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Yes, I’m sorry, I intended to say 390. He did it a while ago and he is much more mechanically savvy than me.

I know those are the only ones that are stock compatible. I’m looking to increase the displacement. For example, my brother replaced the piston and cylinder on his ms290 chainsaw with the piston and cylinder for a ms391 and saw a major increase in horsepower and torque. Could I do something...

I recently purchased a project FS85T trimmer and the compression seems to be low in it. I figure, if I have to replace the cylinder and piston, I might as well attempt to upgrade the horsepower on this machine. How could I do that? Would a piston and cylinder from a more powerful model work? Thanks!