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Carb Jets... what do they do? (Read 7 times)

djpennin YaBB Newbies Offline poo Posts: 38	Carb Jets... what do they do? 05/18/07 at 09:29:48 so on the carb i know of 4 jets or screws> 1. main jet 2. pilot jet 3. screw on right side 4. idle finger screw on left what do all of these do? how does a 145 main differ from a 152.5? how does a 45 pilot differ from a 50 pilot or 55 pilot? thanks
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vroom1776

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Re: Carb Jets... what do they do?
Reply #1 - 05/18/07 at 09:42:58

the larger the number, the more fule it will deliver. for mikuni jets, the number means cc of fuel per minute (I think).

main jet delivers fuel from 3/4 to wide open throttle.

pilot jet delivers fuel from what, 0-1/4 throttle

screw on rhs uh, is this an air bleed? I forget. but it basically it adjusts how much air the pilot jet sees.

idle screw on left: the more you turn it, the mnore the butterfly valve int he throat of the carb opens. the more it opens, the more air & fuel the carb pulls at idle. in the VM type carbs lancer sells, the idle screw goes into the carb throat, and the slide rests on this. the end is not threaed but tapered, so turning it in pushes the slide up more, giving it a higher idle rpm.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Carb Jets... what do they do? Reply #2 - 05/18/07 at 11:34:39 the larger the number, the more fuel it will deliver. main jet delivers fuel from 3/4 to wide open throttle. pilot jet delivers fuel from what, 0-1/4 throttle screw on rhs, this is an air pilot screw. but it basically it adjusts how much fuel the pilot circuit gets. idle finger screw on left: adjusts idle rpm.
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djpennin YaBB Newbies Offline poo Posts: 38	Re: Carb Jets... what do they do? Reply #3 - 05/18/07 at 13:08:32 So on lancers carb adjusting techinical reference. which screw do you screw in/out ?
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Savage_Rob

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Re: Carb Jets... what do they do?
Reply #4 - 05/18/07 at 13:10:02

djpennin wrote on 12/31/69 at 16:00:05:

So on lancers carb adjusting techinical reference. which screw do you screw in/out ?

He references both. When he refers to the pilot adjusting screw, he's talking about the pilot adjusting screw on the right. When he says to turn the idle up or down, he's talking about the thumb knob on the left side.

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