The worst thing about chisel chain it that soon as you hit something the corners get rounded off and you lose 1/3 of the link to get it sharp again . Steve
Are you trying to say it shouldn't 4 stroke out of the cut and clean up in the cut. Have you ever run a well tuned muff modded Echo that was broke in. Steve
He said it's 4 stroking lightly which means it most likely is lean or running up against the rev limiter, Echo saws have the best torque of any 50cc saws, he said his is low on torque which points to it being to lean. Steve
It could be the coil, after you get the piston in try running it with the old coil first. I think the wear on the piston skirt on the intake side was the problem. Steve