KSJED Marine Flo-Torq II Hub Kit for Mercury 60–300 HP — Replacement 835257Q1, Reduces Vibration & Shifting Noise

KSJED Marine Flo-Torq II Hub Kit (replacement for 835257Q1 / 835257K1) is a complete propeller hub assembly designed to reduce shifting noise and prop rattle while transferring engine torque smoothly to compatible Mercury and MerCruiser drives.

This hub kit is engineered for a wide range of outboards and stern drives, including Mercury 60–300 HP models, Verado 200–300 HP, and MerCruiser Alpha and Bravo One units. It replaces OEM part numbers 835257Q1 and 835257K1 and includes the forward thrust washer, drive sleeve, aft adaptor, tab washer and propeller nut—everything needed to restore a Flo-Torq II style hub system. The design helps dampen vibration and protect the propeller and shaft from shock loads without altering propeller fitment for compatible models.

Which engines and propellers will this hub kit work with?

This kit fits many Mercury/Mariner outboards and MerCruiser stern drives across a broad horsepower range. It covers Mercury 60–300 HP, select Verado and MerCruiser applications, and is compatible with propellers that accept Flo-Torq II hubs.

• Fits Mercury 60–300 HP and Mariner equivalents
• Compatible with Verado 200–300 HP (not for Verado V8 with 1.25" prop shafts)
• Fits MerCruiser Alpha & Bravo One sterndrives (120–375 HP)
• Works with 13 1/4×17 and 14 1/2×19 propeller sizes and Michigan Wheel/Mercury interchangeable props

How does installing this hub kit affect noise, vibration, and shifting?

The Flo-Torq II design provides cushioning between the propeller and the drive, which reduces propeller rattle and clutch engagement noise. You should notice smoother power transfer and fewer abrupt shocks during gear changes, especially under load or when reversing.

• Reduces shifting clunk and propeller vibration
• Dampens torsional shock to protect drivetrain components
• Improves perceived drive smoothness during acceleration and deceleration

What components are included and are they OEM-equivalent?

The kit ships complete with the parts needed to rebuild a Flo-Torq II hub assembly, matching common OEM layouts without requiring additional parts for most installations. It is supplied as a replacement for OEM reference numbers 835257Q1 and 835257K1.

• Forward thrust washer, drive sleeve, aft adaptor included
• Tab washer and propeller nut provided for secure installation
• Built to fit standard Flo-Torq II propellers—no machining required

Are there fitment exceptions or installation notes I should know?

While the hub system fits a wide selection of engines and props, it is not universal. Verify shaft diameter and propeller compatibility before purchase; the kit is not compatible with Verado V8 engines using 1.25" prop shafts.

• Not for Verado V8 with 1.25" propeller shafts
• Confirm spline count (15-spline) and prop acceptance of Flo-Torq II
• Check prop dimensions (13 1/4×17 and 14 1/2×19 examples) for fit

Who is this for: This KSJED Flo-Torq II hub kit is aimed at boat owners, mechanics and marine service shops that need a reliable replacement hub for Mercury and MerCruiser outboards and stern drives. If you operate a vessel with Flo-Torq II-compatible propellers and want to cut down on drivetrain noise, protect your prop and shaft from sudden shock loads, or restore factory-style engagement performance, this kit provides the essential parts to complete the repair.