Chaps for Yamaha Roadliner / Stratoliner Engine Guard P/N STR-1D731-20-00 Fits: Yamaha Roadliner/Stratoliner models with OEM engine guard P/N STR-1D731-20-00. Protect your engine guard from rock chips and block the wind from your legs with these engine guard chaps. Weather resistant vinyl. Installs and removes easily.