BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
Jwood & co JRC Engineering dealers Jwood & co
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
Tim Lynch
Tim Lynch
Devon, UK
Posts: 129
Joined: September 2008
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
34 registered members (Bob E), 217 guests, and 473 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Trondgv, Jonathan Ytterli, hunterjim00, Gary J, SpeedTwin38
10329 Registered Users
Top Posters(30 Days)
Stuart 125
reverb 86
Lannis 61
Popular Topics(Views)
657,506 mail-order LSR
Forum Statistics
Forums34
Topics67,664
Posts657,308
Members10,329
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Commando Idle #711098
10/10/17 2:12 pm
10/10/17 2:12 pm
Joined: Jul 2006
Posts: 468
just a guy from Jersey [Hopewe...
N
nert Offline OP
BritBike Forum member
nert  Offline OP
BritBike Forum member
N
Joined: Jul 2006
Posts: 468
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
Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: Commando Idle [Re: nert] #711104
10/10/17 3:28 pm
10/10/17 3:28 pm
Joined: Mar 2006
Posts: 3,728
Norfolk, UK
L.A.B. Offline
BritBike Forum member
L.A.B.  Offline
BritBike Forum member
Joined: Mar 2006
Posts: 3,728
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: 468
just a guy from Jersey [Hopewe...
N
nert Offline OP
BritBike Forum member
nert  Offline OP
BritBike Forum member
N
Joined: Jul 2006
Posts: 468
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: 1,402
New Zealand
J
johnm Offline
BritBike Forum member
johnm  Offline
BritBike Forum member
J
Joined: Apr 2006
Posts: 1,402
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: 3,728
Norfolk, UK
L.A.B. Offline
BritBike Forum member
L.A.B.  Offline
BritBike Forum member
Joined: Mar 2006
Posts: 3,728
Norfolk, UK
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: 9,430
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,430
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: 548
belgium
ludwig Offline
BritBike Forum member
ludwig  Offline
BritBike Forum member
Joined: Sep 2002
Posts: 548
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: 468
just a guy from Jersey [Hopewe...
N
nert Offline OP
BritBike Forum member
nert  Offline OP
BritBike Forum member
N
Joined: Jul 2006
Posts: 468
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: 548
belgium
ludwig Offline
BritBike Forum member
ludwig  Offline
BritBike Forum member
Joined: Sep 2002
Posts: 548
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
BritBike Forum member
Simon Ratcliff  Offline
BritBike Forum member
S
Joined: Apr 2015
Posts: 114
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: 1,196
Bolton Lancs UK
A
Andy Higham Offline
BritBike Forum member
Andy Higham  Offline
BritBike Forum member
A
Joined: Aug 2015
Posts: 1,196
Bolton Lancs UK
This flies in the face of those willy wavers who pride themselves in the slowest possible idle speed


1955 BSA B31 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
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
BritBike Forum member
Simon Ratcliff  Offline
BritBike Forum member
S
Joined: Apr 2015
Posts: 114
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: 1,196
Bolton Lancs UK
A
Andy Higham Offline
BritBike Forum member
Andy Higham  Offline
BritBike Forum member
A
Joined: Aug 2015
Posts: 1,196
Bolton Lancs UK
Nowt worse than an ultra low idle. Pull clutch in, put in gear and the bugger stops


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

Moderated by  Dave Comeau 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1