Is there a way to drill jets?

[DMorris]

I thought Mikuni jets were graduated in flow rates, not diameters?

That's what I was thinking too.

Everything I've read on the subject says not to drill jets.

Drilling does not produce a hole smooth and consistant enough to produce reliable results. Very minor inconsistancies at this size can make a large difference in flow. Your jets will, very likely, all flow at different rates.

In fact, I read that even trying to clean a jet with a piece of steel wire is likely to distort the jet by raising a burr.

[tejasmud]

Pretty sure they are too. Everything I have read points to grams of fuel to grams of air, I think on Mikuni mains. Keihins run by drill size, I have measured them on an optical comparitor many times.

Not that drilling jets can not be done by someone who knows what they are doing, but if one has to ask, just buy them.