Ok i am new to jetting and the process seems easy enough but for me and those others who lack in this area what jett does what?
Pilot----?
Mid-Main---?
Main---?
Needle Shim---? (washers on needles)
Turns out---?
Quote from: souljeroflight on August 26, 2008, 12:51:45 PM
Ok i am new to jetting and the process seems easy enough but for me and those others who lack in this area what jett does what?
Pilot----? 0-1/8th throttle. Typically take off rideability is adjusted with this. Ilde is adjusted with Turns out ... but they both control that 0-1/8th throttle.
Mid-Main---? Who knows ... they came up with this BS possibly after we decoded the needles. Cynical me.
Main---? 3/4 throttle and up
Needle Shim---? (washers on needles) Needle controls 1/4 to 3/4 throttle, shimming them lets a smaller diameter serve as an obstruction in the emulsion tube. So it stays at 1/4 to 3/4 throttle for effect, but acts like its a hair more open than it is without the shim.
Turns out---? Idle and take off, and adjust it for idle but take off also can be affected. If you cant get one right without screwing the other ... 1 on a GS, you doing it wrong or some crap is clogged up or the carbs are waaaaaay off balance or the synch is really off, or valves are not closing or you have an intake or exhaust leak or some electrical sheite is broke, or you dont even have a GS and are wasting our time. ... but in case that happens on a hypothetical bike, and you dont want to send it to buddha ... you will notch the butterflies ... and depending on what you're seeing, you'd notch it in a different spot - top or bottom ... but remember, this is the equivalent of an atomic bomb to kill a cockroach.
You're missing ...
1. float level ... that is mainly as you open the throttle between 1/4 and 1/2 throttle. You cannot really adjust it, its gotta be set within 1-2mm ... else its can be a disaster ... but it does affect this.
2. Slide hole - open the throttle fast and it falls on its face, open slow and it revs up nice and good under high load. Slide needs to have 1 hole blocked and may be other one partly closed ???
Also remember jetting in dependent on throttle position not RPM. The right reading of how a bike is jetted will have to be determined after it reaches steady rpm and not as its getting there. Most of the finer tuning of this will have to be done under heavy load. 5th and 6 gears. Standing and revving in your driveway will not tell you if your main jet is right for your filter.
There is more ... and no wonder people get confused. This sheite sounds like I am making it up. But then again you knew all this, its only for others ... :wink:
Cool.
Buddha.
Joan hates herself for loving you.
What ???
Who's Joan ?
Maybe I made this all up ... bwahahahahahahahaha ... :icon_twisted:
Cool.
Buddha.
That's what that Jett (http://en.wikipedia.org/wiki/Joan_Jett) does!
The way I understand it is:
Pilot---- Idle to 1/4 turn
Mid-Main--- Someone needs to cover mid main because i dont have one of these.
Main--- Main jet is about 1/4 to full throttle (correct me if im wrong guys).
Needle Shim--- Raises needle higher. The needle is basically plugging the main jet. As you add shims to the needle, it raises out of the main jet letting more fuel out. I've found that this mostly affects mid range...
Turns out--- Air mix screws. This is also for idle... and from idle to 1/4 turn throttle (at least thats how it feels to me). The screws are also acting as fuel plugs like the needle. As you turn them out, its kind of like an outdoor faucet allowing more fuel to flow making it richer.
With a basic understanding of how the jets work.. and carbs as sr****h pointed out... you'll be able to tweak your carbs to make it all flow nicely. Good luck..
Edit:
Whoops... didnt realize he already responded.