Ok, in my opinion your situation boils down to this. I would not set my goal as a weight loss goal but rather to get in the best shape for motocross as you can. Where your weight ends up being will be what is the best for your physiology. In other words, train for motocross and forget about your weight. Now the tougher part; how do YOU
train for motocross. Well, you can either hire a personal trainer like Coach Seiji, Robb Beams, or myself and we will evaluate your current physical state and design a program around that or you can become a student of training and read every single article on this site and put your own program together. A good place to start is reviewing the 19-week free training plan
we posted last year. Coach Seiji and I are also working on a premium section of the website that will offer various workout plans for you to chose from. That should be available in a month or two.
The more you read the more you will understand things like eating. Research shows that eating 6 small meals is no different than eating 3 larger meals
per day. Thea amount you consume during the day is what is important. The time of day you eat
is also irrelevant to some extent. All of these questions and everything you want to know about lifting heavy, light, reps, etc., etc. are contained in the articles either on this site as I have linked above or on other reputable sites like WebMD. That is the reason the site was built. To gather a library of credible information so the guy who cannot afford a personal trainer can learn and put together an effective training program.
I know it is a lot to learn so my other advice is this. Do not over think training and make it complicated. Train hard, train smart and above all train consistently!