Like Mollydog said, and do it now. I'm doing my current trip in bits and pieces. Spreading out your travel, the experience can be savored, and each country taken in at its fullest. I read ride reports of many riders whose trip is to ride from point A in order to reach the goal of the trip at point B, missing way too many experiences and sights along the way. Lately I've been able to leave for 6 weeks at a time, currently riding in South America for under $3,000US for everything, airline tickets included. It doesn't have to be one big trip. Make it an annual part of your life. Do it on the cheap too; small inexpensive moto, watch for airline deals, travel light, and travel cheap. In between, work on your language skills and go for motorcycle adventures in your country of residence.

Reading posts above, I have to add that my in country cost in Peru last year was $2,200US for 6 weeks, which does not include purchasing/renting/shipping a moto or airline costs. That included rooms every night (no camping), food, gas, moto repairs, and personal purchases. Costs of course vary by country and by the exchange rate of the money you bring. I was able to find rooms for $15US fairly regularly, often less, and a couple times up to $20. I went through about a tank of gas, generally riding less than 200km per day on a 250cc moto. I had about $300 in moto repair/maintenance, including chain/sprocket and a couple other items, which is included in my $2,200 trip costs. I consider these costs affordable, making this kind of travel a reality.