One of the most critical things you can do on a Briggs LO 206 engine with a long slide is make sure the slide opens to the maximum allowed. Using this gauge will help the racer to maximaize slide opening on the various Junior LO 206 engines. Since the gauge is the maximum size allowed on one end and .005" smaller on the other end it helps you get the slide opening at the maximum without going over the legal limit. There are several different colored slides of different lengths that Briggs makes. There is a gauge for every color and length slide.
Select the correct gauges for your color slide under options.