ElectroMaax Yanmar JH Series Serpentine Pulley Kits

Our Serpentine Pulley Upgrade Kits at a Glance
    Permanent Solution to Belt Dust: ElectroMaax Serpentine Pulley Upgrade Kits provide are a lasting solution to belt dust buildup on boat engines, and suitable for a wide range of brands including Yanmar, Volvo, Nanni, and many more.
    Increased Alternator Output: These kits allow for a substantial increase in alternator output without risking damage to the engine or electrical system, promoting optimal engine load during idle.
    Compatibility with High-Output Alternators: Designed to work in conjunction with ElectroMaax High-Output Marine Alternators, ranging from 100 to 250 amps.
    Wide Range of Engine Compatibility: Kits are developed for most Yanmar marine engines from the mid-1970s to current models and include a tensioning-arm for easy belt tensioning. Kits for other popular marine engines are also available or in development.
    Amperage Increase and Fuel Savings: The upgrade can nearly triple your alternator's amperage, reducing fuel consumption by 60%, leading to significant savings and a quick return on investment.
    Extended Vessel Range: By reducing fuel consumption, the Serpentine Pulley Kits significantly increase the cruising range of the boat, allowing longer stays in remote locations.
    Enhanced Performance and Durability: The serpentine 10-rib belt offers smooth operation and better traction, while the machined 6061 aluminum structure and corrosion-resistant anodizing ensure strength and longevity.

Most Name Brand Alternators Fit
We have developed Serpentine (multi grooved) Pulley Upgrade Kits for most Yanmar marine engines from the mid 1970s and all current models. In addition, we have also developed a tensioning-arm for all JH, GM, QM and YM Yanmar series engines and most Nanni marine engines. This simple device makes tensing the belt easy, no need for screw drivers or large wooden sticks to help position the alternator and can be purchased separately. Kits for other popular brands of marine engines are either available or are currently under development.