Almost certainly the selector spring is broken. It's a common occurrence.
To test, turn the bike upside down and try shifting. (The spring lifts the selector UP against the shifter mechanism, when the spring breaks it falls down)
It's also POSSIBLE but very difficult to reach in through the filler plug hole with a wire and lift the shifter up to shift. The shifter arm is about 50mm in and behind a plate.
It's not too difficult to disassemble the box and replace this spring. All you need for parts is the spring, 4 bolts for the driveshaft flange (should always be replaced) and the cover gasket.
The hardest part is getting the driveshaft flange off. If you need more info post here.
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com
__________________
Grant Johnson
Seek, and ye shall find.
------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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