YUKIIATIF Carburetor Jet Kit for Mikuni VM/TM/HSR/HS - 42-Piece Tuning Set, Main & Pilot Jets

YUKIIATIF 42 Pcs Carburetor Jet Kit is a comprehensive selection of main and pilot jets designed to let you precisely tune Mikuni-style carburetors across VM, TM, HSR, HS and many other models.

This kit gathers 42 jets—large round and hex main jets plus pilot and VM-specific pilot jets—so you can adapt fueling to different altitudes, fuels, or engine mods without waiting for special-order parts. The assortment maps to common Mikuni sizes and compatible needle jet series, making it a go-to service kit for workshop tweaks, track-day tuning, and restoring performance on street bikes, ATVs, and offroad machines.

Which carburetors and motorcycles will these jets fit?

The set covers a wide range of Mikuni-style carburetors including VM18–VM44 families, TM24–TMX series, HS40 flat slide, HSR42/45/48, RS34–RS40 rack slides and VM round-slide variants. It also lists needle jet compatibility so you can match jets to your existing needle and slide configuration.

• Direct compatibility: VM, TM, HSR, HS, RS series listed in product details.
• Works for many 2-stroke and 4-stroke street bikes, ATVs, and offroad machines.
• Compatible needle jet series: 171, 188, 196 (with large round), 568, 640, 723.
• Fits popular brands like Suzuki, Kawasaki, Yamaha, Honda and Polaris when using compatible carb models.

How do I use this jet kit to tune my carburetor?

Start by identifying your current main and pilot jet sizes, then run a baseline with the existing configuration. Swap jets incrementally—one or two sizes at a time—and test under the same riding conditions to evaluate throttle response, midrange, and top-end behavior.

• Change pilot jets to correct idle and low-throttle response.
• Adjust main jets to refine midrange and full-throttle mixture.
• Use VM-specific pilot sizes for VM-series carburetors to match air/fuel curves.
• Keep a record of each change so you can revert if needed.

What sizes are included and why that range matters?

The kit contains both round and hex main jets in a broad span of diameters plus pilot jets tailored for general and VM-specific needs. This wide selection lets you compensate for variations in altitude, aftermarket exhausts, air filters, fuel blends, and engine wear—factors that all alter the ideal jetting.

• Large round main jets: sizes from 90 up to 190 covering fine to rich tuning needs.
• Large hex main jets: sizes from 130 to 280 for high-flow or heavily modified engines.
• Pilot jets: small sizes (17.5–40) for precise idle and low-throttle tuning.
• VM pilot jets: 25–60 range to suit VM-series carburetor idling characteristics.

Can this kit replace OEM part numbers and what about installation?

The jet sizes correspond to many OEM references and replace commonly used part numbers like TM33-8012, TM36-68, TM40-6 and others when matched correctly. Installation is straightforward for anyone with basic mechanical skills: remove the float bowl, swap the jet, and reassemble while following torque recommendations and safety precautions.

• Cross-references: works as replacements for several TM-series OEM numbers.
• Installation: basic hand tools and clean workspace required.
• Tip: inspect and clean the carburetor and needle seat before installing new jets.
• Keep original jets labeled when experimenting for easy restoration.

Who is this for: This YUKIIATIF 42-piece jet kit is aimed at DIY mechanics, track tuners, restoration shops, and riders who regularly modify or maintain carbureted engines. If you service multiple bikes or frequently adjust jetting for altitude, fuel type, or aftermarket parts, this kit provides a practical, cost-effective inventory of sizes so you can fine-tune performance without delays.