4004-1001-00 Carb Mounting Flange for Moto-Ski Sonic 250 1976

Carb Mounting Flange for Moto-Ski

This carb mounting flange is the intake manifold boot that seals the carburetor to the engine on Moto-Ski Sonic 250 snowmobiles, carrying OEM cross-reference 4004-1001-00.

Overview

This carb mounting flange provides a secure, sealed connection between the carburetor and the engine intake on your vintage sled. The flange keeps air from leaking past the carburetor mount, which helps the engine hold a steady idle and pull cleanly through the throttle range. It is built for riders maintaining and restoring a 1976 Moto-Ski Sonic 250.

Built For Performance

• Seals the carburetor to the intake to prevent air leaks that upset idle and mid-range fueling
• Direct cross-reference to OEM part number 4004-1001-00 for confident sourcing
• Rigid mounting surface that keeps the carburetor properly aligned on the engine
• Flexible construction that absorbs engine vibration at the carb mount
• Sold as a single replacement flange for one carburetor installation

Fits These Machines

• for Moto-Ski Sonic 250 (1976)

On-The-Job Use

• Replacing a cracked, hardened, or leaking carb flange during routine engine service
• Carburetor rebuilds where the old mounting boot no longer seals
• Vintage snowmobile restoration projects returning a Sonic 250 to running condition
• Diagnosing lean-run symptoms traced to an intake air leak

Specs At A Glance

Good To Know

Q: How do I know if my carb mounting flange needs replacing? A: Cracks, a hardened or brittle feel, or an erratic idle that changes when you spray carb cleaner near the flange are common signs. A failed flange lets unmetered air into the intake and throws off fueling.

Q: Does this flange match the original part on my Sonic 250? A: It is cross-referenced to OEM number 4004-1001-00, which is the flange number listed for the 1976 Sonic 250. Always compare it against the part on your machine before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.