Chainsaw Repair

All AM. I just got a 56mm top end as well and the casting actually looks pretty good. There is some casting related roughness on the "sharper" edges of the ports, but my bet is it works pretty well. Maybe a mildly tweaked 56mm dia top end on one of those AM bottom ends to see if it can handle some abuse? The piston in the kit looks really good as compared to other AM offering's. The wall thickness is there and uniform. And the rubber parts that came with look a lot better than their Husqvarna counterparts.... this might be interesting. Going to build up a second one in the 56mm BB configuration ... then run it vs. that first one and also with my bud's 661.