900939 Primary drive locking tool. White

Every Harley mechanic needs a reliable way to lock down the primary, and this MCS locking tool is a shop essential. It is made from white POM, a polyoxymethylene polymer known for being incredibly tough and resistant to impact. You simply wedge it between the primary chain and the front motor sprocket to keep everything stationary while you are loosening or torquing down sprocket and clutch nuts. It fits a wide range of bikes, including 1936 to 2006 4 and 5-speed Big Twins, 1957 to 2020 XL Sportsters, and 1987 to 2010 Buell models. This tool replaces OEM numbers 41214 and 900939, making primary service much safer and easier without risking damage to the teeth or chain.