Hi, I am new here and also new to motorcycles. I have the opportunity to purchase a 1978 Kawasaki KZ 650 for $750 but two outer pistons are not firing. I hope to purchase this bike to convert it into a cafe racer. Should I be concerned about the fact that it has two outer pistons that are not firing? Also, it has 35,500 miles on it. Other than that, it appears to be in very good condition. I look forward to hearing what any of you have to say.