Here's a link to the thermo bob.
http://watt-man.com/ I believe there is a KLR250 version. Check the info and articles/FAQ section.
Also available at rocky mountain atv but I believe only for KLR650.
$.22 mod is just a way to shim the stock needle. Add a couple #4 stainless washers under the needle and drill the hole in the slide a little. At least for the KLR650, it wakes it up a bit, better throttle response. KLX needle kit is also and option.
Rojo