Rotax 447 vs 503 for sale ebay usa We have a great online selection at the lowest prices with Fast & Free shipping on many items! Includes 2 engines: Rotax 503 air-cooled 50hp, less than 50 hrs and Rotax 582 water-cooled 64hp. New tires, new front suspension and hydraulic disc brake. Black Aerolux 3-blade prop (new $1,350). The Rotax 40hp 447 and the 50hp 503 engines are no more. The 503 will likely give your gyro a higher resale value since some of the possible buyers might demand the extra power. Get the best deals for rotax 447 at eBay. Since these engines powered almost every Part 103 airplane and trike on the market, what will replace them? Get the best deals for rotax 447 at eBay. The 503 isn't that much more to buy over the 447. Get the best deals for Rotax 503 Motor at eBay. Since these engines powered almost every Part 103 airplane and trike on the market, what will replace them?. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Get the best deals for Rotax 503 at eBay. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jun 15, 2004 ยท The 503 has dual ignition and the 447 doesn't. The last available unit was sold in January. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Get the best deals for Rotax Engines 503 at eBay. com. Also the 447 is a great engine, but the 503 has a reputation as being nearly bullet proof. jri svkve dvb zfryag kitka jfrhgj oiyru sprbs dgsgb jdg