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718 Jims® Breather valve gear (standard size) JIMS now offers a steel replacement breather valve gear for Big Twin®. Also available in +.030” oversize to correct a damaged breather valve hole. 53-0164 Use on Big Twin® 48-early 77 Breather valve gear (+.030” oversize) Oversize by .030”, this breather is used to repair a damaged breather hole. 53-0163 Use on Big Twin® 48-early 77 Backside of Jims cam cover 53-2371 53-2372 Cam Cover heat sink Not all engines maintain the same operating temperature. Big displacement, combustion chambers, cams, exhaust, spark, fuel, etc ... can all either increase or help reduce operating temperatures. Introducing the patent pending Jims Cam Cover Heat Sink. One of our calibration associates, Cornerstone Metrology set out to proove that a fin pack design integrated into a stock cam cover could help reduce cam cover heat. When riding, this design uses outside air to help reduce cam cover temperatures up to 10 degrees. After adding a little Jims DNA, you have a patent pending, American made cam cover insert that not only looks cool, but helps reduce cam chest temperatures. These Heat Sink inserts are completely machined out of solid 6061 aluminum and are offered either Chrome Plated, or RawCut Black. Installation uses existing timing cover hardware and only takes minutes. Use on 2001 to present Twin Cam models 53-2371 Black 53-2372 Chrome S&S Steel rotary breather gear kits For 48-99 Big Twin Fitment • 48-99 OHV big twins Features • All steel construction-superior dimensional stability, abrasion • Welded-in screen • Higher flow than stock • Elongated breather pocket scavenge hole for increased suction • Standard diameter for replacement or new builds • +.030" diameter for damaged engines • Breather gear and shim kits Standard Size 48-early 77 349-9624 S&S® Crankcase breather reed valve for Evolution® Big Twin style engines 93-99 • A couple of years ago S&S® introduced an inexpensive and highly effective crankcase breather reed valve for 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 Evolution big twin* style engines. Tests have shown it to be just as effective in reducing oil carryover as its twin cam style counterpart. • The Evolution style S&S® breather reed valve replaces the standard rotary breather valve in Evolution big twin style engines. Installation is fast and simple. Remove the original breather gear and insert the S&S® reed valve assembly into the breather valve cavity. No aligning timing marks, and no rotating parts. The S&S® crankcase breather reed valve can be used to replace the stock style rotary breather valve in engines with minor breather cavity damage, and there is a +.030” oversized reed valve for engines with heavily damaged breather bores. • Unlike the rotary breather valve that has been used in Harley-Davidson® big twin engines since the 1930’s, the S&S® crankcase breather reed valve is not dependent on the rotation of crankshaft to make it open and close. Therefore the opening and closing times are not determined by crankshaft position. Instead, the reeds open when the pressure in the crankcase becomes greater than pressure in the cam chest. The reeds then close when the pressure in the cam chest is equal to or greater than the pressure in the crankcase. The difference in the way these beather valves function is important because the ideal breather timing actually changes with rpm and the condition of the engine. By opening and closing “on demand” the reed valves automatically compensate for the lag time associated with accelerating the mass of air as it is forced out of the crankcase. This is most significant at high rpm when the time available to get the air out is the shortest. In addition, “on demand” operation allows reed valves to accommodate greater amounts of compression blow-by. Installation of the S&S® crankcase breather reed valve has actually stopped high rpm oil carryover in test engines with marginal piston ring seal. S&S® Evolution Style Crankcase Breather Reed Valves 50-4253 +.030” Oversize (for damaged engines) *NOTE: The Evolution style S&S® crankcase breather reed valve can be used in shovelhead style engines with open primary drives or sealed primary chain cases that do not require external lubrication or oil scavening. Cam covers Complete with points cover and cam cover base gasket at no extra cost! • Longer Engine Life • Rigid Bushing Mounts • True Centerline • Better Crankcase Breathing • Two Piece Construction • Two Screws are all that show • State of the Art O-Ring Sealing • Fit to factory specifications • Made in U.S.A. • Complete Instructions Included • Can be modified for 70-72, by engine builder. Kit includes: JAMES® Base Gasket • 2, O-rings • Cam Seal C/R • Points Cover with Gasket & Chrome Screws • Mounting Allen Bolts. • Improved crankcase breathing capability built in for increased power. 53-0312 Use on Big Twin® 73-92 (OEM# 25258-80A) Polished 53-0311 Use on Big Twin® 93-99 (OEM# 25254-93A) Polished (OEM# 25313-73) 53-0822 Same as above but with elongated oil hole


2017roadiron-cruiser_en
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