good link for kohler tuning info. Also... not pushing a new carb, or specifically the walbro, but the ones they make now have low and high idle adjustments like the kohler carb. Just saying, because my original kohler carb was completely warn at the butterfly linkage, and air was sneaking in at the butterfly shaft making adjustment impossible. It took an engine rebuilder sticking it in my face to show me that carbs can actually wear out. You might not need one, but if the engine runs like #$%, don't spend too much time tinkering. Life is too short....
Here's the pdf. This manual was big $ back in the 70's . Lotta basic info, but then it shows you how to tune the carbs in the last 1/2. Gotta love the internet- free!
adjustments.
http://www.kohlerengines.com/onlinecatalog/pdf/tp_1346_c_all.pdf