A first-rate choice for trainers, sport planes and scale aircraft!
The versatile 65AX ABL from O.S. makes a great power plant for trainers, sport planes and scale aircraft – and best of all, it mounts in the same space as the popular 61FX ABL for easy drop-ins! Includes a newly designed 61D carburetor, an E-4010A muffler, #8 glow plug and needle extension cable set.
- Mounts in the same space as the 61FX ABL for easy drop-ins.
- Newly designed 61D carburetor features an angled needle for safety.
- Includes an E-4010A muffler, #8 glow plug & needle extension cable set.
- Compatible with the ultra-quiet, ultra-compact E-4050 muffler.
Key Features
- Ideal for trainers, sport planes and scale aircraft
- Drops in easily in the same mounting space as the O.S. 61FX ABL
- ABL-Advanced Bi-Metallic Liner process uses a double layer of plating material rather than one thick layer. This helps the metal bond to the cylinder and makes the plating more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve for better compression and longer life.
- Newly designed 61D carburetor with a rearward angled needle valve for safer adjustments
- Two year limited warranty through Hobby Services beginning at date of purchase
Product Specifications
| Manufacturer # | 16521 |
| Cylinders | Single |
| Product Width | 2.4″ (60mm) at mounting tabs |
| Product Height | 3.1″ (78.5mm) crankcase bottom to top of cylinder head |
| RPM Range | 2,500 – 16,000 |
| Crankshaft Threads | UNF5/16-24 |
| Muffler Weight | 17.53 oz (497 g) |
| Engine (Only) Weight | 17.5 oz (497 g) w/o muffler |
| Muffler Type | 2-piece aluminum |
| Displacement | 0.65 cu in (10.6 cc) |
| Oil Type & Content | At least 18% synthetic lubricant |
| Product Length | 3.7″ (93.3mm) from back plate to front of drive hub |
| Bore | 0.95″ (24 mm) |
| Crankshaft Type | Threaded |
| Power Type | Glow |
| Plug Type | O.S. #8 |
| Stroke | 0.93″ (23.5mm) |
| Carb Type | Rotary |






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