BH-Motor Mikuni Twin Carb Rebuild Kits — 2 Sets for Sea-Doo/Yamaha/Polaris, gaskets & diaphragms

Two complete Mikuni twin-carburetor rebuild kits from BH-Motor refresh both carbs for reliable throttle response and leak-free performance.

If your Sea-Doo, Yamaha, or Polaris watercraft exhibits rough idling, fuel seepage, or sluggish throttle changes, renewing worn carburetor parts is a cost-effective repair. This BH-Motor set includes two full rebuild kits tailored to Mikuni-style carburetors used across many Sea-Doo SP/GTX/GTS models, numerous Yamaha WaveRunner and Wave Blaster variants, and select Polaris SL and TS series. Each kit replaces the small components that fail first: gaskets, O-rings, needles, and diaphragms, restoring proper fuel metering and sealing.

What parts are included and why do they matter?

Each kit supplies the service items technicians typically replace during a carb overhaul so your jets, bowls, and floats can work as intended. Replacing degraded rubber and tiny metering parts prevents vacuum leaks and erratic fuel flow that cause stalling or poor acceleration.

• Diaphragms and gaskets — restore airtight seals and correct vacuum operation.
• Needles and seats — ensure accurate fuel metering at varying throttle positions.
• O-rings and small seals — stop seepage around screws, bowl fittings, and vacuum ports.
• Springs and jets (where included) — reestablish correct spring tension and flow rates.

Which models and years will these kits fit?

BH-Motor designed these rebuild sets for Mikuni-style twin carbs found on many late-20th and early-2000s PWC models. Compatibility covers a broad range of Sea-Doo, Yamaha, and Polaris watercraft but always confirm visually against your carburetor before ordering.

• Sea-Doo: SP, SPX, GTX, GTS, GSI, GSX, GTI, CHALLENGER and related years from the 1990s to early 2000s.
• Yamaha: SuperJet, WaveRunner, Wave Blaster, Wave Raider, Wave Venture, VXR, XL and GP series across 1990s–2005 ranges.
• Polaris and others: SL and SLT series, plus select TS models for late 1990s models.

How difficult is installation and what tools will I need?

Replacing carburetor rebuild kit components is a moderate DIY task for someone comfortable with small-engine maintenance; it requires patience and basic tools. If you can remove carburetors and follow a step-by-step service manual, you can complete the job; otherwise a small-engine mechanic can install the kits quickly.

• Basic hand tools — screwdrivers, sockets, and pliers for removal and reassembly.
• Carb cleaner and a soft brush — clean passages before fitting new parts.
• Clean work surface and small containers — organize tiny springs, jets, and screws.
• Service manual or exploded diagram — confirm part orientation and torque specs.

Will this kit solve every carb problem or do I need extra parts?

These kits address the common wear items that cause most carburetor issues, but they don’t replace damaged bodies, warped floats, or corroded fuel bowls. Inspect metal components and jets for wear or corrosion; replace or repair any damaged items that are outside tolerances.

• Ideal for aging rubber parts, leaky bowls, and weak diaphragms causing performance issues.
• Not a substitute for replacement carburetor bodies or jets that are stripped or corroded.
• Combine with a thorough cleaning and inspection for best results.

Who is this for? These BH-Motor twin carburetor rebuild kits are aimed at PWC owners, boat builders, small-engine mechanics, and DIYers who want a cost-effective way to restore fuel delivery on Mikuni-equipped watercraft. If you maintain Sea-Doo, Yamaha, or Polaris models from the 1990s through the early 2000s and need to stop leaks, cure poor idling, or regain crisp throttle response, these kits provide the common replacement components technicians expect for a reliable rebuild.