Stock Number Mfr Number Product Description Optional  MACG1651  1651  Macs Enya 90/O.S. FS-70/91 Adapter Optional  OSMG7372  24881824  O.S. O-Ring IV/PRC #6H    OSMG3060  26731002  O.S. Front Bearing .40-240    OSMG9360  29008219  O.S. Woodruff Key .61-.91    OSMG8988  45061202  O.S. Tappet Screw F40-300    OSMG3212  45231100  O.S. Camshaft Bearing F 40-120    OSMG8360  45361000  O.S. Rocker Arm Assy F61-300    OSMG8416  45361100  O.S. Rocker Arm F61-300    OSMG3074  45530030  O.S. Rear Bearing FS 1.20 III    OSMG3196  45564000  O.S. Cam Follower .91-300    OSMG3852  45581700  O.S. Carburetor Screw FS61-FT300    OSMG4012  45605000  O.S. Connecting Rod FS-61/91    OSMG8376  45761600  O.S. Rocker Arm Retainer FS-20-240    OSMG3152  45771000  O.S. Breather Nipple FS-20/40    OSMG7574  45903200  O.S. Piston FS-91 Surpass/FT-160    OSMG5136  45904110  O.S. Cylinder Head FS-91-P    OSMG7742  45906000  O.S. Piston Pin FS-91 Surpass    OSMG4069  45907020  O.S. Cover Plate FS-91 Surpass II    OSMG5598  45908000  O.S. Drive Washer FS-91 Surpass    OSMG6687  45910100  O.S. Locknut Set FS-91 Surpass    OSMG8814  45913000  O.S. Screw Set FS-91 Surpass    OSMG2874  45925010  O.S. Muffler Assembly #F-4020    OSMG6784  45925100  O.S. Silencer Body #F-4020    OSMG2718  45926000  O.S. Exhaust Pipe Assembly #F-4020    OSMG9218  45960000  O.S. Valve Assembly Intake FS-91 Surpass    OSMG9219  45960010  O.S. Valve Assembly Exhaust FS-91 Surpass    OSMG9186  45960100  O.S. Valve Intake FS-91 Surpass    OSMG9187  45960110  O.S. Vavle Exhaust FS-91 Surpass    OSMG9242  45960200  O.S. Valve Spring FS-91 Surpass    OSMG9241  45960210  O.S. Valve Spring FS-70 SII    OSMG9231  45960300  O.S. Valve Spring Retainer FS-91 Surpass    OSMG9245  45960310  O.S. Valve Spring Retainer FS-70 SII    OSMG9227  45960400  O.S. Valve Collet FS-91 Surpass    OSMG8401  45961400  O.S. Rocker Arm Support Assy FS91-240    OSMG8407  45961410  O.S. Rocker Arm Support .91-240    OSMG3255  45962010  O.S. Camshaft FS-91-P    OSMG8102  45966000  O.S. Pushrod FS-91 Surpass    OSMG7446  45966100  O.S. Pushrod Cover Assembly FS-91 Surpass    OSMG7410  45966110  O.S. Pushrod Cover FS-91 Surpass    OSMG6493  45968200  O.S. Intake Manifold Assembly FS-91 Surpass II    OSMG5782  45968210  O.S. Intake Manifold FS-91 Surpass II    OSMG2432  45984000  O.S. Carburetor #60P FS-91 Surpass II    OSMG5388  46103100  O.S. Cylinder Liner F91/160/320    OSMG9136  46120000  O.S. Thrust Washer FT-120/160    OSMG2692  71615009  O.S. Type F Glow Plug 4-Stroke Medium Optional  OSMG2687  72108120  O.S. Flex Pipe 1111C .70/.91 Surpass Optional  OSMG2689  72108130  O.S. Flex Pipe 1111D .70/.91 Surpass Optional