The cdi on the 110 is very reliable,a Chinese copy for replacement is cheap but not as reliable if the the standard one ever fails.I find the 110 a jump on and ride type of bike,though it is a later model 110.I've never owned a running 90 to compare things to.Did you guys get the handbrake lock for the front brake?Very handy on the trails and something that might be able to be adapted to a rear handlebar mounted brake.