Pilot/Low speed jet diameter

Good day gents;

Doing a basic cleaning of the Keihin 34 Carbs off a 1980 KZ750 LTD (Four cylinder)

The slow speed jet is marked as a #62, I can't for the life of me find what diameter hole this should be when clean. I usually find a piece of copper wire the same or just under diameter and poke the holes of clogged jets with them. But I like to be sure of the hole size before I start jamming wire in that won't fit.

My best guess is the 62 jet is about .0225 if an inch or .57mm. I can find lots of charts for the higher speed jet, but not the low speed.

I thought the number referred to hole area in circular mils but it's been decades since I screwed with jets so I could be wrong.

#62 is the primary main jet. The slow speed jet is #35 and is below the plastic plug.
If you can, use some carb cleaner spray can and then blow with compressed air. It is dangerous to mess with wires inside the brass jets.

By the way if I remember OK, #62 jet is 62% of 1mm --》 0.62mm

undiablo wrote: #62 is the primary main jet. The slow speed jet is #35 and is below the plastic plug.
If you can, use some carb cleaner spray can and then blow with compressed air. It is dangerous to mess with wires inside the brass jets.

You're right, it is a main jet.

How do you get the plastic plug out? Just pull or should I mess with it at all?

From my reading the Keihin jet #'s are based on flow rates, not diameter unfortunately

How does one get to and clean the pilot jet?

May be I was wrong.

You just pull the plastic plug up (AKA polyester cap). It has a small o'ring that holds it in its place. May be it is a good time to replace it.

Thanks!

I don't see any o-rings under the plugs, but the plugs do seem to have some sealant that was holding them in place; some black stuff.

Can anyone tell me the height these floats should be set to while I have them out? I read the procedure with the clear hose etc. I would like to set or at least check them before reinstalling however.