1 | 12-554 | HEAD - cylinder (w/ valves) | 1 |
| 12-555 | HEAD - cylinder (w/o valves) | 1 |
| 12-556 | HEAD - cylinder & insert | 1 |
| 12-557 | HEAD - cylinder | 1 |
2 | 11-7154 | INSERT - exhaust valve seat | 4 |
3 | 11-7106 | PLUG - cup | 1 |
4 | 55-6649 | PLUG - pipe | 3 |
5 | 11-7107 | VALVE - intake | 4 |
6 | 11-7108 | VALVE - exhaust | 4 |
7 | 11-7109 | SPRING - valve (intake & exhaust) | 8 |
8 | 11-7853 | SEAL - intake valve | 4 |
| 11-7854 | SEAL - exhaust valve | 4 |
9 | 11-7111 | RETAINER - intake valve | 4 |
10 | 11-7112 | KEY | 16 |
11 | 11-7113 | ROTATOR - exhaust valve | 4 |
12 | 33-2066 | GASKET - cylinder head | 1 |
13 | 55-6650 | STUD - rocker arm & cover support | 2 |
14 | 55-6651 | BOLT - cylinder head | 10 |
15 | 11-7114 | COVER - cylinder head (engine Serial No. suffix X333) | 1 |
| 11-7857 | COVER - cylinder head (engine Serial No. suffix X348, see 91E4) | 1 |
16 | 33-2067 | GASKET - cover | 1 |
17 | 55-6622 | ELBOW - crankcase vent | 1 |
18 | 55-6623 | NIPPLE - crankcase vent | 1 |
19 | 11-7115 | CAP - oil filler | 1 |
20 | 55-6652 | NUT - cylinder head cover | 2 |
21 | 11-7116 | RETAINER - cylinder head cover seal | 2 |
22 | 11-7117 | NUT - cylinder head cover | 2 |