When it’s time to rebuild your two stroke top end, equipped with a TSP head or head insert, you are going to want to replace the o-ring (oring) that goes inside the TSP head insert and seals between the insert and the head cap. These o-rings are a critical component to properly sealing the TSP head insert. We do not recommend reusing them.
The kit includes one small o-ring that seals between the TSP insert and the head cap. These o-rings are made from the highest quality VITON material to withstand long term exposure to both chemicals and heat.