first...forgive my lack of knowledge!...does a briggs 18 hp twin have a compression release??...I have read that some engines have some sort of small valve compression release...and that some others have a lobe on the camshaft...do they fail??...the valve kind seems like it could fail..but can the lobe kind fail?....how would I know if my engine has a compression release without taking apart? Your knowledge would be appreciated..thanks..