romeo
Addicted to ArboristSite
Forget about trying to find a new 54mm Jonsered 2083 piston. This is my usual bad photography BTW but it should get the point across.
This is a modded 066 piston, the crown was around .035" taller from the pin with the overall height being about .015 taller. I chucked it up in the lathe and cut a dome top in it. Now it will clear and push a ton of compression without any milling. As for the cylinder porting, nothing special, I raised the exh. duration about 7 degrees and widened the ports. I will slap it back together this weekend and port the muffler, it should be a real runner.
This is a modded 066 piston, the crown was around .035" taller from the pin with the overall height being about .015 taller. I chucked it up in the lathe and cut a dome top in it. Now it will clear and push a ton of compression without any milling. As for the cylinder porting, nothing special, I raised the exh. duration about 7 degrees and widened the ports. I will slap it back together this weekend and port the muffler, it should be a real runner.