Pilot screw seating - Honda Rebel Forum
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post #1 of 4 Old 07-16-2019, 03:23 PM Thread Starter
Join Date: Jun 2019
Posts: 8
Pilot screw seating

Hey all,

I have cleaned my carb and replaced jets. No modding, just a new set of jets. I am confused on the seating of the pilot screw. People say, screw it in until it is softly seated and then back it out 2.5 turns to start. What is softly seated, as I am screwing it in, what feeling or clue am I looking for that tells me it is softly seated, vs overtight? Thanks in advance.
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post #2 of 4 Old 07-16-2019, 05:45 PM
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Just screw it in with your fingers until it seats, then back it out. You shouldn't have to grip it tight.

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post #3 of 4 Old Yesterday, 09:35 AM
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The pilot screw is set at the factory using an exhaust analyzer and may or may not be 2.5 turns open. 2.5 turns pretty much guarantees that it will run and allow proper adjustment. If you have a colortune plug then adjust as follows. Get the engine at running temperature and at idle. Close the pilot screw until you see a flicker of white (lean). Open the screw until there is no white. Install new plugs and ride the bike about 15-20 miles and pull the plugs and look at them. You are looking for a light brown or grey color on the plug enamel. If still white, open the pilot screw about the width of a dime. Continue this process until you have a nice light brown or gray color on the plugs. If you do not have a colortune plug, start with the pilot screw at about 1.5 turns and make the adjustments. I have a 4 cylinder, 4 carb Yamaha and 2.5 turns open is the standard starting point. But using the above process my pilot screws are set between 1.75 and 2.25 turns--each carb is a little different.

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post #4 of 4 Old Yesterday, 07:17 PM
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The idle adjustment screw has a slightly tapered needle tip.. if not lightly seated tip is jammed into aluminum passage of body.. the brass tip of idle screw has been known to twist off plugging passage if over tightened..

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