YJGZSVK Carburetor Rebuild Kit for Mikuni HSR 42/45/48mm Smoothbore – Float & Seal Replacement for Harley Twin Cam/EVO

YJGZSVK Carburetor Rebuild Kit Float restores smooth fuel delivery to Mikuni HSR 42/45/48 smoothbore carburetors used on Harley Twin Cam and EVO Big Twin engines.

If your Harley’s Mikuni HSR carburetor is leaking, running rich or inconsistent, a fresh rebuild kit with a new float and wear components is often the quickest way to bring reliable performance back without replacing the whole carburetor. This YJGZSVK KHS-016 kit is crafted to fit Mikuni HSR 42mm, 45mm and 48mm smoothbore units commonly installed on 1990–2006 Harley Big Twin and Twin Cam models.

How does this kit address common carburetor problems?

The rebuild kit provides replacement rubber, seals and a new float to stop fuel leaks, fix erratic idling, and reduce flooding that causes hard starting. Replacing aged internal parts restores proper float level and sealing surfaces so the carburetor meters fuel more consistently across throttle positions.

• Includes a precision float to correct fuel level and prevent overflow.
• Replacement O-rings and gaskets restore sealing at jets and passages.
• New needle/seat components ensure proper shutoff of fuel flow.

Which motorcycles and carburetor sizes is this kit compatible with?

This YJGZSVK kit is built specifically for Mikuni HSR smoothbore carburetors in 42mm, 45mm and 48mm sizes. It fits many Harley applications that use HSR 42/45/48 carbs, including EVO Big Twin and Twin Cam models from the listed years.

• Fits Mikuni HSR 42mm, HSR 45mm and HSR 48mm smoothbore carburetors.
• Compatible with Harley Twin Cam models from 1999–2006.
• Compatible with Harley EVO Big Twin models from 1990–1999.

What’s included and what should I check before buying?

The package ships with one complete carburetor rebuild kit as pictured, containing the float and necessary seals and small components. Before purchase, confirm your carburetor model and bore size match the HSR 42/45/48 specification to ensure correct fitment.

• One carburetor rebuild kit (KHS-016) with float and sealing parts included.
• Verify your carburetor is a Mikuni HSR smoothbore 42/45/48 model before ordering.
• Contact seller if uncertain; support responses are typically within 24 hours.

How difficult is installation and what tools are needed?

Installation is a moderate DIY task for someone comfortable with small engine work: disassemble the carburetor, replace old parts with the new kit components, and reassemble while restoring the correct float height. If you prefer, a qualified mechanic or motorcycle shop can perform the rebuild quickly.

• Basic hand tools: screwdrivers, small pliers, and a set of metric sockets/wrenches.
• Carburetor cleaner, lint-free rags, and a small parts tray to keep components organized.
• Calipers or a float-height gauge help verify proper float adjustment on reassembly.

Who is this for? The YJGZSVK Carburetor Rebuild Kit Float (KHS-016) is aimed at Harley owners, home mechanics and professional tuners working with Mikuni HSR 42/45/48 smoothbore carburetors. If you ride a 1990–1999 EVO Big Twin or a 1999–2006 Twin Cam with an HSR carb, and you’re experiencing fuel-level issues, flooding, or degraded throttle response, this kit supplies the core replacement parts to restore steady fuel metering and extend the life of your carburetor without the cost of a full replacement.