The new Yamaha 425-hp engine pushes the envelope wider on the size of boats that can now use outboard power. Not surprisingly a number of our members have asked how much this engine costs and how much it weighs.
Question #1: How much does the new Yamaha 425 engine cost?
Answer: We’re told that retail pricing for the Yamaha XTO 425 will start at $44,250 for the 25-inch shaft in right rotation and $45,185 in left rotation. The 30-inch shaft will retail for $45,000 (right) and $45,935 (left). The 35-inch model will be $46,120 (right) and $47,060 (left).
Question #2: How much does the new XTO Yamaha engine weigh?
Answer: The 25-inch shaft version weighs 952 lb. (432 kg), the 30-inch unit weighs 977 lb. (443 kg), and the 35-inch model weighs 999 lb. (453 kg), dry.
While these weights may seem high for an outboard engine, so is the horsepower. Yamaha points out that the horsepower-to-weight ratio of the new XTO is actually better than its 350 5.6L V8 which has been on the market for a number of years – 2.24 for the 425 vs. 2.18 for the 350. The lightest version of the 350 weighs 763 lb.
Comparison: It also should be remembered that these engines are replacements for gas and diesel sterndrive or inboard engines. For example, the popular 435-hp Volvo Penta D-6 diesel weighs 1,541 lbs. (697 kg), and the 430-hp MerCruiser 8.2 L V8 gas engine weighs 1,122 lbs. (509 kg). Looked at from this perspective, plus the fact that these engines will be going on 30,000 lb. (13,608 kg.) boats indicates that raw weight will not be the issue. Rather, trim, torque, prop geometry, and stern access will be more important considerations.
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