I have recently bought a new bicycle and the left Shimano Revo shifter (3 speed) is not shifting, what can I do?
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To really know what is wrong we need more information. But to give you some help:
If you don't know how to re-adjust the gear to shift correctly: - Clean the derailleur (which pushes your chain to another gear). - Push the cable back and forth a bit, and if possible, oil it a bit. If this didn't work and you don't know how to adjust your gears to work correctly, bring it to a bicycle mechanic (such as me!). Because you can't do much more without disassembling the cable.
If you do know how to re-adjust the gear, this works better: - Disassemble the cable. - Clean the derailleur, and put some grease on the spring. - Take out the inner cable, and spray a lot of oil in the outer cable - Assemble the cable inside the outer cable. Check if the shifter works correctly by pulling the cable and shifting. - Assemble it al again.
edit: it took me 2 edit's to correctly write 'inside'!
If you have only just purchased the bike it would be within its warranty period. If it is not shifting it could be for a number of reasons but I would take it back and get it fixed free of charge as it is there obligation to fix or exchange it.