Join Date: Nov 2009
Location: Lander, Wyoming
Steel is fine. My first one was steel, I'd soldered the hole closed & re-drilled smaller, several times. Later versions were the brass 1/16th" NTP .
Normk up in Chilliwack annealed over 30 steel set screws to be able to drill them, because they were easier to obtain.
I believe that Tom is still running his #43 / 2.26mm / .089inch orifice.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 85,000+ miles & counting