Described as a belt roller timing tool by Ducati, the Laser 8649 timing tool is designed to hold the camshafts in their timed position while allowing the sprockets to move so ensuring the belt tension is equally set when replacing the cam belts on late model 821 to 1200cc v2 engines. Applications include: Ducati 821 to 1200cc engines from 2010 to 2021. Ducati models covered include: Diavel 1200, Hypermotard 939 & 950, Monster 821 & 1200, Multistrada 950 & 1200, Streetfighter 848 & 1098, Superbike 848 & 1198. Designed to fit in accordance with OEM instructions. Equivalent to OEM number 88765.1623. Designed to hold the camshafts in alignment while setting the belt timing.