Well, I just got back from VA where I worked on my KX's jetting and did some testing. Well here goes:
Jetting: 162main, top clip needle, 52 main, 2 1/2 turns out on the air, #7 slide. I decided I'd get my cusin involved with me to tinker with the carb and see what we could come up with, well first, it was 80 degrees, 80% humidity, sunny, humit/hot as hell and ready to get this d**n thing streight. Well, I did ride it first before tinkering with it, running BP Spirits (100o leaded) mixed @ 32:1 using HPO, it ran great, alot of smoke and an idle! But, idle was weak, idle screw was all the way in. Running great! Twist and and shoot is the way the bike ran. Anyway, I started off by changing the pilot from a 52 to a 50 and moving the air screw back to 1.5 I fired the beast up (1st kick) and ripped the fields for about 30 minutes. Came back and it idled ok and a bit on the non-responsive side, even though it rips and does fine. So, idling, I start moving the air screw out. Which helped a bit, but still too low but better than the 52. So, having moved out to 2.5 with better luck but not enough to satisfy myself, I installed a 48 pilot. Moved the air screw back to 1.5 and fired it up, idle!!!!! No, I mean REAL idle! Crisp responce. Very slight smoke and a ripping powerband, almost too much power down low! I'm not used to any power down low as it ran too rough. So, I decided to play with the air screw anyway, which I did, moving out to 2.5 helped a bit, making it smoother. I have a 45 pilot which I will not use as I'm VERY happy with the performance I have now. It ripped down low, pulling the wheel off the ground at a scary rate and if the throttle was moved to WFO it would rip/roar/slide and wheely all at once. Very nice. Anyway, I rode a tank and a half and it rocks! Rode until I hurt from holding on so tight. Vibes were not an issue, but I could bearly notice them, so thanks to mikesmith, I tried the expanding foam idea.. GONE! 125 vibes and jetting nearly perfect. What a wonderful day!
Anyway, I rode until about 6pm and decided to quit and load up, well I decided to do a slide around the field and noticed a bit of power loss in the half throttle section, so I'm assuming I need to raise the needle a notch. Aside from that, I could not be more happy with my K5 and the jetting. Retarding the timing as made the K5 run close to like a 125 type powerband, which is wonderful for me!
Anyway, my crisp responce is at:
162 Main
48 Pilot
1st notch (needle lowered max)
2.5 air screw
#7 slide
Ignition Timing Set at Right Mark (Retarted Mark)
Future Thoughts: (will post results as I do more testing this week)
45 Pilot (maybe get that Air Screw back to 1.5)
2nd Notch (lift needle a notch)
BTW, running BP 100 I have no surging or pinging what so ever.
It's wierd that the biggest performance improvement on the K5 is the jetting. Forget the pipes, big bores, turbos and what have you, having a perfect Air/Fuel mixture is the key.