QuestionJan, thanks for being there for a couple of CBX-related questions from a few of my customers. When I'm not certain, I send them to you.
Here's what I have:
I pull slow air jets by threading them for 3mm and use a piece of rod to pluck them out. I only bore down into the barrel of the jet by perhaps 8-10 mm.
99.99999 percent of the time the jet comes out clean and unmarred, except of course for a bit of clean threading in the uppermost portion of the bore. Nothing I do comes even close to affecting the size of the jet in the nozzle end, which is to say I *COULD* clean it like new, which I don't currently do. Those beggars are expensive and if I could reuse them like others it would save bookoo bucks.
My question: Is the fact that I'm very slightly increasing the diameter of the jet bore at the distal end (away from the business end of the jet, as it were) affecting the total mass of air traveling through the 35 orifice, ie. richening or leaning?
In other words, can I safely probe for size, clean, and RE-use those that are completely undamaged in any other way?
My engineer friend says that the difference would be miniscule under the conditions inside the emulsion chamber but he's merely an egghead, not an, ahem, motorcyclist.
Tia for kicking this one around!
AnswerAs Bernoulli said a long time ago, you can do at the fat end what you like, it will not affect anything at the thin end if it is unchanged. Other than going into Vortex theory where the air or fuel coming into the jet experiences a 'swirl' effect because of the thread you put in, I don't see it varying anything.
I extract and clean my slow jets the same way...!
Good luck, Jan
