My son's KLX110 runs well only if I leave it on choke. When I take off the choke, it sputters quite a bit, especially in 2nd and 3rd gears. Any ideas on what I should check first?
Rotorranch has good point I try install a spark plug first
Has the bike been seating for a very long time if so get Berryman B12 Chemtool Carburetor Cleaner Pour Can just pour in 2 to 3 cap full in gas tank it will clean out the carberator by dissolves gum and varnish from inside the carburetor with out take it a part just run it with choke on and off 10 min each time.
Clean the card the right way, just get a can of a good cleaner (CRC, Berryman's, etc...) and disassemble it and spray all the passages and parts (be careful not to get a face full from blowback).