| | oil pump parts new jims breather valve with elongated oil hole 741898 jims now ... gear in all 1977 thru 1999 big-twin engines except twin-cam models s&s reed valve ... over problems in evolution big-twin engines unlike the rotary breather valve that ... has been used in big-twin engines since the 1930 s the s&s crankcase ... ideal breather timing actually changes with rpm and the condition of the engine by ... compensate for the lag time associated with accelerating the mass of air as it is ... stopped high rpm oil carryover in test engines with marginal piston ring seal the ... reed valve replaces the standard rotary breather valve in evolution big-twin ... style engines installation is fast and simple remove ... can be used to replace the stock style rotary breather valve in engines with minor ...
|