So the Red with 40 idle and 120 main jets was idling fine, but around 5000 rpms there was significant hole, not just butt dyno feeling, real hickup.
The needles were already all the way up (5th notch) , decided I need 125s. I estimated that I should go with needle in the middle and 125 and it would be just perfect. Got it all done on Saturday, confident she is in good shape, didn't bother test start/ride her.
Fast forward to Monday morning, 7AM. In full gear, started her up and she would not move, rev up in idle, nothing. Only the idle was there. Dropped the helmet, jacket, gloves, started wrenching.
Set the I needles all the way down (1st position) and that was quite the surprise. She idled right at 3000 rpms
and there was no way to knock her down, nothing.
Pulled it apart again - BTW, jetting K0 carburetors with breadbox filter is kids play compare to this. On K0 I can move needles up and down with carburetors still installed - to realize that the needle sticks in the top jet. The needle taper was too big for the top jet, slides were staying up, she was reving like crazy - you got the picture.
Luckily I had decent set of needles in my stash. Set needles on the first position, took her up and down the road, all is well. Geared up again, 3 hours later, smelling of gasoline, took off. 30 miles on local roads, she revs easily, accelerates as expected, plenty of power.