Motorcycle treatment 4-cycle gas engine 1-1/4 oz Cerma treatment is the only product of it's kind! Cerma motorcycle treatment is highly recommended for Big Block Harley Davidson Motor bikes Harley Davidson fans this is the ticket to stop the common shifting CLUNK inherent in some Harley mc's Cerma treatment will create a diamond hard surface on all metal parts and will restore tolerances to factory specs, reduce or eliminate blowby, improve engine harmonics, Cerma restores life to your old motor and Extends life to your new motor!