Autoparts Carburetor for Yamaha Big Bear 350, Moto-4 350 & Kodiak 400 — Direct-Fit with Intake Boot

Autoparts replacement carburetor: a direct-fit, ready-to-install carb designed to restore reliable fueling for Yamaha Big Bear 350, Moto-4 350 and Kodiak 400 models within the listed years.

If your ATV is running rough, idling poorly, or stalling, a worn or damaged carburetor is a common cause. This Autoparts replacement unit is engineered as a like-for-like substitute for specified Yamaha part numbers, supplied with the intake boot and small parts shown so you can replace the old carb without hunting down additional components. It aims to bring back consistent throttle response and smoother running with minimal modification.

Which Yamaha models and years will this carburetor fit?

This replacement is built to fit specific Yamaha Big Bear, Moto-4 and Kodiak model ranges. Check the years and model designations carefully before purchasing to ensure compatibility with your ATV.

• Big Bear 350 — YFM350, model years 1987–1998
• Moto-4 350 — YFM350, model years 1987–1995
• Kodiak 400 — YFM400, model years 1996–1998
• Replaces Yamaha part numbers 3HN-13586-02 and 3HN-13586-01

How simple is installation and what comes in the package?

The carb is shipped with the intake boot and all small parts pictured so you can swap it into the intake tract without sourcing extra pieces. Basic mechanical skill and common hand tools are enough for most owners; a service manual helps for correct jetting and idle adjustments.

• Package includes: 1x carburetor, 1x intake boot, and pictured small parts
• Direct-fit design reduces modification or fabrication
• Recommended: fresh gasket sealant and new intake clamps during install

What performance or reliability improvements should I expect?

Replacing a tired carb with this Autoparts unit should return predictable throttle response and steadier idle characteristics, especially if the original suffered corrosion, clogged jets, or warped passages. It won’t change engine power beyond restoring factory fueling, but it can eliminate hesitation and hard-start symptoms tied to carb malfunctions.

• Cleaner, more consistent idling after correct adjustment
• Reduced stalling and hesitation under load
• OEM-compatible jetting range for stock engines (adjustable as needed)

Will I need tuning or extra parts after installation?

Minor adjustment is common after any carb swap—idle speed, air/fuel mixture, and choke calibration may require fine-tuning to match altitude, fuel type, or aftermarket exhaust. Most installs use the supplied parts without further purchases, but keep spare clamps and gaskets on hand.

• Expect to set idle speed and air mixture per service manual
• Consider fresh fuel lines and clamps if originals are aged
• Jetting changes only if engine has non-stock intake or exhaust components

Who is this for: This Autoparts carburetor is intended for DIY mechanics, ATV owners, and repair shops restoring Yamaha Big Bear 350 (YFM350 1987–1998), Moto-4 350 (YFM350 1987–1995), or Kodiak 400 (YFM400 1996–1998) machines to reliable running condition. Choose this part if you need a cost-effective, direct-replacement carburetor that arrives with the intake boot and the small components required to complete a standard swap—ideal for routine overhaul or when the original carburetor shows wear, corrosion, or clogging.