My Dad's old 1987 model 50 husqvarna finally refused to start after over 20+ years of firewood cutting. I told him I would look at it and see if I could get it back into service. Pulled the muffler and the piston and and ring are heavily scoured. I believe the stock piston and cylinder are 44mm. There are plenty of 45mm and 46mm top ends out there on the net. Does anyone know if there would be any problems simply stepping up to the bigger piston and bolting up the 46mm cylinder (originaly for the 55 rancher). Looks like a simple big bore upgrade but the current carburator is the Walbro WA 82A. Would the carb. need an upgrade as well?