Hi Fellas 
The rear shock on my bike seems to be too soft, as when I am stood on the bike, the rear mudguard seems very close to the tyre.  I have checked and the spring is wound up as far as it goes. 
Does this mean the shock needs a service? 
If I have it serviced new seals/oil etc at £100 will it remain the same as it is now or will it increase the distance between the tyre and the mudguard when I am stood on the bike? 
I weigh about 13 stone.   
I looked into buying a new rear shock but at £350 its far too expensive for a bike of its age. 
As you can probably tell I am am no suspension expert so any advice would be very much appreciated. 
Ta in advance.