General Discussion Forum

ok now, i understand how a carb works, if there wasnt a pilot jet or air  jet. But it gets complicated when u put that stuff in

heres a pic of what i understand:  

http://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/Carburetor.svg/300px-Carburetor.svg.png

Now im guessing that this all happens after the venturi, if not than please correct me.
skipping steps leading to venturi now air is mixed with fuel, and there is a pilot jet than can allow in more fuel, and there is an air screw on that pilot jet? allowing in slightly more air?

And there is an air jet also than lets in air....this is where im confused???

srry everyone, confusing topic for me. Please explain.  
The best source of protein is Raw Eggs~!

hmm i just commented but it didnt post..maybe i forgot to click post LOL. anyway, i was looking at this picture here

http://www.dansmc.com/carb_jet_usage1.jpg

so im assuming that all of this happens after the venturi if not, please correct me.

Skipping steps leading to venturi now air is mixed with fuel, and there is a pilot jet to allow in slightly more fuel, and attached to it is a fuel screw, to allow slightly more fuel. There is also an air jet and this allows some extra air in..

DID I GET IT!!??? -please tell me im right?  
The best source of protein is Raw Eggs~!

o..the post did go through, i look dumb now lol n e way, forget that first post, am i right?  
The best source of protein is Raw Eggs~!

ok on 4 strokes which i if remember correctly you have a crf150r right. ok well on 4 strokes they have a fuel screw and air screw. 2 strokes have just an air screw. the air screw has nothing to do with the pilot jet. they are part of the same circuit but are no where near each other and do not have anything to do with each other. i dont know anything about an air screw. if the bike is running rich on the bottom you turn the air screw out or if its running lean then you turn it in. if you go past 1 or 3 turns out from slightly seated then you need to put a larger pilot jet in if your past 1 turn out. if you go past 3 turns out then you put a smaller pilot jet in. when skip comes he can explain the fuel screw.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

ha, thanks elko. I guess im just getting confused between the pilot and air jet. But they are separate correct. I think im confused about

1) the screw on the pilot jet allows or disallows extra fuel?

2) and the air jet works alongside the pilot jet? uh see thats where im confused also.

once again, thanks guys.  
The best source of protein is Raw Eggs~!

I was just reading skipkh's comment again but slowly this time and i think i understand, heres a pic i've been looking at:

http://www.trak-tek.com/images/photos/cvCarbCutawaySm.jpg

there's like 2 names for every part so i think thats where im getting confused, but i think i have it

the pilot jet controls how much extra fuel goes to the engine, mostly at idle, and there is a screw on that jet, now this is where i get confused, this screw is the fuel screw to allow slightly more fuel, and then also there is an air jet and that has a screw as well to allow slightly more air in?

is that right?

or is there an air screw on the pilot jet?  
The best source of protein is Raw Eggs~!

no air jet. you have a slide. when at idle the slide is all the way down allowing no air to pass through. there is a small hole that the air enter into instead, its like a bypass. turning the air screw out allowes more air through this hole making it leaner. turning the screw in makes the hole smaller and a richer mixture. when throttle is turned the slide picks up and allows air to go through that.

this is where your getting confused no air jet, its an air screw. ok you just need to take it off apart one day and look at it to see how it works. i did that and i found a good site that i cant find anymore and looked at them together. months of being confused and thinking that carburaters were confusing disapeared in about 5 mins as i looked at my carb and this website. id give it to y9ou but i cant find the site now.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

ooooo I GET IT!!

now i see the pilot jet, and air screw. ah and u explained the slide part to!

thanks elko, MUCH appreciated

i should read things over and over cus u pretty much explained it several times to me lol.  
The best source of protein is Raw Eggs~!

its cool. carburaters are confusing at first but i'm just glad you finally got it cause i was getting tired of saying the same stuff over and over. jk. its cool.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

Hey elk there is a thread with a guy that needs help jetting a cr125  
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