Page 279 of High Performance Parts for American V-Twins 2008 by S&S Cycle

1958-2008 50th ann iversary s&s® crankcase breather reed valves for 1993-up big twin engines for many years v-twin engines have had problems with oil carry-over more commonly known as oil out the breather oil carry-over usually happens at sustained high speeds and although it is more frequently encountered in big inch high performance engines a large number of stock engines also display this undesirable behavior for years it was just something you sometimes just had to live with but now riders have a way to eliminate this long standing inconvenience a couple of years ago s&s introduced an inexpensive and highly effective crankcase breather reed valve for harley-davidson® twin cam 88® engines it was so successful in reducing oil carryover in twin cam 88 engines that we are now offering a crankcase breather reed valve for 1993 99 evolution® big twin engines with crankcase vent routed through the cylinder heads tests have shown it to be just as effective in reducing oil carryover as its counterpart for twin cam 88 engines pictured s&s breather reed valve kits are available in standard diameter and also in 030 diameter for use in engines with damaged breather bores s&s crankcase breather reed valves for 1993 99 big twin engines standard diameter msrp $89.95 31-2096 030 oversize for damaged engines msrp $99.95 31-2100 how do they work the functional part of s&s crankcase breather reed valves consists of steel reeds that are normally in the closed position when the pistons travel downward in the cylinders pressure in the crankcase below the pistons increases this pressure causes the reeds to open allowing the air and oil mist in the crankcase to escape into the cam chest when the pistons change direction and begin traveling back upward in the cylinders a vacuum is created in the crankcase the vacuum causes the reeds to close preventing air from entering the crankcase the effect is that a slight vacuum is maintained in the crankcase and oil scavenging is greatly improved note s&s crankcase breather reed valve is recommended for engines that vent the crankcase to the air cleaner through the cylinder heads for 1999-up big twin engines end that oil carry-over problem a few years ago s&s introduced a little gizmo called the crankcase breather valve for harley-davidson® twin cam 88® engines and over the last couple of seasons it has helped thousands of motorcycle owners to solve their oil carry-over problems now that the word has gotten out we expect to help thousands more riders enjoy their motorcycles without oil carry-over s&s crankcase breather valve for 1999-up big twin engines for engines with stock oil pump 1999 02 msrp $99.95 31-2070 2003-up msrp $99.95 31-2071 s&s special application crankcases .msrp $109.95 31-2086 engines with s&s oil pump 1999 02 stock crankcases msrp $99.95 31-2093 2003-up stock crankcases all s&s crankcases msrp $99.95 31-2094 spring adapter for s&s sa crankcases msrp $17.45 31-2103 required to accomodate the extra .375 case width of s&s special application big bore crankcases order toll free 866-244-2673 7-70

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