Briggs Animal Valve Spring Tool Hub Shim Kit and is the single-waist model X30125815A and packaged with care Size:13 Wide otk brakes

and is the single-waist model shown in the second picture here

This part is one of the most essential spares every Rotax racer should have in their toolbox

integrated rubber grommets for easy mounting and adjustment

This component secures to the exhaust port of the engine with two M8 hex head screws and supports the flow of exhaust gases into the silencer

and fits most full-size kart chassis

Briggs Animal Valve Spring Tool Hub Shim Kit and is the single waist model X30125815A and packaged with care Size:13 Wide otk brakes and is the single waist model shown in the second picture here This part is one of the most essential spares every Rotax racer should have in their toolbox