I've been trying to straighten out some shifting issues on a kid's bike, it's a Diamondback and is a few years old. On the front gear-set it has a few issues that I am having trouble fixing through l and h screw adjustment and indexing.
When shifting from the small ring to the middle it doesn't always make the shift, I have to twist it a little past the audible click to ensure a shift.
Also it's shifting into the big ring way too early. When moving the shifter about halfway to the audible click it's already moved over, letting go at this point results in a downshift.
From what I'm interpreting fixing one of these issues would make the other worse. Does anyone have some tips?