Discover reliable choices for a 115 HP outboard to meet performance, durability, and maintenance needs. This guide highlights five products that align with common 115 HP setups, from OEM-compatible alternators to protective covers and essential maintenance parts. The best pick depends on your engine model, usage (saltwater vs. freshwater), and whether you prioritize immediate replacement parts or long-term protection. The following selections are presented with clear rationale to help you compare quickly.
Summary of selected products
| Product | Best for | Notes |
|---|---|---|
| OEG Parts New Alternator (Mercury/Yamaha compatibility) | Electrical replacement for 115 HP models | 12V, 50A, CW rotation |
| OEG Parts Marine Starter (Yamaha compatibility) | Starter replacement for 115 HP builds | 12V, CCW rotation, 9-tooth option |
| GHmarine Water Pump Impeller Kit (Yamaha 75-115 HP) | Maintenance and pump reliability | Includes housing |
| Boat Marine Outboard Motor Cover (Mercury/Yamaha/Honda 100-150 HP) | Engine protection when stored | Heavy-duty 89” x 75” sizing |
| DETYI Transom Saver (4-stroke Mercury) | Trailering protection for 115 HP class | Stainless steel, rubber buffers |
OEG Parts New Alternator for Mercury/Yamaha 115 HP
This replacement alternator is designed for 12V systems with 50A output and CW rotation. It lists compatibility with several Mercury and Mariner 115 HP families and multiple older 4-stroke variants. Best for: technicians replacing a failing charging unit on 115 HP Mercury/Mariner or compatible Yamaha builds. Limitations: mounting hardware is not included, so you may need to source brackets or hardware separately. The part numbers cover a broad range of compatible models for easier cross-checking.
OEG Parts New Marine Starter for Yamaha 115 HP
This marine starter is listed for Yamaha outboards from 1984 to 2002 in 115/130/150/175 HP ranges. Best for: owners upgrading a starter in older Yamaha 115 HP class engines to restore reliable cranking. Better for: installations where a CCW starter rotation and specific mounting patterns match the Yamaha models cited. Caution: verify exact model year and mounting compatibility, as the listing spans multiple generations.
GHmarine Water Pump Impeller Kit for Yamaha 75-115 HP
This impeller kit includes a housing and is designed for Yamaha 4-stroke 75-115 HP motors. Best for: routine maintenance to prevent overheating and ensure reliable cooling, especially on older Yamaha engines. Choose this for preventative service during mid-season maintenance. Limitation: confirm the exact water-pump model fitment for your specific Yamaha year and model, as part numbers reference several 68V-W0078 variants.
SeaSierra Boat Marine Outboard Motor Cover 100-150 HP
This cover protects engines across 100-150 HP categories, made from 600D oxford fabric with a PVC coating. Best for: long-term storage or mooring protection to shield the cowling from sun, sand, rain, and scrapes. Better for: owners who want a universal fit for multiple brands (Mercury, Yamaha, Honda, etc.). Caution: horsepower is a guideline for fit; measure your motor to ensure appropriate coverage. The listed dimensions help verify compatibility.
DETYI 4-Stroke Transom Saver for 75–300 HP
This transom saver supports 75/90/115/200/225/250/300 HP engines and new V6 175 HP units, with a stainless steel frame and rubber buffers. Best for: protecting the transom during trailering and preventing damage to hydraulics or seals. Choose this if you frequently trailer your boat. Limitation: not compatible with Mercury Verado or non-Mercury single-brand setups; verify engine brand compatibility before purchase.
Buying Guide
What to consider when choosing a 115 HP outboard accessory
- Engine compatibility: Confirm model years and horsepower alignment with your specific 115 HP engine to avoid misfit parts.
- Installation essentials: Some items require mounting hardware or professional installation. Check what’s included.
- Purpose: Determine whether you need a replacement electrical part, a maintenance kit, a protective cover, or a trailer accessory.
- Operating environment: Saltwater use may necessitate corrosion-resistant components and protective covers with better water exposure resistance.
- Durability and fit: Look for durable materials (e.g., stainless steel, 600D fabric with PVC coating) and measure dimensions for covers and guards.
How to compare products quickly
- Best for: Identify the primary use — electrical, starter, cooling, protection, or transom protection.
- Limitations: Note whether mounting hardware is included or if compatibility is limited to certain brands or years.
- Maintenance cycle: Maintenance parts like water pump kits should align with your service schedule and engine age.
Frequently asked questions
- What should I replace first on a 115 HP outboard?
Replacement parts like starters, alternators, and water pumps are common first-maintenance items when reliability is a concern. - How do I verify compatibility with my specific engine year?
Check the listed part numbers and cross-reference your engine’s year, model, and brand. If in doubt, consult the engine’s service manual or a professional technician. - Is a transom saver essential for trailering?
It helps reduce stress on the transom and seals during road travel, especially for long trips or rough roads. - Can I use a universal engine cover for different brands?
Yes, but measure your motor’s dimensions and confirm fit for your exact horsepower and mounting configuration to prevent loose coverage or improper protection.