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Published on May 31, 2013
Converting 121cc rusi to a 149cc using larger crankshaft and bore kit from alternate engine version for cruiser bike. This was a straight parts sway with no difficulty, the head on this bike has exceptional ports we didnt need to port for the engine size they flow plenty of air. the original motor setup left the piston well below the bore top, but using the new crank brought the motor right in line with what would be a normal position. this is a 51mm stroke with 61mm bore.