Jims Tools 5835 On-Bike Valve Spring Compressor Tool for Milwaukee-Eight M8 Engines

The Jims Tools 5835 is a purpose-built, on-bike valve spring compressor designed specifically for Harley-Davidson Milwaukee-Eight (M8) engines. This innovative tool eliminates the need to remove the cylinder head from the motor when changing valve springs or replacing leaking valve seals — saving significant time and labor on every job.

Traditional valve spring service on M8 engines required full cylinder head removal, adding unnecessary time and expense to what can otherwise be a straightforward task. The Jims 5835 mounts directly to the rocker arm shaft with the cylinder head still installed, giving technicians full access to the valve springs without a teardown.

How It Works:

• Remove the rocker box covers and rocker arms to access the valve train
• Install the compressor tool onto the rocker arm shaft
• Fill the cylinder with compressed air to hold the valves in place
• Rotate the tool to compress the top collar of the valve spring, exposing the keepers
• Remove the top collar, valve spring, and valve seal with ease

Key Features:

• On-bike design — works with cylinder head installed on the motor
• Engineered specifically for Milwaukee-Eight (M8) engines
• Ideal for performance valve spring upgrades and valve seal replacements
• Dramatically reduces service time compared to traditional methods
• Black finish, sold as a kit (each)
• Manufacturer Part Number: 5835 | Drag Specialties Cross Reference: 3801-0366 (38010366)

The Jims 5835 valve spring compressor is an essential specialty tool for any shop or serious enthusiast performing engine service or performance upgrades on M8-powered motorcycles.