Rotax 912 crankshaft, Rotax 914 crankshaft, Rotax pistons and parts diagram.

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CRANKSHAFT, PISTON, CYLINDER AND FREE-WHEEL

No. Part# Description 912UL 912A 912F 912ULS 912S 914UL 914F
1 996 583 Crankshaft set 1a 1a 1a 1a 1a
888 164 Crankshaft set 1i 1i 1i 1i
2 834 120 Free wheel gear 50T 1 1 1 1 1 1 1
3 933 310 Bearing bushing 1 1 1 1 1 1 1
4 852 400 Sprag clutch housing 1 1 1 1 1 1 1
5 958 856 Sprag clutch 51.710x68.377x13 1 1 1 1 1 1 1
6 845 420 Circlip 68 1 1 1 1 1 1 1
7 842 570 Hex nut M34x1.5LH 1 1 1 1 1 1 1
8 996 548 Piston assembly 79.5/79.51mm 4b 4b 4b
996 549 Piston assembly 79.5/79.51mm 4c 4c
888 381 Piston assembly 84/84.01mm 4d 4d
9 215 400 Oil scraper ring 79.5mm 4 4 4 4 4
815 230 Oil scraper ring 84/76.5x3 4 4
10 215 420 Tapered compr ring 79.5mm 4 4 4 4 4
815 280 Tapered compr ring 84/77x1.25 4h 4h
11 215 590 Rectangular ring 79.5/72.9/1.5 4 4 4 4 4
815 251 Rectangular ring 84/77x1.5 4h 4h
12 916 355 Piston pin 20x13.4/15.8x56 4 4 4
916 420 Piston pin 20x12x56 4 4
916 356 Piston pin 20x12x55.3 4 4
13 845 106 Monohook circlip 20 8e 8e 8e 8e 8e 8e 8e
14 250 510 O ring 87x2 4 4 4 4 4 4 4
15 913 220 Cylinder 4f 4f 4f 4f 4f
913 221 Cylinder 4f 4f 4f 4f 4f
913 225 Cylinder 4g 4g
a Stroke is 61mm, parts are marked with serial#
On 914, use only up to 914UL #4417790, 914F #4420163
b, c Red dot - 79.50, green dot - 79.51mm
d Red dot - 84.00, green dot - 84.01mm
e Use only once!
f A-79.50-79.512, B-79.513-79.524
g A-84.00-84.012, B-84.012-84.024
h 912ULS the entire piston has to be exchanged up to #4425123
i Stroke is 61mm, parts are marked with serial#
Introduced as per engine serial# as follows:
914UL 4417791
914F 4420164
912ULS 4425001
912S 4922501
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