Mikuni VM4413 Throttle Valve Spring for VM Series Round Slide Carburetors

The Mikuni VM4413 is a genuine OEM replacement throttle valve spring designed for Mikuni VM Series round slide carburetors. This spring seats in the mixing chamber top and applies consistent return tension to the throttle slide (valve), ensuring the slide returns smoothly and completely to the closed position when the throttle is released.

Using a genuine Mikuni replacement spring during a carburetor rebuild helps maintain the precise throttle response and reliable idle characteristics the VM Series is known for. A worn or fatigued spring can cause erratic throttle return, hanging idle, or inconsistent slide movement — making this a critical component to inspect and replace during routine maintenance.

Key Features:

• Genuine Mikuni OEM replacement part
• Designed specifically for Mikuni VM Series round slide carburetors
• Provides correct return tension on the throttle valve (slide)
• Essential component for carburetor rebuilds and maintenance
• Direct fit — no modification required

The Mikuni VM Series round slide carburetor is a performance benchmark for motorcycles and ATVs, used in motocross, enduro, trail riding, flat track, and road racing on both 2-stroke and 4-stroke engines. Keeping internal components like the throttle valve spring in top condition ensures consistent, reliable throttle response across all operating conditions.