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Can anyone help with set up for forks for a light weight female rider as currently they are crap! They move if I press down when stationary but hardly any movement when riding. Have tried different pressures but cant find the right one and adjustment of the rebound doesn't make any difference at all. Very frustrating, I have a great bike ruined by supposedly great forks!
Check loco tuning site for advice
http://locotuning.co.uk/tech-info.html
All damping to minimum to start with and set sag - around 25 - 35 % of travel should be used when you sit on teh bike - set the air pressure until the sag is right - then add rebound damping until it stops feeling bouncy
How much air pressure do you have them set up with? As a very rough guess, for your weight you'd be looking at something like 50-60psi in both chambers I'd have thought.
Basically, keep reducing the air pressures until they are moving!
Rebound won't affect how they work while riding if they're not moving.
Firstly, as TJ said, back all the damping right off.
Secondly, let all the air out of the negative chamber (on the bottom of the leg)
Thirdly, set the air pressure in the positive chamber (top of the leg) to something like 60psi as a start point.
Once you've done that, put some air back in the negative chamber (I find slightly less than the positive works best, so i'd go 50-55psi), add a few clicks of rebound (but not compression) damping, then go try it out.
Static sag should be somewhere around 25-30% of full travel with you sat on the bike, but that's not always the best indicator as you may have the sag correct but don't achieve anything like full travel.
Once you're familiar with setting them up, go an experiment. Add 5psi, take 5psi away etc. But ALWAYS follow the steps of letting all the air out of the negative chamber before making any adjustments to the positive. My mate bought some SID world cups and wondered why they felt so rubbish. He'd attached a shock pump and both chambers were giving the same psi. What he hadn't realised was that they were sitting 20mm into their travel, cos there was way too much air in the negative that was pulling the fork down (and thus equalising the pressures). All air out the negative, and bang, an extra 20mm travel straight away.
People often make the mistake of putting too much in the negative to compensate for too much in the positive. The negative chamber is there just to make the forks respond to the very small bumps but that's it. If you feel you need more in the negative chamber, try dropping the positive (and the negative) by 5psi first... It usually works!
EDIT: Oh and then add keep adding rebound until it stops feeling bouncy, but dont slow it down too much. You can maybe add a tiny bit of compression too, but at your weight, you may not need to.