Man,...that 32cc inline is a Sweet looking mill !! Pricey, but compared to the M90's cost... it's a $teal with all the functional detail, liquid pumps, absolutely Beautiful Radiator & that really cool ignition Distributer !! I'm sure the metallic piston Ring upgrade will improve issues but u might check out the cyl bores for correct Crosshatch Hone Finish to achieve optimum ring break-in....I would hit the "Buy" button, but I'm in middle of full scale muscle car engine build & Need to keep budget & time focused on getting the 426H project runnin......tom.