Anti Blow Seal - for the 3rd Bearing 

Most 1/5 Gas engine comes with an oil seal to keep compression so your engine can start, but most of us will replace the oil seal due to drag with another Sealed Bearing. And during the course of Heat Racing or Competition this Seal Bearing Cover can be blow away due to high rpm and high compression. So this Anti Blow Out Seal comes into the picture. You just need a piece to place between the two bearings nearest the clutch or prop.

When you are using a 3rd Bearing and have problem starting your engine it can also be due to the Blown Seal Bearing Cover coming loose.

for Zenoah, CY, RCMK, TK -  Marine and Car Gas Engine