I have a question...I purchased a 1980 suzuki dirt bike for $25. Didnt know if it was running or not. I got it to run for a few seconds but have since learned I probably had the wrong oil/fuel mix in it. I was wondering how I could tell which model it is. I am 6' and without a seat on it I touch the top of the frame. I cant tell if it is the 250cc, 125cc or 400cc.