very smooth, had it balanced before final assembly, next time i will find `a50 flywheel. the crank was us as on -040 and scored, i reground to triumph size std and fitted t120 rods, better then the all alloy ones as had the steel rear half of conrod, the trident pistons had pins higher up so the 1/2 longer rod only pushed piston 3mm through top of barrel. worked out well really
another project i am on with, is a7 with std crank, and a7 barrel to take a10 pistons, so being more square engine should rev better, got spitfire cam, twin carb head, in a royal enfield frame, should be running april may