JSP Manufacturing Jet Ski Gas Cap & Filler Neck Kit, Black Cap — Translucent White Neck & Gasket

Replacement aftermarket jet ski gas cap, rubber gasket, and translucent white filler neck kit engineered to fit Kawasaki OEM numbers 59231-3734 and 51049-3714.

This JSP Manufacturing kit supplies a complete fuel inlet solution for many Kawasaki personal watercraft models, delivering an OEM-quality replacement that installs in minutes. The set includes a white (translucent) filler neck, a screw-mounted gas cap available in four colors, and a pre-installed rubber gasket. The filler neck in this kit does not include an overflow nipple; the cap comes with a top nipple and a bottom screw fitting for attaching a chain.

Will this kit fit my Kawasaki PWC?

The kit is designed to replace Kawasaki part numbers 59231-3734 (and superseded 59231-3716) for the filler neck and 51049-3714 for the gas cap. It has been reported to fit many Kawasaki models across multiple years, but you should verify against the part numbers on your machine.

• Covers a wide range of Kawasaki models including 800 SX-R, 900 STX/STS, 1100/1200 variants, STX-12F, STX-15F, STX 160 series and SX-R years listed.
• Confirm compatibility by matching your OEM part number to 59231-3734 or 51049-3714.
• May fit additional years or models not listed; cross-check before purchase.

What differences should I expect compared to the original part?

This is an aftermarket replacement built to OEM specifications, with a couple of notable differences: the filler neck is translucent white and it omits the overflow nipple. The gas cap uses a screw-on attachment for the chain rather than a clip-style retention.

• Filler neck: translucent white material, no overflow nipple included.
• Gas cap: available in black, blue, red, or green; comes with rubber gasket installed.
• Chain attachment: cap uses a bottom-mounted screw for chain anchoring instead of a clip.

How easy is installation and what tools will I need?

Installation is straightforward for anyone comfortable with basic PWC maintenance. The kit replaces the factory filler neck and cap assembly and fits into the original mounting location; typical removal of the old neck and securing the new one requires common hand tools.

• Tools: basic hand wrench or socket set, screwdriver for chain screw, and pliers if needed.
• Time: most installations take under 30 minutes when following OEM removal steps.
• Parts included: filler neck, gas cap (color of your choice), and installed rubber gasket—no extra seals required.

What are the kit dimensions and material notes?

The kit’s physical measurements are compact and match the original mounting envelope so it fits the existing fuel opening. The white filler neck is translucent to help visually confirm fuel movement, and the cap gasket arrives pre-installed for a quicker swap.

• Overall height approximately 3 inches; overall width about 3.20 inches (see photos for detailed measurements).
• Neck heights: top-to-ring ~7/8 inch, ring-to-base ~2 inches.
• Made in USA and supplied as a single complete kit (quantity = 1).

Who is this for: This JSP Manufacturing kit is aimed at Kawasaki PWC owners, repair shops, and marine technicians who need a dependable aftermarket replacement for a worn or damaged fuel filler assembly. Choose this kit if you want an OEM-quality, ready-to-install gas cap, gasket, and translucent filler neck in a color-matched cap option, and verify OEM part numbers before ordering for fitment assurance.