grateful. Thanks.
 

JD

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Jun 1, 2007
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Hello 2wheels-
I have a MK3 Norton Commando as well. Concerning your left hand turn issue: check to see where the barrel coupling is located for the upper throttle cable to the lower 2 (assuming you have a stock set-up). I have seen a time or two where they have lodged or gotten kinked between the frame and underside of the tank or head steady. Obviously pulling or pushing in one direction may favor an unexpected jump in rpms. Not so fun when you dont expect it during slow speeds. The other thing to look for, and you did mention it, make sure you have the correct throttle assembly. Your MK3 should have that integrated into the electric start switch. When I bought my MK3, it had the 74 and prior style switches and a separate throttle housing. Check to see also that your cables are adjusted correctly. There are 2 halves to your upper throttle cable. Ensure that the adjustment hasnt been run all the way up, taking up any needed slack in the system. You'd be able to tell right away, as there should be a bit of free-play before the throttle actuates, and a nice crisp snap when it closes unassisted. As far as cable routing is concerned, I have my throttle cable routed just over the right headlamp ear and down towards the carbs. My clutch cable is routed, as yours is, through the console and top clamp opening and down the right side. It has a bit of slack as it follows under the tank. Then it dives down just behind the battery tray where the accessory plug is located and into the transmission. I have the lower "euro" style bars and everything looks very tidy and works as it should. Weather or not it is totally correct, that may be another issue. Enjoy your bike. Out of all of 'em, my Norton is my favorite. Cheers.
JD
 
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