CALL NOW FOR DAILY PRICING SPECIALS! The Mercury 9.9 HP Outboard motor with 25 inch extra long shaft and Command Thrust delivers power, thrust, and control that wider, heavier boats need. A larger prop increases control and a taller gear case puts the propeller deeper below turbulent water for improved power. The Mercury 9.9 outboard engine is the right choice for sailboat and kicker applications. The 9.9 HP Mercury Outboard Motor model: 9.9MXLH-CT is an affordable outboard equipped with an extra long 25 inch shaft and manual start, Mercury’s 3 year factory warranty, auto ratchet trim, and multi function tiller control.