Aftermarket Mikuni VM40/44 Carb Intake Boot Flange – Replaces VM40‑200, Arctic Cat 0670‑198, Yamaha 8H8‑13555‑01‑00

OVERVIEW

This aftermarket Mikuni intake boot flange seals the connection between VM40 and VM44 carburetors and the intake tract, eliminating vacuum leaks that cause lean running and sluggish throttle response. Crafted from reinforced, cold-resistant rubber, this precision-machined component ensures enduring mechanical integrity in harsh winter conditions. Designed specifically for legacy Arctic Cat and Yamaha snowmobile platforms, it restores proper fuel metering and consistent engine operation.

ENGINEERING & PERFORMANCE

The direct-replacement geometry matches OEM-style tolerances to maintain a stable air/fuel mixture while preventing the vacuum leaks responsible for bogging and hard starting. Constructed from heat-stabilized rubber, the flange actively resists cracking and hardening when exposed to subzero temperatures and continuous drivetrain vibration. This design guarantees a leak-free interface between the carburetor spigot and intake manifold without requiring fabrication or aftermarket adapters.

KEY FEATURES

• Direct replacement for worn, cracked, or hardened intake flanges
• Maintains precise air/fuel delivery and eliminates vacuum leaks
• Reinforced rubber construction engineered for extended service life
• Manufactured in Taiwan to meet or exceed OEM specifications
• Compatible with Mikuni VM40 through VM44 carburetor assemblies
• Sold individually for straightforward parts ordering
• Restores consistent throttle response and stable cold-weather idling
• Eliminates need for RTV sealant or custom gasket modification

TECHNICAL SPECIFICATIONS

• Brand: SPI
• Part Name: Mikuni VM40/44 Carburetor Intake Boot Flange
• Component Type: Carburetor Part
• Material: Reinforced Cold-Resistant Rubber
• Supported Years: 1980–1994
• Compatible Trims: Arctic Cat Wildcat, EXT, Pantera, Prowler, ZR; Yamaha EX, SS, SR series

FITMENT

• Arctic Cat Wildcat 650 L/C (1989–1990)
• Arctic Cat Wildcat 650 L/C Mountain Cat (1989–1990)
• Arctic Cat Wildcat 700 L/C (1991–1994)
• Arctic Cat EXT 580 L/C (1993–1994)
• Arctic Cat Pantera 550 L/C (1993–1994)
• Arctic Cat Prowler 440 L/C (1994)
• Arctic Cat ZR 580 L/C (1994–1996)
• Arctic Cat ZR 700 L/C (1994–1995)
• Yamaha EX440 (1980–1981)
• Yamaha SS440 (1981–1983)
• Yamaha SR540 / SRV (1984–1988)

WHY RIDERS CHOOSE THIS

Riders install this SPI intake boot flange to permanently resolve the vacuum leaks that plague aging Mikuni carburetor systems and kill cold morning starts. The reinforced rubber compound actively flexes without deteriorating when subjected to freezing temperatures and engine vibration, keeping the critical air seal intact season after season. By restoring factory airtight conditions between the carburetor throat and intake manifold, it returns crisp throttle control, stable idle, and predictable acceleration on older sleds. It functions as a durable, drop-in solution that extends the viability of vintage carburetion setups without complex machining or costly complete rebuilds.