Join Date: Jan 2016
Location: Rum City, Qld / Australia
Welcome to the forum fellow rfs owner.
It could be rings or valves or hopefully not a buggered bore.
I would first check your valve clearances. If your valves clearances are to tight and holding the valves open you will lose compression. Basically if the cylinder isn't sealed for the compression stroke you lose compression. So it could be a few things. Rings, bore, valves, valve timing, No 1 thing that usually goes
wrong is the valves. Was it blowing blue smoke when you were riding it?