Tips for Repowering Older Boats

Tips for Repowering Older Boats
The 2002 model year is noted for one event that changed the way that outboard boats were designed and powered: Yamaha's F200/F225 V-6 hit the market.
Tips for Repowering Older Boats
Repower Problems
Pick the wrong engine to repower your boat, and you could be in for these troubles. Always contact the boatbuilder prior to repowering. 1. Loss of ability to self-bail
2. Possible swamping with open transoms
3. Porpoising
4. Slow planing
5. Poor visibility forward
Tips for Repowering Older Boats
Scuppers above the waterline ensure drainage. Wide chines are one way to help float heavier power. Brackets with more immersion provide more buoyancy.
Tips for Repowering Older Boats
Heavy Hitters
Weight and torque ramped up when Honda and Yamaha debuted new four-stroke outboards. 2002
Boaters were ready but some boats were not.
Two-strokes by Evinrude, Mercury thrive. 2014
Four-stroke engines are lighter.
Boats are designed for new engines.
Tips for Repowering Older Boats
Current Two-Stroke Offerings
For the 2014 model year, two-strokes remain a viable power option, but with fewer models than their four-stroke
counterparts. Evinrude is “all in” with its E-TEC direct-injection two-stroke lineup.
Tips for Repowering Older Boats
Mercury offers its proven OptiMax direct-injection two-stroke outboards.
Tips for Repowering Older Boats
Yamaha has scaled down to only two HPDI (high-pressure direct injection) two-stroke models.
Tips for Repowering Older Boats
Seven Marine's 557 can provide another repowering option for older boats, those designed and built before about 2002.