Spankys jetting guide

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Post by midlifemoto » am Mar 28 Post by skipro3 » am Mar 28 Post by bmcd » am Mar 28 Post by fuzzy » am Mar 28 Post by scheckaet » pm Mar 28 Post by midlifemoto » pm Mar 28 Post by Indawoods » pm Mar 28 Post by fuzzy » pm Mar 28 Post by Jeb » pm Mar 28 Post by Mr. Wibbens » pm Mar 28 Post by midlifemoto » pm Apr 01 Post by canyncarvr » pm Apr 01 Spanky's jetting tip Got questions? We got answers Post Reply. Spanky's jetting tip Quote Post by midlifemoto » am Mar 28 "If your air screw is less than 1 turn from closed, you need a larger pilot jet.

If it is more than 2. I thought it was the opposite? If the air screw is in too far it's too rich and out too far too lean Contact skipro3. Quote Post by skipro3 » am Mar 28 Let's think about this; Turning the air screw out adds more air. The right spot of the air screw is to have the correct balance of fuel to air. Less than 1 turn out means that there is just a little air to balance what must be just a little fuel.

More than 2. So if you want your air screw at some fixed setting, say, 1. You add or take away fuel with the pilot jet. So, it looks like your statement makes sense to me. Of course, if I'm wrong, I'll find a way to blame someone else. Jerry I'd rather be a smartass like carvr, than a dumbass like Quote Post by bmcd » am Mar 28 The air screw is a big deal at idle primarily. While it does have an effect all the time, the only time I have ever really been able to tell a difference is at way low throttle settings.

Anyway, to think about this we have to think about what is going on in the carb. When you diddle with the air screw, you are looking for the place with the best mix of air and gas. Conventional wisdom is that you should find it at somewhere between 1. The air screw controls the amount of air, and the PJ controls the amount of gas. If your air screw is less than 1 turn from closed when the mix is correct, it means you are letting in almost no air when the mix is right.

So you must be getting almost no fuel. So you could add both air and fuel. So you need a bigger PJ, because when the bike is on the pilot it is starving for fuel. If your air screw is way open, it means you are having to let in lots of air. So you must have lots of fuel. So you need a smaller PJ, since having to back out the air screw too much at idle will mean that it will run rich as your throttle position moves up from 0 and the air screw can't let in additional air. Quote Post by fuzzy » am Mar 28 Sorry, but that's wrong.

Quote Post by midlifemoto » am Mar 28 I have been conflicting opinions even from bike service shops OEM pj is 55, it has a 60 in it So I was told that if I wanted to get the same within the turns out range I would need to get a 65 pj, which I had to order Quote Post by scheckaet » pm Mar 28 my head hurts, trying to figure that one out.

What about this "general" statement: if you are spot on at say 50F and you ride at 30F all other conditions beeing the same like altitude and humidity Am I right? Quote Post by scheckaet » pm Mar 28 "If your air screw is less than 1 turn from closed, you need a larger pilot jet. Quote Post by scheckaet » pm Mar 28 midlifemoto wrote: I have been conflicting opinions even from bike service shops Quote Post by midlifemoto » pm Mar 28 My head hurts too I called the guys at Sudco, they said go a size bigger I'm guessing there is no flow chart I'm just going to experiment and learn by trial and error Quote Post by Indawoods » pm Mar 28 " If your airscrew is less than 1 turn from closed, you need a larger pilot jet.

Cause they are easy to catch. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! Quote Post by fuzzy » pm Mar 28 Quote Post by Jeb » pm Mar 28 Spanky is this dud that as a kid in the 40's built squirrel-powered wooden go carts. I think. One point of confusion on all of this may be the difference between a two stroke carb and a 4-stroke carb, i.

On a four stroke it's the opposite; that adjustment screw functions as a fuel screw and thus the logic of PJ changes is the opposite. I don't understand carb de enough to know if this is coincidental or not, but my experiences are that an airscrew on a smoker is located closer to the carb inlet and the fuelscrew on a thumper is located closer to the carb outlet.

Maybe someone can explain this in better detail. Is Spanky still alive? Contact Mr. Website Yahoo Messenger. Quote Post by Mr. This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin. Quote Post by midlifemoto » pm Apr 01 well, I tried the 65, simply because I ordered it and didn't have a 55 on hand I don't claim to know, but in my case it appears to have been the right way to go rather than the smaller pj.

Quote Post by canyncarvr » pm Apr 01 Is this all screwed ha ha ha up to anyone but me? So I was told that if I wanted to get the same within the turns out range I would need to get a 65 pj Consider the source Using a perceived level of knowledge to boost my self worth. Non impediti ratione cogitationis bike profile:! Quote Post by midlifemoto » pm Apr 01 the screw is located right side nearest the airbox The pilot circuit has two adjustable parts, fig 2.

The pilot air screw and pilot jet. The air screw can be located either near the back side of the carburetor or near the front of the carburetor. If the screw is located near the back, it regulates how much air enters the circuit. If the screw is turned in, it reduces the amount of air and richens the mixture. If it is turned out, it opens the passage more and allows more air into the circuit which in a lean mixture.

If the screw is located near the front, it regulated fuel. The mixture will be leaner if it is screwed in and richer if screwed out. If the air screw has to be turned more than 2 turns out for best idling and performance, the next smaller or bigger size pilot jet will be needed. Quote Post by canyncarvr » pm Apr 01 Quote Post by midlifemoto » pm Apr 01 clear as mud I just tonight

Spankys jetting guide

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Spanky's guide to jetting