Mercury Force 90 H.P. 1990, Power Head - parts catalog
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Power Head
(1990) - 903F90A, 903X90A, 906A90A, 906F90A, 906X90A, 908F90A, 908X90A| Parts Diagram | ## | Part # | Description | Qty | Notes |
 | 2 | 11-F7009 | Lock nut, #10 - 24 | 1 | |
| 3 | 10-47688 | Hex bolt, 3/8 - 16 x 2-3/4 | 1 | replaces F1009 | |
| 4 | 12-37828 | Plain washer | 4 | replaces F8038 | |
| 5 | 10-53734 | Hex bolt, 3/8 - 16 x 3 | 4 | replaces F1873 | |
| 6 | 11-F1346 | Hex nut, 3/8 - 16 | 1 | ||
| 7 | 12-20553 | Plain washer | 14 | replaces F8095 | |
| 8 | 10-28636 | Hex hd. screw, 1/4 - 20 x 3/4 | 9 | replaces F1864 | |
| 9 | 16-8263942 | Stud | 1 | replaces F85210 | |
| 10 | 17-20433 | Dowel pin | 2 | discontinued, replaces F8563 | |
| 11 | F698122 | Seal, parting line | 1 | ||
| 12 | 16-F85859 | Stud, forward | 4 | discontinued | |
| 13 | 10-F1504 | Fill hd. screw, 1/4 - 20 x 1-1/4 | 2 | ||
| 14 | 10-32132 | Hex bolt, 3/8 - 16 x 1-3/4 | 2 | replaces F1872 | |
| 15 | 10-14168 | Hex cap screw, 1/4 - 20 x 1 | 1 | replaces F1199 | |
| 16 | 11-20110 | Stop nut | 2 | replaces F1804 | |
| 17 | 819002 | Throttle link | 1 | replaces F85502 | |
| 18 | 828514A1 | Ball joint w/stud | 1 | replaces 8177471 | |
| 19 | 817968A2 | Towershaft | 1 | discontinued | |
| 20 | 10-F1829 | Fill hd. screw, 10 - 24 x 7/8 | 2 | discontinued | |
| 21 | 10-F1504 | Fill hd. screw, 1/4 - 20 x 1-1/4 | 1 | ||
| 22 | 11-64015 | Hex nut, 1/4 - 20 | 1 | replaces F1341 | |
| 23 | 10-F2217-1 | Fill hd. screw w/lock washer 10 - 24 x 3/8 | 2 | replaces F2217 | |
| 24 | FK405020 | Swivel w/pivot screw and nut | 2 | discontinued | |
| 25 | 17-F1727 | Plastic rivet | 1 | discontinued | |
| 26 | 1 | Towershaft control rod end | 1 | replaces F499036 | |
| 27 | F499026 | Swivel | 2 | discontinued | |
| 28 | 22-F84314-2 | Elbow | 1 | discontinued | |
| 29 | 1 | Rod, spark control | 1 | replaces F85445 | |
| 30 | 11-F2015 | Hex nut, 1/4 - 28 | 1 | ||
| 31 | 12-89302 | Plain washer | 2 | replaces F2042 | |
| 32 | F499035 | Rod end, control rod to trigger | 1 | ||
| 33 | 11-68411 | Stop nut, 3/18 - 16 | 10 | limited availability, replaces F7004 | |
| 34 | 27-F85748-2 | Gasket, cylinder drain reed plate | 1 | ||
| 35 | 35-F93811 | Screen | 3 | discontinued | |
| 36 | F2A404757 | Cylinder drain reed plate | 1 | discontinued | |
| 37 | 34-F18160-3 | Reed | 3 | ||
| 38 | F93920 | Reed stop | 3 | discontinued | |
| 39 | 12-18552 | Plain washer | 3 | replaces F8003 | |
| 40 | 10-F1286 | Pan hd. screw, 4 - 40 x 3/16 | 3 | discontinued | |
| 41 | 27-F85472-2 | Gasket, cylinder drain cover | 1 | ||
| 42 | 817787A1 | Cylinder drain cover | 1 | w/plug and literature original Force p/n A404471-1 | |
| 43 | 10-819110100 | Hex hd. screw, 1/4 - 20 x 1 | 6 | replaces F1532 | |
| 44 | 22-F404801 | Fitting | 1 | discontinued | |
| 45 | 32-81902962 | Hose | 1 | discontinued, replaces F433253 | |
| 46 | 10-98254 | Hex hd. screw, 1/4 - 20 x 5/8 | 3 | replaces F1502 | |
| 47 | 817790A1 | Transfer port cover | 2 | discontinued w/plugs and literature original Force p/n A411222-1 | |
| 48 | 27-820500A3 | Gasket, transfer port cover | 3 | replaces F40223 | |
| 50 | 2 | Bracket, remote cable | 1 | replaces FS85872-1 | |
| 51 | 16-F98273 | Rod end connector stud | 2 | limited availability | |
| 52 | 10-28636 | Hex hd. screw, 1/4 - 20 x 3/4 | 2 | replaces F1864 | |
| 53 | 27-819381 | Cylinder exhaust gasket, upper | 1 | replaces F85279-2 | |
| 54 | 10-F369887 | Shoulder screw | 1 | discontinued | |
| 55 | 23-F369610 | Bearing | 1 | discontinued | |
| 56 | 10-F1885 | Hex bolt, 5/16 - 18 x 4-1/4 | 1 | discontinued | |
| 57 | 2 | Cam, starter interlock | 1 | replaces F480107-1 | |
| 58 | 10-F2089 | Slotted pan hd. machine screw, 10 - 24 x 5/16 | 2 | discontinued | |
| 59 | 11-F2108 | Stop nut, 5/16 - 18 | 1 | discontinued | |
| 60 | 23-97896 | Bearing | 2 | replaces F85610 | |
| 61 | 11-814101 | Stop nut, 1/4 - 20 | 1 | replaces F1832 | |
| 62 | FA480876 | Gear shift arm | 1 | ||
| 63 | 8199321 | Interlock arm | 1 | replaces F369977-1 | |
| 64 | 10-37612 | Hex bolt, 3/8 - 16 x 1-1/4 | 6 | replaces F1869 | |
| 65 | 13-35048 | Spring lock washer | 6 | replaces F1703 | |
| 66 | 23-F40689-1 | Bearing, towershaft | 1 | discontinued | |
| 67 | 819750A1 | Spacer plate | 1 | discontinued, replaces FA692680 | |
| 68 | 22-F2090 | Plug | 1 | discontinued | |
| 69 | 1 | Gasket set | 1 | replaces FG1028 | |
| - | 27-820500A3 | Transfer port cover gasket | 3 | replaces F40223 | |
| - | 26-F664914 | Seal, thermostat | 1 | ||
| - | F698122 | Crankcase seal | 1 | ||
| - | 27-8190231 | Exhaust port plate gasket | 2 | replaces F692154-1 | |
| - | 27-F85159-1 | Manifold gasket | 1 | ||
| - | 27-F85168-2 | Carburetor adapter flange gasket | 3 | replaces F85168-1 | |
| - | 27-819381 | Cylinder, exhaust - upper gasket | 1 | replaces F85279-2 | |
| - | 27-F85472-2 | Cylinder drain cover gasket | 1 | ||
| - | 27-F85748-2 | Cylinder drain reed plate gasket | 1 | ||
| - | 27-F85762 | By-pass valve gasket | 1 | ||
| - | 27-828925 | Carburetor gasket | 3 | replaces F85906 | |
| - | 2 | Cylinder head gasket | 1 | replaces F369529-1 | |
| - | 27-828319 | Thermostat cover gasket | 1 | replaces F476067 | |
| - | 27-F481836 | Intake gasket | 3 | ||
| 70 | 33-896329824 | Spark plug Champion UL-18-v | 3 | replaces FS467227 | |
| 71 | 12-34437 | Plain washer | 14 | replaces F1987 | |
| 72 | 10-F1883 | Hex bolt, 5/16 - 18 x 2-3/8 | 14 | ||
| 73 | 1000-F692995 | Cover, cylinder head | 1 | ||
| 74 | 2 | Thermo switch | 1 | replaces F629449-1 | |
| 77 | 10-20540 | Fill hd. screw, 1/4 - 20 x 5/8 | 4 | discontinued, replaces F1110 | |
| 78 | 819693 | Cover, thermostat | 1 | replaces F476066-1 | |
| 79 | 26-F664914 | Seal, thermostat | 1 | ||
| 80 | F664068 | Thermostat 130EF | 1 | ||
| 81 | 27-828319 | Gasket, thermostat cover | 1 | replaces F476067 | |
| 82 | 900-803933T | Head, cylinder | 1 | replaces F630518-1 | |
| 83 | 22-47945 | Plug | 1 | replaces F19109 | |
| 84 | 2 | Gasket, cylinder head | 1 | replaces F369529-1 | |
| 85 | 16-826391 | Stud, rear | 6 | discontinued, replaces F693211-1 | |
| 86 | 37-F529398-1 | Decal, wiring | 1 | discontinued | |
| 87 | 10-76213 | Hex hd. screw, 1/4 - 20 x 1-1/8 | 21 | replaces F1709 | |
| 88 | 10-F901938-1 | Hex hd. screw, 1/4 - 20 x 7/8 | 2 | discontinued | |
| 89 | 803932T | Cover, exhaust port | 1 | discontinued, replaces F692152 | |
| 90 | 27-8190231 | Gasket, exhaust port plate | 2 | replaces F692154-1 | |
| 91 | 1000-8192831 | Plate, exhaust port | 1 | replaces F692151 | |
| 97 | 800-819080A6 | Cylinder w/cover | 1 | discontinued, replaces FA692010 | |
| - | 800-817608A22 | Short block not shown | 1 | discontinued, replaces FC692010 | |
| 98 | 10-F2008 | Hex cap screw, 1/4 - 20 x 7/8 | 2 | discontinued | |
| 100 | 10-39349 | Hex cap screw, 5/16 - 18 x 3/4 | 1 | replaces F2000 | |
| 101 | 13-53166 | Spring lock washer | 1 | replaces F8096 | |
| 102 | FA607689 | Bearing towershaft lower | 2 | discontinued | |
| 103 | 53-F428096 | Retainer, thermo switch | 1 | ||
| 104 | 24-F664268 | Spring, thermostat | 1 | ||
| 105 | 37-F694366-1 | Medallion, "US Marine" | 1 | discontinued, replaces F694366 |
Parts list covers the following S/N:
903F90A, 903X90A, 906A90A, 906F90A, 906X90A, 908F90A, 908X90A
