Still have a bit of miss at 1/4 - 1/2 throttle after installing the RKT insert. Originally I had it leaned down with the stock head and fattened it up when I put the RKT head on (after reading what is posted for the RKT insert). I ran it for a couple hours with the settings as listed below but with the clip at the 3rd position and no work on the slide notch. When I pulled the plug it was oily black and there was a lot of spooge compared to the stock head and lean settings.
Mikuni with 43-74 clip 2 (I tired clip 3 at first but was worse at 1/4 - 1/2 throttle)
PJ=40, NJ=S1, Air screw=1.5 turns, and MJ=490, slide notch filed out to ~ 5, yellow PV spring 1.5 turns from flush (need to play with this a bit before more changes). The air screw works as I think it should, that is if I turn it in all the way the motor dies so this suggests my PJ is pretty close?
I'm old so I don't ride up high in the rpm range too much, tight woods mostly between 1700 and 3500 feet, 50-60 degrees, 93 non alcohol mixed at 50:1, .
I'm thinking I need to play some with the NJ and the needle at this point? Any suggestions to clean up the 1/4 - 1/2 throttle settings?
By the way, I love the RKT insert for $150, works as advertised.