Bought 1990 Trail Boss 250 and I have a question or two. The previous owner remove oil tank so that I have to mix gas every time. Is that OK? I was reading something about how the oil tank lubricates before mixing with the gas. Second question is there a way to beef up the front brakes there not very strong. I base this off the fact that on motorcycles it’s the primary brake. Last my quad has no rear brake previous owner broke it and removed it. So I’m looking for a rear brake assembly what year and make quads have the same brake assembly.