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#486733 - 04/21/13 2:41 pm wont stay at steady idle t140  
Joined: Apr 2011
Posts: 155
brian begg Offline
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brian begg  Offline
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Posts: 155
united kingdom
set the idle on my t140 its okay then as soon as i rev it up the tickover rises up .the cable seem okay carbs cleaned out in ultra sonic tank .what is the correct revs for the tickover. maybe i am going to low. no rev counter on my bike but can get a lend of a digital one to set it. all standard jets, needle set in the second groove AMAL 900 carbs on it with bell mouths cheers for any help

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#486734 - 04/21/13 3:02 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Jul 2009
Posts: 3,549
Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance

Joined: Jul 2009
Posts: 3,549
Vic. Australia
What ignition system?

#486737 - 04/21/13 3:08 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Apr 2011
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brian begg Offline
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brian begg  Offline
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united kingdom
new pazon set up no battery all new parts ,done the same with the Boyer that was fitted before

#486762 - 04/21/13 3:56 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Sep 2005
Posts: 1,997
T140V-Rich Offline
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T140V-Rich  Offline

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Sunny South Carolina, (US)
Just a reminder, probably preaching to the choir, but the tickover was set whilst the engine was warm? Ridden 5-10 miles first?

Cheers

Richard


1977 T-140V
1973 T-140V
2011 Bonneville SE
Author of "Relics and Reminiscing."
#486763 - 04/21/13 3:56 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Nov 2005
Posts: 7,213
JubeePrince Online content
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JubeePrince  Online Content

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Back on the mainland!
Hi Brian,

You may want to start checking the manifold(s)for air leaks.....can we assume you set up and synced the cables correctly?

Steve


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

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#486772 - 04/21/13 4:21 pm Re: wont stay at steady idle t140 [Re: JubeePrince]  
Joined: Apr 2011
Posts: 155
brian begg Offline
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brian begg  Offline
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Posts: 155
united kingdom
yes set it all up going by bushmans carb set up

#486795 - 04/21/13 9:04 pm Re: wont stay at steady idle t140 [Re: brian begg]  
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Back on the mainland!
Hi Brian,

Not sure if Bushmans still advocates syncing with WOT, but here's a small blurb about syncing from John Healy:

In my youth I figured it was best to start throttle cable adjustment at full throttle just like Bushman recommends. My logic, driven by what have been a youthful bursts of testosterone, demanded it. Often we were fresh from the pages of Irving's "Tuning for Speed" and wanted all from our engines.

Then one day watching a competitor at the track adjust his cables it hit me: It was all about "percentage of error," and you wanted the error where it made the least difference.

If there is going to be any error in how the cables lift the slide you want it where it has the least effect. That is at wide open throttle. Bushman's system insures that if there is a problem it will be where it will have the greatest effect upon the percentage of error (POE), and thus effect upon how the carburetor operates: Low throttle openings.

Any error in slide movement, or height, will have the greatest effect upon carburetor performance at low throttle openings. So it is better to start from the bottom, and let any error be at or near full throttle where any slight difference in height will have the least effect upon the POE.

1. Unscrew the throttle stops so they allow the slide to hit the bottom of the carburetor body.
2. Using the two cable adjusters get both slides to lift off the bottom of the bottom of the body at exactly the same time when you open the throttle. When you let go of the throttle you should here a single click. Not click, click!!
3. Place a finger on the side of the slide through the venturi and turn the throttle stop until you JUST feel it lifting the slide. Then turn the throttle stop screw in 3/4's of a turn. Do the same to the other carburetor.
4. Double check that both cables have a bit of free play so that the throttle turns a bit before it starts to lift the slides (important!!).
5. Set the pilot air screw at 1 1/2 turns out.
6. Make final adjustments making small (1/8 turn) adjustments EQUALLY to each throttle stop. When you open the throttle and let the slides drop you should only hear a single click... again not click,click.
7. While the throttle stop adjustments should end up even, there can be slight variations in the final setting of the pilot air screws.

And when both sides of the motor are pulling equally at low to medium throttle openings it will seem to vibrate less!

Now you have adjusted out any variations at low throttle openings and moved any variations in cable routing or number of bends in each cable to larger throttle openings where any variant will be a much smaller POE. And at WFO the slides are out of the venturi and have no effect on all this.

Or you could use a 2 into 1 cable arrangement and have fewer problems!


Steve


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

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#486797 - 04/21/13 9:29 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Jul 2009
Posts: 3,549
Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance

Joined: Jul 2009
Posts: 3,549
Vic. Australia
Check the keyways in the slide bores,for any steps where the slide could catch.
Make sure the throttle springs aren't twisting the slide,and the carb tops go on without twisting the spring.

#486899 - 04/22/13 4:10 pm Re: wont stay at steady idle t140 [Re: Pete R - R.I.P.]  
Joined: Apr 2011
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brian begg Offline
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brian begg  Offline
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Posts: 155
united kingdom
cheers for all the ideas will try them most apreciated

#487065 - 04/23/13 3:07 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Apr 2011
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brian begg Offline
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brian begg  Offline
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united kingdom
what should the revs be at tick over still getting the same problem ,maybe i am going to low . also my rear discbrake does not feel rite should there be a lot of travel on the pedal or should you just have to dab the pedal cheers again for any help

#487075 - 04/23/13 3:43 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Mar 2006
Posts: 1,160
htown Online content
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htown  Online Content
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Magnolia, TX
These things don't need to idle like a Harley, 1000-1100 is where I usually shoot for when engine is fully warmed up.
Probably need to partially withdraw the axle bolt so the rear caliper hangs down with the bleed nipple in the highest possible position. Then bleed brake. Will need to remove left muffler to get axle out.
IMHO the t140 rear brake system is one of the most f'd up designs in motorcycle history. I'm struggling with mine right now. I'm going to have to do a large paint touch up from spilled brake fluid.

Last edited by htown; 04/23/13 3:45 pm.

1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
2-1974 Norton Commandos
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
#487076 - 04/23/13 3:52 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Nov 2005
Posts: 7,213
JubeePrince Online content
Life member
JubeePrince  Online Content

Life member

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Posts: 7,213
Back on the mainland!
Originally Posted By: brian begg
my rear discbrake does not feel rite should there be a lot of travel on the pedal or should you just have to dab the pedal cheers again for any help


http://classicbike.biz/Triumph/Maintenan...umph_Norton.pdf

Steve


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

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#487252 - 04/24/13 4:27 pm Re: wont stay at steady idle t140 [Re: brian begg]  
Joined: Jun 2007
Posts: 144
lrutt Offline
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lrutt  Offline
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Joined: Jun 2007
Posts: 144
Deltona, FL
I know on Nortons the typical problem with inconsisten idle is worn slides. Does the same occur on Triumphs?

I know last year I replaced ALL my old worn AMAL slides with the new hard anodized slides. It definatly improved my Norton and the action is smoother on my Trophy. Could not tell a difference on the tiger though.

Any air leak around a worn slide will give wonky idle. tell tale sign is to just barely take up the slack on the throttle and you can actually detect an idle dip before it will start to pick up.


1970 Tiger
1971 Trophy
1973 Commando
1976 CB750k
1965 CA77
1978 CB750k
1970 T250II
1971 RT1B
1977 Lemans
2001 M900
2001 XR650L
1994 FLSTC
2006 XL1200C
1984 XV1000
1981 C70
1973 Z50
1989 Hawk GT
2006 Scrambler
1970 CT90
1965 CT200
1977 R75/7

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