the first cog, its just slipping on to the 2nd one no matter how much i play around with the adjuster screw. I have even basically taken the screw out and its still skipping up. I wanted to have a blast on the bike so i have resorted to screwing the adjuster in so its sat on the 2nd cog when the shifters in first. This has made it work as such but is still skipping a little through the gears and obviously jumps over the top of the cassette in top gear
Take the gear cable and the chain off. Make sure the back wheel is in and seated correctly. Align the rear mech by eye by moving it from the first cog to the last cog and use the limit screws to line it up.
Grease the rear mech cable and make sure it travels smoothly through the outers and that there are no kinks. Reconnect the gear cable to the mech, dont touch any adjustment barrels and make sure the mech goes through the shifts from top to bottom/ bottom to top. Make sure the jockey wheel bolts are tight and then put the chain back on.
Check chain for stiff / bent links too.