JIMS Pinion Gear Red Size 1.4729–1.4737 for Harley Big Twin 1977–1989

This JIMS red pinion gear is designed for Harley-Davidson Big Twin engines requiring precise timing gear fitment.

The gear is manufactured to a controlled size range of 1.4729 to 1.4737 inches and is color-coded red for easy identification during engine assembly. Correct pinion gear sizing is critical for proper cam gear mesh, noise control, and long-term reliability in the timing gear train.

Designed for Harley-Davidson Big Twin models from 1977 through 1989, this pinion gear is intended for late Shovelhead and early Evolution engines using stock-style timing gear systems.

Manufactured in the United States by JIMS. At Boomers Bike Shop, we stock precision engine components that fit correctly and are trusted for real Harley-Davidson engine builds.

Fits Harley-Davidson Models:

Big Twin: 1977–1989

⚠️ Pinion gear sizing must be verified during engine assembly. Intended for professional engine measurement and setup.