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Re: Triumph T120 on going idling issues... [Re: RF Whatley] #220253
10/23/08 11:24 am
10/23/08 11:24 am
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
Yes, lowering the needle position by placing the keeper clip in the upper notch, lowered the idle speed dramatically. Now my idle stop and pilot air screws work like they should...As far as the caps being on "backwards", I think not, as I installed them exactly the way they came off (I marked them, believe it or not). The bike starts and runs so good, I turned the keys over to my 15 year old, who started her on the first kick, and had a blast riding her through our neighborhood...He loves it, and looks forward to riding it to school next year...


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: Triumph T120 on going idling issues... [Re: DPO] #220271
10/23/08 1:20 pm
10/23/08 1:20 pm
Joined: Mar 2005
Posts: 10,175
Boston, Massachusetts
J
John Healy Offline

BritBike Forum member
John Healy  Offline

BritBike Forum member
J
Joined: Mar 2005
Posts: 10,175
Boston, Massachusetts
Quote Tridentman: "b) Putting the slide into the carb body, especially with the carb on the bike and the gas tank in position, is quite difficult to do correctly. It is obviously important to get the needle into the needle jet correctly. What I did once is that the end of the needle, instead of going into the needle jet, caught on the top of the needle jet block and then stayed there as I lowered the slide into the body. The needle clip sort of found its way up the throttle return spring. If DPO had done this then I guess it might explain his 3000 rpm idle speed. Replacing his new needles with his original needles might have nothing to do with using different needles but rather getting the needles into the needle jet properly."

DPO: Raising or lowering the needle position will not increase or decrease your idle to 3,000 rpm. To do this you would also need air, and as the slide is for practical purposes "closed" at idle you would not get the additional air to let the bike reach 3,000 rpm.

What Tridentman describes above is a very common scenario. It is very easy to fail to align the tip of the needle with the needle jet's opening as you offer the slide to the body. If they are not aligned so the needle enters the needle jet the tip of the needle hits the carburetor body and is pushed up into the slide. When this happens the tip of the needle will prevent the slide from closing during normal operation. I cannot tell you how many times I have done this myself in the past 50 years.

Without getting into a long explanation of how this carburetor works, raising or lowering the needle BY ITSELF will not change how fast the motor idles.
John


Re: Triumph T120 on going idling issues... [Re: John Healy] #220318
10/23/08 4:50 pm
10/23/08 4:50 pm
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
Not sure about the vertical position of the needle, all I know is everyting is right, and she runs sweet...Needle is the first thing I watch as I lower the slide into the barrel, to make sure it enters the jet smoothly. The mechanism that stops this particular slide (AMAL 930) is the tab and slot set up. That tab is designed to ride in that slot to a certain point, then stop when the slot ends...Its just that simple. Either way, it's done, and all that's left is decorating the bike with a new paint job, accessories....


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: Triumph T120 on going idling issues... [Re: DPO] #220325
10/23/08 5:09 pm
10/23/08 5:09 pm
Joined: Jan 2008
Posts: 1,114
Noblesville, IN
Jack Adams Offline
BritBike Forum member
Jack Adams  Offline
BritBike Forum member
Joined: Jan 2008
Posts: 1,114
Noblesville, IN
DPO, I must say, you hold on to wrong ideas like a pit bull. Jack

Re: Triumph T120 on going idling issues... [Re: Jack Adams] #220336
10/23/08 5:45 pm
10/23/08 5:45 pm
Joined: Dec 2006
Posts: 3,895
Massachusetts, U.S.A.
B
btour Offline
BritBike Forum member
btour  Offline
BritBike Forum member
B
Joined: Dec 2006
Posts: 3,895
Massachusetts, U.S.A.
Maybe he has unique Amals, or slides. smile


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
Re: Triumph T120 on going idling issues... [Re: btour] #220340
10/23/08 6:00 pm
10/23/08 6:00 pm
Joined: Mar 2005
Posts: 10,175
Boston, Massachusetts
J
John Healy Offline

BritBike Forum member
John Healy  Offline

BritBike Forum member
J
Joined: Mar 2005
Posts: 10,175
Boston, Massachusetts
DPO:

I am sorry, but I read your last comments and you have me in stitches.

Your the guy I want in my fox hole!!!... you just don't give up.
John


Re: Triumph T120 on going idling issues... [Re: John Healy] #220349
10/23/08 6:56 pm
10/23/08 6:56 pm
Joined: Feb 2008
Posts: 4,387
New Jersey USA
Tridentman Offline

BritBike Forum member
Tridentman  Offline

BritBike Forum member
Joined: Feb 2008
Posts: 4,387
New Jersey USA
DPO---it sounds as though you are from the deep south.
Well--when they say "grits with everything" please note that they dont mean pour the grits in the Amals.
As an interesting intellectual exercise try taking off one of the carbs and measuring the slot on the inside of the carb body and see if the slot really stops the slide going down the body.
But be warned ---you might be in for an earth shattering conversion experience.

Re: Triumph T120 on going idling issues... [Re: Tridentman] #220962
10/28/08 10:49 am
10/28/08 10:49 am
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
DPO Offline OP
BritBike Forum member
DPO  Offline OP
BritBike Forum member
Joined: Jun 2007
Posts: 1,649
Douglasville (Atlanta) Georgia
Put 15 or so miles on her through the county....did'nt miss a beat, pulls strong, idles and accelerates sweet...very happy with my $200, er $1300 bike....


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: Triumph T120 on going idling issues... [Re: John Healy] #220971
10/28/08 12:49 pm
10/28/08 12:49 pm
Joined: Aug 2001
Posts: 7,506
scotland
triton thrasher Offline
BritBike Forum member
triton thrasher  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 7,506
scotland
Could the bottom have been filed off the slide, to the extent that it can't reach the base of the choke?


Amateur Loctite enthusiast.
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