A ported breather passageway and a machined breather window allows the air/oil mist to flow from the flywheel cavity to the cam chest of the engine with the least possible restriction
Crankcase venting can be achieved via two crankcase breathers, the cylinder heads, or both! We recommend using both crankcase breathers in engines larger than 95"
Relocated cam chest oil pick-up increases gear case scavenging and virtually eliminates oil carry-over at sustained high speeds
S&S Cycle 92-99 BT w/ 4-1/8in Bore Small Diameter Flywheel Special Application Crankcase
Cam chest is moved outward .250" to allow crankcases to handle large cylinder bore sizes
Designed for high performance engines with cylinder bores between 4" and 4 3/8".
Machined to accept the stock oil filter assembly used on 1992-'99 big twins
Fits: 1984-'99 big twins with 4" bore and over
Fits: S&S 4" bore: V100, V107, V113, V107T
Fits: S&S 4 1/8" bore: V124, V111, V117
Clearanced for strokes as long as 5"
Fits: S&S 4 3/8" bore: V126
