hi , just been reading your thread ive got the same problem with mine . ive just put a kent 34 sport in mine with new followers and its knocking its ass off . ive swapped followers around still same . ive took it to loads off garages some say bottom end and piston slack so i took it back to garage were he s gonna strip it down but he seem s to think that its the shells around the cam . should have it back in the next couple days . if you get yours solved be for me get in contact ha tel 07716060507 cheers daz keep you updated