taco eater :
josh besecker from Camano Island, WA United States
OD is 56mm. Thats only gonna work for you big boy 86cc brn and mera kits. DOES NOT WORK FOR POLINI. Polini requires 54mm OD
treats edit: this will work perfecto with polini....just not with the STOCK head. you have to have a garellli head with a 56mm lip ID for the gasket to sit into. or one of the older minarelli BRN heads that had the larger 56mm ID.