BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
  JWood Auction  
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
Photo posting tutorial

Member Spotlight
Soup Dragon
Soup Dragon
South Cotswolds, England
Posts: 21
Joined: October 2006
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
203 registered members (57nortonmodel77), 1,758 guests, and 538 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Brian Ellery, Jon Andrews, Berni Ernst, johnguppy, michael morgan
9955 Registered Users
Top Posters(30 Days)
btour 186
koan58 99
Stuart 88
NickL 63
Popular Topics(Views)
436,437 mail-order LSR
Forum Statistics
Forums33
Topics65,263
Posts632,026
Members9,955
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate This Thread
#229985 - 12/28/08 1:56 pm Why? Not gettin it...  
Joined: Jun 2007
Posts: 1,636
DPO Offline
BritBike Forum member
DPO  Offline
BritBike Forum member

Joined: Jun 2007
Posts: 1,636
Douglasville (Atlanta) Georgia
My '72 T120 is 90% finished, and runs great. I tickle the Amals, and she always fires right up on the first kick. When I first start her up, I have to constantly "tap" the throttle to keep her idling until she warms. Once out on the open road after awhile, when I stop for a traffic light, the RPM's are now at 2500 or so. Once the engine cools to ambient temps (overnight), I have to tap the throttle to keep her idling. Checked sliders AGAIN..they are dead on the stops (1/4 turn on idle stop screw)..Something to do with engine temp Im thinking...Anyone else have this problem? Very frustrating (Dang it)...Thanks in advance for any guidance.


If you love it, let it go. If it comes back, you've highsided!"

1971 Triumph T120
2005 Triumph "America"
1976 BMW R90/6
Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
#229988 - 12/28/08 2:05 pm Re: Why? Not gettin it... [Re: DPO]  
Joined: Aug 2001
Posts: 6,878
triton thrasher Online content
BritBike Forum member
triton thrasher  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 6,878
scotland
Set idle and all other carb adjustments on a fully warm engine.

It's not meant to idle when cold- how can it?


Amateur Loctite enthusiast.
#229997 - 12/28/08 3:18 pm Re: Why? Not gettin it... [Re: triton thrasher]  
Joined: Aug 2007
Posts: 4,542
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member

Joined: Aug 2007
Posts: 4,542
Kent UK
Sounds like your idle mixture is weak if revs increase as the engine warms up, but you can reckon to help the idle with the throttle a bit when cold anyway.

Blapper redwine

#230048 - 12/28/08 10:57 pm Re: Why? Not gettin it... [Re: triton thrasher]  
Joined: Jun 2007
Posts: 1,636
DPO Offline
BritBike Forum member
DPO  Offline
BritBike Forum member

Joined: Jun 2007
Posts: 1,636
Douglasville (Atlanta) Georgia
Originally Posted By: triton thrasher
Set idle and all other carb adjustments on a fully warm engine.

It's not meant to idle when cold- how can it?


Did that....idle screws all the way out, pilot air screw all the way out, no help..If I turn the pilot air screw in, mixture really leans out...Sounds like a slide problem, but cant pinpoint it...both slides are synched, and slide free....


If you love it, let it go. If it comes back, you've highsided!"

1971 Triumph T120
2005 Triumph "America"
1976 BMW R90/6
#230049 - 12/28/08 11:40 pm Re: Why? Not gettin it... [Re: DPO]  
Joined: Feb 2006
Posts: 589
Florida TR6 Offline
BritBike Forum member
Florida TR6  Offline
BritBike Forum member

Joined: Feb 2006
Posts: 589
Florida
If none of the suggestions above has worked, perhaps the carburetor bores are worn. If there is excessive slop between one or both of the slides and one or both of the carburetor bodies, you'll likely never get it to idle properly. One of our BBF sponsors, Lund Machine, amalsleeve.com, has a great remedy for this. Costs $75 per carb, but what a difference. Mine came back in two weeks. Worth every penny, a new slide alone is about $30 and does not solve the problem of a worn bore. Good luck.


"For every problem, there is a solution that is simple, neat, and wrong." H.L.MENCKEN
'06 T100 Bonneville
'70 TR6 Bitsa, Pazon EI
#230051 - 12/29/08 12:22 am Re: Why? Not gettin it... [Re: Florida TR6]  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
BritBike Forum member
RF Whatley  Online Content
BritBike Forum member

Joined: Oct 2003
Posts: 11,108
North Georgia, USA
Whatley's Second Law of Brit Bikes: A man always buys a Brit bike with one more carburetor than he is capable of tuning.


Tom -
Engine idle is controlled by a lot more than the carb slide...

Condition of the balance tube
Seal of the carb to the intake manifold
Condition of the AAU
Heat range of the spark plug
Grade of fuel

...just to name a few.


bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#230074 - 12/29/08 2:08 am Re: Why? Not gettin it... [Re: RF Whatley]  
Joined: Feb 2006
Posts: 589
Florida TR6 Offline
BritBike Forum member
Florida TR6  Offline
BritBike Forum member

Joined: Feb 2006
Posts: 589
Florida
Richard: My plea (guilty as charged) is mitigated by the Mencken BBF signature I use.


"For every problem, there is a solution that is simple, neat, and wrong." H.L.MENCKEN
'06 T100 Bonneville
'70 TR6 Bitsa, Pazon EI
#230082 - 12/29/08 3:22 am Re: Why? Not gettin it... [Re: Florida TR6]  
Joined: Jan 2008
Posts: 1,113
Jack Adams Offline
BritBike Forum member
Jack Adams  Offline
BritBike Forum member

Joined: Jan 2008
Posts: 1,113
Noblesville, IN
Quote: If I turn the pilot air screw in, mixture really leans out. Say What? Jack

#230116 - 12/29/08 1:35 pm Re: Why? Not gettin it... [Re: Jack Adams]  
Joined: Jun 2007
Posts: 1,636
DPO Offline
BritBike Forum member
DPO  Offline
BritBike Forum member

Joined: Jun 2007
Posts: 1,636
Douglasville (Atlanta) Georgia
Originally Posted By: Jack Adams
Quote: If I turn the pilot air screw in, mixture really leans out. Say What? Jack


Seems to lean out, never really figured out that by turning pilot air screw, if it leans or richens....seems to lean it out, may be wrong. Regardless, this (or either) adjustment will not lower RPM'S below 2500. Makes it hard on the tranny.


If you love it, let it go. If it comes back, you've highsided!"

1971 Triumph T120
2005 Triumph "America"
1976 BMW R90/6
#230123 - 12/29/08 2:53 pm Re: Why? Not gettin it... [Re: DPO]  
Joined: Feb 2008
Posts: 4,047
Tridentman Online content
BritBike Forum member
Tridentman  Online Content

BritBike Forum member

Joined: Feb 2008
Posts: 4,047
New Jersey USA
Air leak carb to manifold? Try sqirting WD40 on joint when idling at 2500 rpm and see if it makes a difference.
HTH

#230132 - 12/29/08 3:25 pm Re: Why? Not gettin it... [Re: Tridentman]  
Joined: Jan 2008
Posts: 1,113
Jack Adams Offline
BritBike Forum member
Jack Adams  Offline
BritBike Forum member

Joined: Jan 2008
Posts: 1,113
Noblesville, IN
O.K. DPO, 2500 rpm takes air, so as TDM is pointing out you may have an air leak,but if not carb to manifold,keep checking every possible connection. Also do you have some slack in the cables so the slide is not being held off of its seat? Are the slides so worn that they are getting cocked in the carb body. Finally, were we not here before? Jack

#230152 - 12/29/08 5:38 pm Re: Why? Not gettin it... [Re: Jack Adams]  
Joined: Jan 2008
Posts: 1,113
Jack Adams Offline
BritBike Forum member
Jack Adams  Offline
BritBike Forum member

Joined: Jan 2008
Posts: 1,113
Noblesville, IN
I thought this sounded familiar, like Oct.21 2008. All I can say is Hey Tridentman, Heeee's Baaack! Watch your legs! Jack

#230166 - 12/29/08 7:08 pm Re: Why? Not gettin it... [Re: Jack Adams]  
Joined: Aug 2007
Posts: 4,542
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member

Joined: Aug 2007
Posts: 4,542
Kent UK
Quote:
My '72 T120 is 90% finished, and runs great.


Then:

Quote:
Seems to lean out, never really figured out that by turning pilot air screw, if it leans or richens....seems to lean it out, may be wrong. Regardless, this (or either) adjustment will not lower RPM'S below 2500. Makes it hard on the tranny.


Aren't those two statements contradictory DP? I'd call that 'runs like sh*t' personally.

Blapper redwine

#230176 - 12/29/08 10:02 pm Re: Why? Not gettin it... [Re: Blapper]  
Joined: Mar 2008
Posts: 143
Bruce Martin Offline
BritBike Forum member
Bruce Martin  Offline
BritBike Forum member

Joined: Mar 2008
Posts: 143
New Brunswick, Canada.
I have found that this problem can be caused by friction in the throttle cables. Is the routing correct without any sharp bends or pinches and are the cables well lubricated?


1937 Ariel Red Hunter 500
1970 Triumph Bonneville

Making the scene with the gasoline
#230192 - 12/29/08 11:33 pm Re: Why? Not gettin it... [Re: Bruce Martin]  
Joined: Oct 2004
Posts: 442
HughdeMann Online content
BritBike Forum member
HughdeMann  Online Content
BritBike Forum member

Joined: Oct 2004
Posts: 442
Beautiful North Carolina
DPO, those are NOT pilot air screws. If they lean the mixture when turned in, the must be idle mixture screws. They control the amount of FUEL flow at idle. Now, before anyone gets prickly about this, remember that to get correct help, you must ask correct questions. Correct questions contain the correct terminology. Now, back to all the responses.


Hugh: Proof the Dodo is not extinct
1964 Bonneville
A couple others
#230215 - 12/30/08 2:04 am Re: Why? Not gettin it... [Re: HughdeMann]  
Joined: Feb 2008
Posts: 4,047
Tridentman Online content
BritBike Forum member
Tridentman  Online Content

BritBike Forum member

Joined: Feb 2008
Posts: 4,047
New Jersey USA
Legs well guarded, Jack!
One question---is this the last DPO saga of 2008 or the first one of 2009----or both?

#230232 - 12/30/08 3:37 am Re: Why? Not gettin it... [Re: Tridentman]  
Joined: Nov 2005
Posts: 7,216
JubeePrince Online content
Life member
JubeePrince  Online Content

Life member

Joined: Nov 2005
Posts: 7,216
Back on the mainland!
Deep -

Sit back, grab a cold one and read through this:

http://www.jba.bc.ca/Bushmans%20Carb%20Tuning.html

It may not cure your ills (the reading that is), but it might help you with your carbs......(AMAL not ale) laughing

HTH,

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#230266 - 12/30/08 1:07 pm Re: Why? Not gettin it... [Re: JubeePrince]  
Joined: Jun 2007
Posts: 1,636
DPO Offline
BritBike Forum member
DPO  Offline
BritBike Forum member

Joined: Jun 2007
Posts: 1,636
Douglasville (Atlanta) Georgia
Thanks Jubee, printed out, great information. You know what? I think it's probably better for me to simply "lurk" and use information on here rather than post anything, as too many instigators trying to redicule everything...Thanks for all the help, those of you that have....No reply's, please.


If you love it, let it go. If it comes back, you've highsided!"

1971 Triumph T120
2005 Triumph "America"
1976 BMW R90/6
#230276 - 12/30/08 2:38 pm Re: Why? Not gettin it... [Re: DPO]  
Joined: Nov 2004
Posts: 1,694
trumpetloon Offline
BritBike Forum member
trumpetloon  Offline
BritBike Forum member

Joined: Nov 2004
Posts: 1,694
georgia
Let's get back to basics for a sec... the carbs are the last thing to eff with when setting up a fresh rebuild. Are you SURE the ignition timing is correct (via timing light not eyeball) for BOTH sets of points? Deductive reasoning leads me to think that since nothing you have done to the fuel system has cured the problem perhaps you don't have a fuel related issue?????? Just thinking out loud here... no disrespect intended.


1974 TR5T
#230443 - 12/31/08 2:50 pm Re: Why? Not gettin it... [Re: Tridentman]  
Joined: Jan 2005
Posts: 1,654
Dick Harris Online content
BritBike Forum member
Dick Harris  Online Content
BritBike Forum member

Joined: Jan 2005
Posts: 1,654
East Bethany New York
I think that our old friend,Jack,is trying to tell you that the screw in question,is called the "airscrew" which in operation,will,as you turn the screw in (clockwise) will decrease the air supply,making the mixture rich. Right Jack,Yuk,yuk Rooster Racing #2

#230489 - 12/31/08 6:04 pm Re: Why? Not gettin it... [Re: Dick Harris]  
Joined: Feb 2008
Posts: 4,047
Tridentman Online content
BritBike Forum member
Tridentman  Online Content

BritBike Forum member

Joined: Feb 2008
Posts: 4,047
New Jersey USA
Happy New Year DPO.
May the New Year bring you plenty of sagas for us to enjoy and you to endure and hopefully succeed.

#230856 - 01/02/09 4:06 pm Re: Why? Not gettin it... [Re: Tridentman]  
Joined: Jun 2007
Posts: 1,636
DPO Offline
BritBike Forum member
DPO  Offline
BritBike Forum member

Joined: Jun 2007
Posts: 1,636
Douglasville (Atlanta) Georgia
Happy New Year to you and yours as well TDM...and you to Hacksaw Adams!!!


If you love it, let it go. If it comes back, you've highsided!"

1971 Triumph T120
2005 Triumph "America"
1976 BMW R90/6

Moderated by  John Healy 


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
UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.104s Queries: 15 (0.006s) Memory: 0.9619 MB (Peak: 1.2705 MB) Zlib disabled. Server Time: 2017-11-20 13:34:59 UTC