Summary: cross-reference of genuine Rotax 912UL / 912ULS / 914UL spare parts to cheaper automotive or aftermarket parts that I believe are the same, with notes on fitment.
Rotax 912ul (80 hp), 912uls (100hp), 914(115 hp turbo) are common engines in ultralight aircrafts. Spare parts are relatively expensive, and as life goes on, I decided to list alternative sources with what I believe are the same spare part as used by genuine Rotax.
| Part | Rotax P/N | Alternative / identical part | Notes |
|---|---|---|---|
| Radiator cap with gasket, 1.2 bar (912/914) | 922072 | BMW radiator cap 17112345074 | Alternative product |
| Electric fuel pump, 914 (1.0 bar) | 996738 | PIERBURG 7.21440.78.0 | Identical product |
| Electric fuel pump, 912 (0.15 bar) | — | PIERBURG 7.21440.53.0 | |
| Mechanical fuel pump, 912 | 893115 | PIERBURG 7.02242.32.0 | This pump lacks the mandatory drain plug. Need to add nipple. |
| Hydraulic valve lifters | 881832 | Ford Melling JB-900 engine valve lifter | Identical product |
| Ignition modules | 965359, 965446, 966724, 965440, 966728, 965442, 966729, 965444 | Ignitech ignition unit for Rotax 912 and 914 | Alternative product |
| Spark plug connector | 265249 | NGK VD05FMH spark plug cap | Identical product |
| Carburetor floats | — | AliExpress carburetor float for Bing 64/32/54 (Rotax 912/914) | Alternative product. Initial weight is more than original Rotax, but after 6 months in E10 fuel, no sign of weight gain and less than 3.5 g each. |
| Engine shock mount | 860690 | LORD J3608-1 mount | Identical product |
Documentation
Latest documentation will easilly be found at www.rotax-owners.com for free. Unfortunately, some information found in older catalogs are removed from the newer ones, such as what torque should be used on some bolts. For reference, here’s a copy of 2013 Rotax 912/914 illustrated parts catalog.
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