Today was a beautiful day! I went for a ride today. The roads that I picked out on the map looked pretty good. But when I got there I found that about 10 ks of road was gravel/dirt. Being an inexperienced rider I thought "ok, there will be something to learn down here" I cruised out of the dirt roads and back onto tar roads. About 3 or 4 ks later I came to what turned out to be a steeply descending corkscrew corner. It must have had around 200degress of corner half of which was cut into rock. The speed sign at the top said 40ks, so not knowing the road and seeing that the corner went downhill (to the left) I slowed to 40 and kept the brakes on gently. Then it happened. I could see that my bike was not turning enough so I leant into the corner even more. It made no difference at all! I was going to prang!! I didn't have time to feel scared. It happened and was over so fast. I applied the brakes harder to slow the bike down, it made no difference. Then the bike hit the dirt at the side of the road. I don't know how it happened but I was thrown over the top of the bike. I landed on my right arm/shoulder, hit the ground with my head face down, flipped over several times and slid to a stop in some nice soft grass. I knew no bones were broken from the impact of hitting the ground. I climbed to my feet and checked myself over quickly. Nothing hurt me. The bike was still running but starving for fuel and about to stall. I walked over to the bike and tried to pick it up. It was lodged in a ditch and absolutely jam packed with dry grass from the roadside and ditch. Just then a family stopped to offer help. The dad (I don't remember his name) offered help and seemed like he didn't believe that I was okay. 'I'm fine I said, just my bike is hurt'. I tried to push my helmet viser out of my face and half of it crumbled in chunks onto the ground. Ha! no wonder he didn't believe me. Together we pushed and grunted the bike out of the ditch. During the grunting and pushing he asked me what happened. I told him I wasn't speeding, but since I went off maybe I had sped up unintentionally?. But I knew that wasn't right. I have gone around enough corners to know that that should not have happened. He lent me a screwdriver so I cound remove the broken viser bits. My bike had a broken looking left indicator stalk, what looked like a broken left mirror. The rest of the helmet does not have a scratch. I cleaned up the bike and had a carefull look at everything. The guy offered to wait until I had the bike restarted and be riding through the gears, so he knew I would get home ok. Thanks I said. Riding back home, at a sedate pace, I kept analysing what I had done. I was riding back over the dirt road when I realised what had gone wrong. The dirt from the dirt road had coated my wheels and tyres. I had not ridden the bike far enough/slowly enough around corners to account for dirty tyres. To prove my theory, once I had ridden back onto tar roads for 4/5 ks I stopped the bike to have a look the tyres. They were caked in dust and dirt except for the bit you would ride on if you were riding in straight lines. So the lesson from all this is if you can't avoid dirt roads, take it easy, very easy for the next 30? 40 ks. I've been out to wash the bike, and scrub the tyres with soapy water and scubbing brush. I'm pretty keen for that not to happen again. The injuries from this are a sore wrist, sore thumb, and a red mark on my forehead, probably where the breaking visor hit me.