SPI 09-817837 Exhaust Power Valve Bellows for Polaris Snowmobiles

The SPI 09-817837 Exhaust Valve Bellows is an aftermarket replacement power valve bellows designed for Polaris snowmobiles equipped with a pneumatically actuated exhaust valve (power valve) system. This bellows is a critical component in the exhaust power valve assembly, responsible for opening and closing the power valves in response to cylinder pressure and ECU-controlled solenoid commands to optimize engine performance across the RPM range.

The bellows works by inflating with cylinder pressure when the ECU-controlled solenoid closes at higher RPMs, physically actuating the power valves to open. When RPMs drop, the solenoid vents and the bellows deflates, allowing the valves to close. A cracked, torn, or hardened bellows will result in sluggish power valve response, mid-range stumble, or complete power valve failure — making timely replacement essential.

Key Features:

• Aftermarket replacement for OEM Polaris exhaust valve bellows
• Manufactured to OEM specifications for proper fit and function
• Restores proper power valve actuation and throttle response
• Compatible with Polaris 440, 500, and 600 engine platforms
• Sold individually

Cross-Reference Part Numbers: 817837, 0926-0302, 12-5571, CG7837, VEP817837, 987000, 5410000, 5414495, 5412733, 5412399, 5412379, 5412147, 5412056, 009-817837

This SPI exhaust valve bellows is a cost-effective alternative to OEM Polaris parts and is an essential component to inspect and replace during any power valve service or rebuild.