Hi buddy
Tha answer is simple:just replace your reeds,reeds is a one way valve,it opens to let the air and fuel/oil mixture in,and is suppose to close after that,if the reed is leaking,once your pistons is under compressoin,it will put pressure against reeds,now if the reeds doesn't seal,it will only spit the mixture back again(atleast some of it,had same problem.new reeds,runs like a bomb