Stark Varg Motor case breather pipe valve

The breather pipe valve fits on the vent line from the Stark Varg motor case, letting the case equalise pressure as it heats and cools without drawing water or dirt back in. If it clogs or sticks shut, the pressure has nowhere to go and works on the case seals instead, so it is worth checking whenever the countershaft seal is replaced. Part number STD-FI-0003.