I did search this forum and also read Sheldon Brown's and Park Tools sites amongst others, but I couldnt find anything relating to the problem that I have.
I'm very new to this so I may have made some dumb mistakes, hopefully not too expensive!
The bike is a Shogun Trail Breaker, older bike, maybe from the 80's, steel frame, Shimano SIS gears, 18 spd. So I cleaned the chain basically using Simple Green (50% mixed with water) and then running a cloth along the chain as best as I could - I dont have a stand so rotating the pedals is awkward.
I didnt dry it excessively ie I wasnt obsessive about removing all the grease. I then took it for a very brief ride and ran through all the gears - no problem. I probably should have oiled the chain before going for a ride, but I didnt thinking there was enough lubrication for a very short ride - literally 2 minutes.
Came back put some oil on it, not too much, and found that it was difficult to rotate the pedals, so I went out for another brief ride. Not only was it difficult to rotate the pedals but I started to hear some clunking sounds coming from the crank (I think it was clunking, maybe groaning) and the pedals just stopped moving. I put some more oil on it which didnt help and then I had to go pick up my son from his daycare and now it's too dark to work on it but I'm hoping to get some advice so I can work on it in the morning.
Appreciate any advice on what might be the problem and what I need to do. Thanks!!