Key Numbers #1 Cylinder #2 Crankshaft w/Rods #3 Crankcase #4 Piston #5 Ring #6 Electronic Ignition System #7 Left Muffler (one external mounting hole) #7 Right Muffler (two external mounting holes) #8 Carburetor Complete #9 Engine Mount #10 Spark Plug #11 Reed Valve #12 Inner Bearing #13 Front & Rear Bearing #15 Carburetor Heat Block #16 Carburetor Base #17 Prop Washer #18 Crankshaft Extension #19 Prop Hub #20 Piston Pin Retainer #21 Screw Set #22 Woodruff Key #23 Piston Pin #24 Needle Bearing #25 Cylinder/