Search tools & parts — exact eBay / site search (no Lambretta prefix). Handy for non-Lambretta tuners.
Two calculators here for those that use percent and those that use ratio.
Enter the percent you mix your two stroke oil at and how many liters of fuel to find out how many ml of two stroke to add to your fuel tank.
Enter the ratio you mix your two stroke oil at and how many liters of fuel to find out how many ml of two stroke to add to your fuel tank.