Originally Posted by powers2b
Lube your cables, shifters and derailers.
Then make sure the RDR is not hitting the limit screw.
Then increase the tension on the RDR cable 1/4 turn at a time.
This guy doesn't know a whole lot about bikes. What I would do (since you don't have a hanger alignment tool I am assuming) is grab the der. and rip it as hard as you can towards the top of the rim and add a little tension to the cable.
BTW for this poster when a bike is a failing to shift in only two gears it suggests an allignment problem. Further since he is having a problem shifting from 1 and 2 it also suggests a problem with the D-screw.
Its really the blind leading the blind on these forums.