KSJED Flo-Torq II Hub Kit for Mercury & MerCruiser 60–300 HP — Replacement hub, reduces prop rattle

KSJED Marine Flo-Torq II Hub Kit replaces worn hubs to reduce propeller rattle and deliver smoother power transfer for Mercury and MerCruiser drives.

If your outboard or sterndrive is producing clunks, vibration, or noisy shifting, swapping in a fresh Flo-Torq II hub kit can restore quieter operation and more consistent torque delivery to your propeller. This KSJED replacement kit is designed for many Mercury and MerCruiser engines and includes the hardware needed to rebuild the hub assembly on drives that accept Flo-Torq II components.

Which engines and propellers will this hub kit work with?

The kit fits a broad range of Mercury outboards and MerCruiser sterndrives that use Flo-Torq II hubs. It covers common horsepower ranges and several legacy models, plus prop sizes and interchange systems from Michigan Wheel and Mercury.

• Covers Mercury 60–300 HP and Verado 200–300 HP models.
• Compatible with MerCruiser 120–375 HP on Alpha and Bravo One drives.
• Fits specific older Mercury/Mariner models (75 HP 1984+, 90/115 HP 1978+, 125 HP 1994+).
• Works with 13 1/4×17 and 14 1/2×19 props and propellers accepting Flo-Torq II.

What parts are included and what does each part do?

The KSJED kit supplies the core components needed to replace a full hub assembly so you can eliminate play and noise while keeping thrust loads properly aligned. Each item is meant to restore function without replacing the entire prop shaft or drive unit.

• Drive sleeve — transmits rotation from the shaft to the prop hub.
• Forward thrust washer — positions the prop and manages axial load.
• Aft adaptor — secures the hub on the shaft and aligns mating surfaces.
• Tab washer and propeller nut — lock the assembly to prevent loosening at sea.

How does installing this hub kit affect boat performance?

Replacing a worn hub reduces prop slippage and dampens vibration, which improves perceived smoothness and responsiveness. While it doesn’t increase engine horsepower, it helps the propeller receive power more consistently so acceleration and handling feel firmer.

• Reduces shifting noise and propeller rattle for quieter operation.
• Improves engagement between shaft and prop for consistent thrust.
• Helps prevent premature wear on prop and hub components.
• Simple swap replaces multiple worn parts at once for reliable results.

Are there any fitment or compatibility cautions to know?

The Flo-Torq II system has several variations; verify spline count and shaft size before ordering. This KSJED kit is not compatible with some Verado V8 shafts that use a 1.25" diameter—measure the shaft and confirm your prop accepts Flo-Torq II.

• Designed for 15-spline applications; confirm spline count first.
• Not suitable for Verado V8 engines with 1.25" prop shafts.
• Fits propellers from Michigan Wheel and Mercury interchange systems that accept Flo-Torq II.
• OEM cross-references include replacements for 835257Q1 and 835257K1.

Who this kit is for: Boaters, marine mechanics, and service shops replacing a failing Flo-Torq II hub on Mercury outboards or MerCruiser Alpha/Bravo One sterndrives will find this KSJED hub kit a practical, cost-effective rebuild option. It’s ideal when you need quieter shifting, reduced prop vibration, and a full set of hub components in one package — as long as your engine uses the Flo-Torq II interface and isn’t the incompatible Verado V8 shaft size.