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Why? Not gettin it... #229985
12/28/08 1:56 pm
12/28/08 1:56 pm
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
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DPO  Offline OP
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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
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Re: Why? Not gettin it... [Re: DPO] #229988
12/28/08 2:05 pm
12/28/08 2:05 pm
Joined: Aug 2001
Posts: 7,454
scotland
triton thrasher Online content
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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.
Re: Why? Not gettin it... [Re: triton thrasher] #229997
12/28/08 3:18 pm
12/28/08 3:18 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
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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

Re: Why? Not gettin it... [Re: triton thrasher] #230048
12/28/08 10:57 pm
12/28/08 10:57 pm
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
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DPO  Offline OP
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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
Re: Why? Not gettin it... [Re: DPO] #230049
12/28/08 11:40 pm
12/28/08 11:40 pm
Joined: Feb 2006
Posts: 589
Florida
F
Florida TR6 Offline
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F
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
Re: Why? Not gettin it... [Re: Florida TR6] #230051
12/29/08 12:22 am
12/29/08 12:22 am
Joined: Oct 2003
Posts: 11,212
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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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
Re: Why? Not gettin it... [Re: RF Whatley] #230074
12/29/08 2:08 am
12/29/08 2:08 am
Joined: Feb 2006
Posts: 589
Florida
F
Florida TR6 Offline
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F
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
Re: Why? Not gettin it... [Re: Florida TR6] #230082
12/29/08 3:22 am
12/29/08 3:22 am
Joined: Jan 2008
Posts: 1,114
Noblesville, IN
Jack Adams Offline
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Noblesville, IN
Quote: If I turn the pilot air screw in, mixture really leans out. Say What? Jack

Re: Why? Not gettin it... [Re: Jack Adams] #230116
12/29/08 1:35 pm
12/29/08 1:35 pm
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
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DPO  Offline OP
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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
Re: Why? Not gettin it... [Re: DPO] #230123
12/29/08 2:53 pm
12/29/08 2:53 pm
Joined: Feb 2008
Posts: 4,358
New Jersey USA
Tridentman Offline

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Tridentman  Offline

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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

Re: Why? Not gettin it... [Re: Tridentman] #230132
12/29/08 3:25 pm
12/29/08 3:25 pm
Joined: Jan 2008
Posts: 1,114
Noblesville, IN
Jack Adams Offline
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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

Re: Why? Not gettin it... [Re: Jack Adams] #230152
12/29/08 5:38 pm
12/29/08 5:38 pm
Joined: Jan 2008
Posts: 1,114
Noblesville, IN
Jack Adams Offline
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I thought this sounded familiar, like Oct.21 2008. All I can say is Hey Tridentman, Heeee's Baaack! Watch your legs! Jack

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

Re: Why? Not gettin it... [Re: Blapper] #230176
12/29/08 10:02 pm
12/29/08 10:02 pm
Joined: Mar 2008
Posts: 156
New Brunswick, Canada.
Bruce Martin Offline
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Bruce Martin  Offline
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Posts: 156
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
Re: Why? Not gettin it... [Re: Bruce Martin] #230192
12/29/08 11:33 pm
12/29/08 11:33 pm
Joined: Oct 2004
Posts: 461
Beautiful North Carolina
HughdeMann Offline
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HughdeMann  Offline
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Posts: 461
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
Re: Why? Not gettin it... [Re: HughdeMann] #230215
12/30/08 2:04 am
12/30/08 2:04 am
Joined: Feb 2008
Posts: 4,358
New Jersey USA
Tridentman Offline

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Tridentman  Offline

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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?

Re: Why? Not gettin it... [Re: Tridentman] #230232
12/30/08 3:37 am
12/30/08 3:37 am
Joined: Nov 2005
Posts: 7,406
Back on the mainland!
JubeePrince Offline

Life member
JubeePrince  Offline

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Posts: 7,406
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...
Re: Why? Not gettin it... [Re: JubeePrince] #230266
12/30/08 1:07 pm
12/30/08 1:07 pm
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
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Posts: 1,649
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
Re: Why? Not gettin it... [Re: DPO] #230276
12/30/08 2:38 pm
12/30/08 2:38 pm
Joined: Nov 2004
Posts: 1,694
georgia
T
trumpetloon Offline
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trumpetloon  Offline
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T
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
Re: Why? Not gettin it... [Re: Tridentman] #230443
12/31/08 2:50 pm
12/31/08 2:50 pm
Joined: Jan 2005
Posts: 1,662
East Bethany New York
Dick Harris Offline
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Dick Harris  Offline
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Posts: 1,662
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

Re: Why? Not gettin it... [Re: Dick Harris] #230489
12/31/08 6:04 pm
12/31/08 6:04 pm
Joined: Feb 2008
Posts: 4,358
New Jersey USA
Tridentman Offline

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Tridentman  Offline

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Posts: 4,358
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.

Re: Why? Not gettin it... [Re: Tridentman] #230856
01/02/09 4:06 pm
01/02/09 4:06 pm
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
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DPO  Offline OP
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Posts: 1,649
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

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