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Commando Idle #711098
10/10/17 2:12 pm
10/10/17 2:12 pm
Joined: Jul 2006
Posts: 466
just a guy from Jersey [Hopewe...
N
nert Offline OP
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nert  Offline OP
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just a guy from Jersey [Hopewe...
I've looked in the owners manual, and service book. I could be missing it, but I don't see a recommended rpm for a 73' 850 Commando.
Any one know, or where is it stated?
thanks


keep your "oddies" lubricated, and carry a dime
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Re: Commando Idle [Re: nert] #711104
10/10/17 3:28 pm
10/10/17 3:28 pm
Joined: Mar 2006
Posts: 3,479
Norfolk, UK
L.A.B. Online content
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Posts: 3,479
Norfolk, UK
Originally Posted by nert
I've looked in the owners manual, and service book. I could be missing it, but I don't see a recommended rpm for a 73' 850 Commando.


There wasn't a factory recommended idle speed.

Re: Commando Idle [Re: L.A.B.] #711105
10/10/17 3:34 pm
10/10/17 3:34 pm
Joined: Jul 2006
Posts: 466
just a guy from Jersey [Hopewe...
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nert Offline OP
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nert  Offline OP
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just a guy from Jersey [Hopewe...
What do you all set your Norton Commando "tick over speed", with twin carbs at??


keep your "oddies" lubricated, and carry a dime
Re: Commando Idle [Re: nert] #711107
10/10/17 3:52 pm
10/10/17 3:52 pm
Joined: Apr 2006
Posts: 1,397
New Zealand
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johnm Offline
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New Zealand
Right or wrong I have never set any of my bikes to idle.

I always set them so they cut out unless there is a little weight on the throttle.

You should never let a Commando idle on start up because it kills the camshaft.

And once it is running I always found it safer to keep my hand on the throttle keeping the bike alive and ready to get out of the way of the idiot behind me who wasn't stopping fast enough at the lights.

It's worked for 49 years :-)

Re: Commando Idle [Re: nert] #711108
10/10/17 3:57 pm
10/10/17 3:57 pm
Joined: Mar 2006
Posts: 3,479
Norfolk, UK
L.A.B. Online content
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Originally Posted by nert
What do you all set your Norton Commando "tick over speed", with twin carbs at??


Approximately 1000 RPM, with the engine fully warmed up.

Re: Commando Idle [Re: nert] #711156
10/10/17 10:21 pm
10/10/17 10:21 pm
Joined: Dec 2004
Posts: 9,082
Scotland
kommando Online content
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Scotland
Go with 1000 and ride it, if it keeps running then leave it, if it stops as you pull up to lights try 1100 but more likely you just need to find the idle mixture for best running.

Re: Commando Idle [Re: nert] #711212
10/11/17 4:55 pm
10/11/17 4:55 pm
Joined: Sep 2002
Posts: 501
belgium
ludwig Offline
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belgium
I set it at 1200 - 1300 rpm , but avoid idling if I can ..

Re: Commando Idle [Re: ludwig] #711216
10/11/17 5:08 pm
10/11/17 5:08 pm
Joined: Jul 2006
Posts: 466
just a guy from Jersey [Hopewe...
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nert Offline OP
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nert  Offline OP
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just a guy from Jersey [Hopewe...
That is where mine is currently, 1200-1300. What is this taboo about idling? I have not heard that.


keep your "oddies" lubricated, and carry a dime
Re: Commando Idle [Re: nert] #711236
10/11/17 8:32 pm
10/11/17 8:32 pm
Joined: Sep 2002
Posts: 501
belgium
ludwig Offline
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belgium
It is generally accepted that ( lubrication of ) the camshaft is one of the weaker points in a Norton engine .
It does not like low rpm and prolonged idling ..

Re: Commando Idle [Re: nert] #712974
10/28/17 8:43 am
10/28/17 8:43 am
Joined: Apr 2015
Posts: 114
Wolverhampton, U.K
S
Simon Ratcliff Offline
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Wolverhampton, U.K
As has been mentioned it's vital to generate sufficient oil pressure at all engine speeds hence the importance of correct calibration of the pressure relief valve. A good pump should produce approx. 20psi at idle with a hot engine. I know M Hemmings and others recommend shimming the valve so it rattles when shaken. This method tells you absolutely nothing about what pressure the valve opens at. Connecting a pressure gauge is the only way to establish prv opening pressure which should be between 45 and 55psi. engine hot.

Last edited by Simon Ratcliff; 10/28/17 8:49 am.

Norton Mk3 Commando.
Re: Commando Idle [Re: nert] #713031
10/28/17 9:14 pm
10/28/17 9:14 pm
Joined: Aug 2015
Posts: 1,011
Bolton Lancs UK
A
Andy Higham Online content
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Bolton Lancs UK
This flies in the face of those willy wavers who pride themselves in the slowest possible idle speed


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc grasstrack
2003 Aprilia RSV Mille "Lo Stregone"
Re: Commando Idle [Re: nert] #713064
10/29/17 11:08 am
10/29/17 11:08 am
Joined: Apr 2015
Posts: 114
Wolverhampton, U.K
S
Simon Ratcliff Offline
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Wolverhampton, U.K
Yeah, I agree. The priority is high enough engine idle speed to generate sufficient oil pressure. The cams will then get enough lubrication from the oil spraying out of the con rod journals in addition to oil draining down the pushrod tunnels. Obviously if the pump is struggling to generate sufficient pressure at tickover then the lubrication system needs looking at.


Norton Mk3 Commando.
Re: Commando Idle [Re: nert] #713069
10/29/17 11:57 am
10/29/17 11:57 am
Joined: Aug 2015
Posts: 1,011
Bolton Lancs UK
A
Andy Higham Online content
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Posts: 1,011
Bolton Lancs UK
Nowt worse than an ultra low idle. Pull clutch in, put in gear and the bugger stops


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc grasstrack
2003 Aprilia RSV Mille "Lo Stregone"

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