Decided to take a quick ride 3/23 after work since it was a nice day and I needed to start getting some seat time. I've worked very hard this winter on training and balancing/body positioning drills and have felt extremely comfortable on my bike. I felt like I was riding very smooth and kept telling myself "slow and smooth cause smooth is fast". Im still putting my Gasser back together after a total rebuild so I was out on my CR 250. I was practicing gripping the bike with my legs and it is difficult on the 98 CR since the bike is very narrow and straight. By the time the body flares so you can catch yourself your legs are very far back on the numberplates and front arms are completely outstretched. I had gone back and forth several times and was riding pretty good. One the last pass before heading home I was coming up a rolling hill and the powerband started to hit which threw me back. I caught myself with my legs but my arms were straight and I was still hard on the throttle in 3rd gear. The bike wasn't going to flip and I knew the trail so I planned on ridding it out and all would be fine. With the front tire off the ground the bike in an instant began to turn right very fast and before I could react I hit an 18" hickory tree. I was able to somewhat shield myself from the tree with the bike as the front tire just missed it. I hit it anywhere from 25-35mph im guessing right on the pipe and clutch cover. I remember turning my body at the last second to try and miss the tree but I hit it hard with my rt arm and rt hip/leg. I knew I broke my arm and my bike was leaking oil and the pipe was completely smashed shut. Called my wife and she was trying to find someone to find me. Sat there about 5 mins and started the 2 mile walk home. Guys got me about 3 mins from home and off to ER we go. I fractured my rt olecranon into 7 pieces and broke one of the 2 bones in my rt forearm halfway btw wrist and elbow. Was in surgery for 8hrs to repair it and have 3 plates an my arm. With that said Doc says I should have a full recovery which I am very thankful for. Another 4" right and it would have been head on and who knows what could've happened. Very thankful I am only nursing a broken arm. Very sad though that this prob ends my enduro racing career that is only 2 years old. At 35 I prob cant chance hurting this arm again. I fell in love with this sport and felt I was so close to becoming a much better rider. We'll see what the doc says but I will prob be left with a big ? as to what kind of a rider I could've become. I really saw myself doing this well into my 50's and am pretty bummed out but hey, at least im still here!