Chainsaw Repair

52mm fits the 272 which is the base piston I used to build the wide skirt from but will fit the 7900 and the 460 stihl, now remember these pistons are for race not woods port AND you have to have the cylinder bore replated in nikisal cause the ring used from Wiseco is only meant to run on nikisal , if you put this ring in a standard chrome bore it will last a very very short time cause the ring will tear the chrome plating all to hell . You also need to use the light weight 460 wrist pin . Another thing  when getting the cylinder replated I run abit more clearance , Box says .0015 , I run .0022 to .0025 clearance plus the clearance given on the box was before the coating on the piston so your under the .0015 in true measurement with coating , .0015 is just to tight for my liking