I found an '01 YZ125 for sale that I can pick up for about $300. The engine was just rebuilt. The problem is that it doesnt start right now. The current owner claims it is because he lost the cover for the power valve. Will that cause it to not start or is there most likely something else wrong? I havent bought it or tested anything yet. I just pushed the kick start to make sure the engine turned over. Im very new and inexperienced with 2 stroke engines. Ive always had 4 strokes up until now.