Posted 4 Sep 2016 (edited) My stepson said he just bought a Rotax 717 - WAT-IZ-IT? (Will it fly? But he didn't buy it for that) any info appreciated. EDMO Edited 4 Sep 2016 by EDMO Share this post Link to post Share on other sites
Posted 4 Sep 2016 its a watercraft engine. a quick google search will tell you more than you need to know Share this post Link to post Share on other sites
Posted 4 Sep 2016 its a watercraft engine. a quick google search will tell you more than you need to know Thanks Leni - Guess I need to learn how to "Google"! Ha! Ed Share this post Link to post Share on other sites
Posted 22 Oct 2018 My stepson said he just bought a Rotax 717 - WAT-IZ-IT? (Will it fly? But he didn't buy it for that) any info appreciated. EDMOit's a Seadoo Jet Ski/Boat Engine 717/720 (82mm x 68mm) 718.5cc. I have never seen anyone convert any of the older Seadoo Engines for Airplane use, 580/587, 650/657, 717/720, 787/800. But some parts do switch with Skidoo/Rotax. It could be done, but a lot of R&D Time & $$$ to convert one. If you left it Single ignition and could Hang it Upside Down you could use an Old Belt Drive. Seadoo's use a Threaded PTO. You would have to Block Off the Exhaust Cooling Holes and make a different WYE Pipe Flange.Rotax Rick's 670(669cc) is 93hp@6350rpm. 669cc/93 = 7.2cc to make 1hp. So 718cc/7.2cc = 99.7hp@6350rpm. With Tuned Pipes, different Size Carbs, HP can very greatly.670(78mm x 70mm) 669.2cc 11.5cr have been Big Bored to (82.5mm x 70mm) 748.6cc is the largest you can go on the 670. Stock Standard 670 was 115.7hp@7750rpm in a Sled. The 670HO 12.5cr was about 15-20hp more at same 7750rpm. Share this post Link to post Share on other sites