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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 07-29-2009, 08:06 PM   #1 (permalink)
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Idle Mixture Screw/Pilot Screw

Are the idle mixture screw and the pilot screw the same thing? The reason I'm asking is on the recommendation of Marc I made some small adjustments to my pilot screws, which really helped. It was a pain in the neck getting the "d" shaped tool in there to adjust them, and I remembered that New Bonnieville advertised idle mixture screws to replace the "D" screws. But on the America, the pilot screw is in a very tight location, and the knurled head of the screws advertised at New Bonnieville look like they would be too big to fit into the space available (because of the electrical connectors right next to them).

Question # 1. Are these the same screw?

Question # 2. If they are, has anyone purchased the idle adjustment screws advertised at New Bonnieville for an 08 America? and if so, do you have enough room to install them and use them to make adjustments.
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Old 07-29-2009, 08:58 PM   #2 (permalink)
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Originally Posted by skromfols View Post
Are the idle mixture screw and the pilot screw the same thing? The reason I'm asking is on the recommendation of Marc I made some small adjustments to my pilot screws, which really helped. It was a pain in the neck getting the "d" shaped tool in there to adjust them, and I remembered that New Bonnieville advertised idle mixture screws to replace the "D" screws. But on the America, the pilot screw is in a very tight location, and the knurled head of the screws advertised at New Bonnieville look like they would be too big to fit into the space available (because of the electrical connectors right next to them).

Question # 1. Are these the same screw?

Question # 2. If they are, has anyone purchased the idle adjustment screws advertised at New Bonnieville for an 08 America? and if so, do you have enough room to install them and use them to make adjustments.

no they are not the same thing. You do not "adjust" the pilot screw, you screw it in all the way. the D shaped tool you used was on you idle mixture screw. I have the hand screws from newbonneville and they fit just fine.
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Old 07-29-2009, 09:36 PM   #3 (permalink)
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no they are not the same thing. You do not "adjust" the pilot screw, you screw it in all the way. the D shaped tool you used was on you idle mixture screw. I have the hand screws from newbonneville and they fit just fine.
OOps, my bad. I think he said turn the fuel mixture screws, and I must have written it down as the pilot screw. He knows what he's talking about, and I'm still trying to learn enough to "tinker" with my bike and still stay out of trouble.

Do you have the electrical connections right next to the fuel mixture screws on your bike? There seem to be just enough minor differences between models and I have to double check things before moving forward.
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Old 07-29-2009, 09:43 PM   #4 (permalink)
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Originally Posted by skromfols View Post
OOps, my bad. I think he said turn the fuel mixture screws, and I must have written it down as the pilot screw. He knows what he's talking about, and I'm still trying to learn enough to "tinker" with my bike and still stay out of trouble.

Do you have the electrical connections right next to the fuel mixture screws on your bike? There seem to be just enough minor differences between models and I have to double check things before moving forward.

yes I have the same connections near the screws. they fit just fine

in the attached picture you can see it on the very top left. It is the gold knob
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Idle Mixture Screw/Pilot Screw-picture-009.jpg  
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Old 07-29-2009, 10:55 PM   #5 (permalink)
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The answer to your question is YES--the so-called idle mixture screw that uses a "D" tool to adjust IS the PILOT adjustment Screw. Some start with this adjustment out about 1.5 turns. Be careful when screwing it all the way in to count the turns out--the seat can be damaged so a light touch is best here.

The PILOT JET is NOT to be confused with the Pilot adjustment screw. The pilot jet fits INSIDE the carb fuel bowl area. The adjustment screws can be adjusted from the ouside of the fuel bowl, i.e. that is without removing the fuel bowl. You didn't ask, but the main jet screws into the "needle jet holder". A service manual is worth its weight in gold if you are not familiar with Triumph's names for things like this.

All the Pilot adjustment screws are in a very tight area, IMHO If you are worried about enough room, email Brent at NewBonneville and ask him. He has probably put these screws on both bonnies and Americas.
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Old 07-29-2009, 11:20 PM   #6 (permalink)
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skromfols I swear we are not just trying to confuse you

Redbird is right about the semantics but don't confuse the idle mixture adjustment (which is actually called the "pilot screw") with the "pilot jet." The one you are adjusting is the only one "outiside" of the carburetor.

Anyway those handscrews fit. They are sold at newspeedmaster.com as well as newbonneville (not sure if you knew that they have a website dedicated to the america and speedmaster)

see: http://www.newspeedmaster.com/html/i...re_screws.html


but feel free and contact Brent so he can tell you they fit also
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Old 07-30-2009, 06:56 AM   #7 (permalink)
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Redbird is correct, the idle mixture screw and pilot SCREW are one and the same. The NB thumbscrews make the job a lot easier but, yes, the connectors for the carb heaters do get in the way on one side (but not the other) on my T100. I just disconnect them when adjusting the screw. Apart from from some internal jetting and needle differences, the CVK carbs on all these bikes are externally the same.
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Old 07-30-2009, 09:35 AM   #8 (permalink)
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Thanks for the information. I have the Haynes manual, but the only illustration of the pilot screws shows them in a different location than they are on my bike. I'm really disappointed in the Haynes Manual, the illustrations and explanations are not nearly as good as those in the manual for my Valkyrie.

I'll be ordering the pilot adjust screws from Speedmaster later today. I got my center stand from them and was very pleased with the service, and the center stand is really helpful.

I appreciate everyones help on this site. This is far from my first bike, but is my first Triumph, and I have a lot to learn.
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