Thinking on this more I think your approcach is better. When drilling jets its not as exact as when you buy a sized jet so if you go up to the 119 size you should still be able to tell if it has improved the issue you are having. then keep going up gradually till it stops improving. (if lean condition is your issue).
WOW WOW WOW!!!
I took a new #56 bit and grabbed my hand air drill (I'm arrogant enough to think I can do this without a drill press!).
Put the jet gently in a vice horizontally and quickly ran it in and out once. Took my air blast and blew it out.
Put it all back together, couple of pulls and she was running but like CRAP!! Chug chug, stutter stutter.
I'm thinking I just smoked a jet, maybe left some slivers behind and smoked the carb.
Last thin to do was pull the "kit" air filter off ... so I did and the first thing I see is gas around the seal ... hmmm ....
toss it aside and pull the rip cord ... VAROOM!!!!
WOW!! I'm not sure there is a top end but I didn't find it going down my street ... opening that jet brought that engine to life ...
I did a couple hot laps at hi RPM and shut the motor off while it was at hi RPM and coasted into my garage ...
The plug was pulled and looks like this ...
That looks damn near perfect to me!!
ole4, you nailed it again!!
Thanks amigo!
I pulled the plug boot and this stayed on the plug ...
It's always something!