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View Full Version : Can some one tell me how and what are jets?


suZuki400
08-18-2005, 11:16 AM
When and why would I have to change my jets to bigger ones? What do they do, and are they easy to install?
Pvt. Maggot
08-18-2005, 11:21 AM
Jets are what controls your air/fuel mixture. You change to bigger jets when installing a new pipe, or airfilter, anything that changes how much air and fuel the motor needs to run right. bigger bores, ect. :)
suZuki400
08-18-2005, 11:24 AM
Is that something I could install myself?
Pvt. Maggot
08-18-2005, 11:31 AM
Yes, its not hard at all to change jets. Its more of a pain getting them perfect. There are different sizes, and there are different jets, there is a pilot jet, and a main jet. pilot sizes are like 50, ect. and main jets are like 140-150 ect. each jet controls a different part of the throttle, I believe the pilot gos up to like half throttle then the main jet takes over from there. but i'm not positive on that. I haven't got to play with a carb for awhile, hah :p
underpowered
08-18-2005, 11:44 AM
pilot is maily up to 1/4 throttle. The main jet is good for from 3/4 thru full throttle. the the needle controls from 1/4 to 3/4. i think thi is right, but dont hold me to it. Usually when you change a pipe or airfilter. you may have to move clips on the needle and go up on your main jet.
suZuki400
08-18-2005, 11:47 AM
How much will these cost me depending on size?
underpowered
08-18-2005, 12:09 PM
at most shops they are about 4-5 dollars each. all sizes should be the same price.
suZuki400
08-18-2005, 12:51 PM
Oh okay, I thought they would be hundreds of dollars, thats not bad at all. I think thats worth installing your own jets.
bwamos
08-18-2005, 01:31 PM
http://www.atvriders.com/articles/jetting.html
murrays400ex
08-18-2005, 03:46 PM
50$ for a kit and all u do is take off the bolt on the botem of ur carberator and unscrew the jet and change
400exrider707
08-18-2005, 09:34 PM
Originally posted by murrays400ex
50$ for a kit and all u do is take off the bolt on the botem of ur carberator and unscrew the jet and change

Not quite. Yes if your only doing a main, but you also should be doing needle clip movements and pilot jet changes, in which case you should remove the carb.
UglyMotha™
08-19-2005, 05:28 PM
are we talking bout the kind that do loop de loops in the sky or the jets that go in the carb :o