K-Tech Fork Slide Bushing Kit for Kawasaki Ninja 400 (2018–2023) GBS-007

Precise fork action is the foundation of fast, consistent lap times, and the K-Tech GBS-007 slide bushing kit delivers exactly that for the Kawasaki Ninja 400 (2018–2023). Replacing the factory fork guide bushings with these hardened-steel, copper and PTFE-coated units eliminates the slop and stiction that blunt feedback on track, restoring the sharp, progressive response that makes the difference between a hesitant entry and a committed one.

Key Features

• Direct OEM replacement for fork guide bushings on the Kawasaki Ninja 400 (2018–2023) — no modification required
• Hardened steel construction with a copper coating for outstanding wear resistance under sustained track use
• PTFE-coated contact surfaces reduce friction to a minimum, giving the fork a smooth, consistent stroke lap after lap
• Complete kit: two bushings supplied to allow a full axle-to-axle service in one go
• Inner diameter 41.00 mm / outer diameter 45.00 mm / height 15.00 mm / wall thickness 2.00 mm — precision-machined to K-Tech tolerances

Performance on Track

The Ninja 400 has earned a strong reputation in junior and single-make racing classes, where suspension consistency separates podium finishers from mid-pack results. Worn or low-quality fork bushings introduce play into the slider-outer tube interface, generating a vague, deflective feel through fast chicanes and late braking zones. The GBS-007 kit closes that tolerance gap with its layered construction: a hardened steel core provides the structural rigidity to handle repeated heavy-braking loads, the copper interlayer distributes stress evenly, and the PTFE surface coating allows the fork legs to move with minimal breakaway friction. The result is a fork that responds immediately to input rather than lagging behind the rider's commands.

Build Quality & Longevity

K-Tech's fork bushings are manufactured to the same standard as the components found in the brand's competition suspension products. The tri-layer material stack — steel, copper, PTFE — is the industry-accepted approach for high-cycle fork bushings because each layer serves a distinct function. Steel carries the load, copper absorbs micro-vibrations and prevents fretting corrosion, while PTFE keeps the sliding surface dry and clean without relying on fork oil for lubrication. This translates to a longer service life compared to plain OEM-style bushings, particularly in the abrasive conditions of track days and racing circuits.

Fitment & Compatibility

The GBS-007 kit is designed exclusively for the Kawasaki Ninja 400 covering model years 2018 through 2023. It is not compatible with other Kawasaki models. Installation requires specialist fork tooling and a working knowledge of telescopic fork assembly; K-Tech recommends fitting by an authorised K-Tech Service Centre to ensure correct seating and safe operation.

Specifications

• Inner diameter: 41.00 mm
• Outer diameter: 45.00 mm
• Height: 15.00 mm
• Wall thickness: 2.00 mm
• Material: hardened steel with copper coating and PTFE-coated contact surfaces
• Part number: GBS-007
• Contents: 2 fork guide bushings