YGQ Mikuni Carburetor Jet Kit 30-Piece for VM28/486 — Main & Pilot Jets for Precise Tuning

YGQ 30-piece carburetor jet kit bundles large round main jets and pilot slow jets for precise tuning of Mikuni VM, TM, HSR, RS and similar carburetors.

If your bike’s carburetor needs finer fuel metering — whether you’re correcting high-altitude lean conditions, compensating for an aftermarket exhaust, or dialing in throttle response — this YGQ kit supplies a broad range of main and pilot jets matched to popular Mikuni families. The set targets a wide variety of street and off-road motorcycles including many Suzuki, Kawasaki and Yamaha models, and covers common Mikuni types like VM16/29/33 smoothbore and TM pumper series.

What sizes and jet types are included in the set?

The kit contains 30 individual jets split between large round main jets and pilot (slow) jets so you can mix-and-match for optimal air-fuel ratios. Main jets cover a wide span of sizes while the pilot jets provide fine control at idle and low throttle openings.

• Main jet sizes: #120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 200, 210, 220, 230, 240.
• Pilot slow jet sizes: 17.5, 20, 22.5, 25, 27.5, 30, 32.5, 35, 37.5, 40.
• Total pieces: 30 jets, packaged for quick selection during tuning sessions.

Which motorcycles and Mikuni carburetor models will these jets work with?

This aftermarket kit is designed to fit many classic and modern motorcycles that use Mikuni carburetors by covering common jet and needle combinations. It lists compatibility with several Suzuki, Kawasaki and Yamaha models and aligns with multiple Mikuni model series used in both street and performance tuning.

• Compatible bikes include Suzuki DR-Z125, GS450/G500/650/750/850/1000/1100/1150 series, Kawasaki H1/H2, Z1-900, KZ900/1000/1100, and Yamaha TTR125, XS350/400/750/1100 among others.
• Carburetor fit: VM16, VM29, VM33, VM28/486, TM33-8012, TM36-68, TM40-6, RS34/36/38/40, HSR42/45/48 and HS40 variants.
• Compatible needle jet series: 171, 188, 196 (with large round), plus 568, 640, 723 references for cross-checking.

How will these jets affect engine performance at different throttle positions?

Swapping main jets changes fuel flow at mid-to-wide throttle, which impacts power and top-end response, while pilot jets tune idle, transition and low-throttle smoothness. Using the kit helps you identify the best combination for your altitude, fuel, and engine modifications without buying single jets separately.

• Smaller pilot jets lean the mixture at idle and improve throttle crispness; larger pilots richen idle for stability.
• Larger main jets increase fuel delivery under load, reducing lean surging; smaller mains lean the midrange for efficiency.
• Combine incremental main and pilot changes to isolate which jet alters a specific running issue.

What should I know before installing these aftermarket jets?

Basic carburetor understanding and standard tools are required: remove the float bowl, replace the jet, and confirm no debris or damage in the carb. Always make small incremental changes, record each swap, and test ride between adjustments to evaluate behavior across the rev range.

• Clean the carb thoroughly to avoid contamination before installing new jets.
• Keep a log of pilot and main jet sizes used for each test ride to reproduce results.
• Use appropriate torque and avoid overtightening brass jets to protect threads.

Who this is for: This YGQ jet kit suits motorcycle enthusiasts, home tuners, and professional mechanics who work with Mikuni-equipped bikes and need a wide selection of spare main and pilot jets for tuning, repair, or adaptation to aftermarket parts. It’s especially useful for riders changing altitude, exhaust, or intake systems who prefer hands-on carb tuning without ordering individual jets.