I will definitely work on that for sure. I'm going to make instructions to go with the needles sooner or later but for now there are numerous places to dl a service manual, which i cannot suggest being copyrighted but .... Google knows all too
Take out that needle and put in this one then follow the idle mix settings post i made above, if your bike is stock you could put the stock pilot back while you have the carb out if you changed it. As stated above a stock gen 2 is on the verge of being able to run a 38
funny you should ask about the settings, see this post #142
i was probably typing same tiem you were
here it is
It's just too damn easy. Drop my needle in and have KLX power and KLR fuel economy. Keep you're wrist out of it for max fuel econ. Punch it and it'll drink like the KLX but oooooo SOOOOOO much power.
Stock bike (or near), drop in my needle n ride, that easy. if ya wanna split hairs you can drop at least a half size usually a full size on the main on a stock bike. eg 145-140 to me is a full step down, a half step down would be 145-142. (clarifying MY terminology) Just a snorkel yank and a UNI is still a stock bike. which 40 140 and adjust mix screw for fastest idle (2.0 turns on my bike) (yup need a thumb screw) 142 below 2000ft if ya want MAX HP. The stock KLR gen 2 is very close to being able to run a 38 pilot, i'm going to and see how much fuel econ i can squeeze out.
Now if a person wants specific jetting i need to know about the bike.
Drilling the slide does next to nothing but make the slide wear out faster. IMHO and doesn't affect anything mixture wise.
Once Lmod and exhaust upgrage happens then you'd probably have to run half size up from stock on pilot and a 1-2 full sizes up on main from ideal stock jetting depending on pipe so ideal on a gen 2 is 40 and 140 so with Lmod and exhaust i'd do 42 and 147. and 42 and 150 for sea level.
The needle works best for fuel economy with no shims and where i recommend it runs. One 0.020 shim will give very slightly better throttle response but will cost a bit of fuel econ
a bike should need to be HEAVILY modified to run more than 1-2 shims on my needle and at that point SHOULD run the KLX needle. (bigger valves, porting, ex upgrade, gutted air box)
Main Jet really only controls from approx 7/8 ths - full throttle, for most people, including me, the stock main jet is just fine, most of the time you're on the pilot n needle. The wee gain you get from dropping it isn't really huge and most people wont notice it at all, a half or even a full size on the rich side on main jet won't hurt and can only help torque, throttle response and acceleration.
Keep in mind these are guidelines, every bike is slightly different and every MODIFICATION has its own effects.