Speedo Seats & Luggage- racks Frame Chassis Suspension Forktubes Wheels Brake Fenders Gastanks Motorparts Gaskets Intake Transmission & Driveline Exhaust Electrical & Lights Handlebars, Cables & Mirrors Oil tanks Oil & Chemicals Fasteners Windshields Forward controls, Footpegs Miscellaneous MOTOR PARTS - LOWER END 10 624 NEW PRODUCTS ADDED WEEKLY AT / MOTORCYCLESTOREHOUSE.COM How it works: Active crank vents On the down stroke of the pistons the air in the crankcase is compressed. H-D engines, either bottom or head vent models, are not able to vent the required volume. With large displacement engines this problem increases even more. All crank vents let the pressure escape, but also partially allow it to return when the pistons go up. In an active crank vent (crankcase breather) a valve closes, preventing gasses to re-enter the crankcase, creating a stronger partial vacuum inside the crankcase. This can increase horsepower, depending on the engine. Less problems will occur with blown or weeping gaskets and piston compression rings will seal better. tech-tip 57 PCV CRANKCASE BREATHER CANNISTER Positive Crankcase Ventilation, a universal chrome plated steel crankvent system for use on all H-D models. Fits regular 3/8" oil lines. The engine can breath out, but not breath in, thus maintaining vacuum in the crankcase at all RPM for improved performance. Note: Primarily designed for bottom vent and custom head vent applications. Can not be used in regular head vent applications due to space required. 510784 Crankcase breather 510784 509980 CRANKCASE OIL STRAINER Fits 52-76 K, XL models and 37-73 all 45", 74"/80" Flathead models. Repl. 24975-37. 509980 XL oil strainer BREATHER PIPE ASSEMBLY Fits 48-64 Panhead with 61" or 74" displacement, between crankcase and primary. 48-57 & 1964 61"/74" Panhead 915042 Breather pipe. Repl. 24912-48A 58-63 Panhead 915424 Breather pipe. Repl. 24913-58 915425 Breather nipple. Repl. 24918-58 915042 915424 915425 BALL & SPRING, OIL FILTER BREATHER XL Replacement check ball and spring. Check ball 950918 L87-21 XL; 08-12 XR1200. Repl. 26437-86B Spring 950919 L87-90 XL. Repl. 26436-86 950920 91-21 XL; 08-12 XR1200. Repl. 26436-90A K&N, CRANKCASE BREATHER FILTERS The filter with male connection can be installed in a regular oil hose. The filter with the female connection can be installed directly to, for instance, the crankcase ventilation system. Male connection 517260 3/8" (Std H-D oil line) 517272 1/2" 517273 5/8" Female connection 517263 3/8" 517260 517263 901710 CRANKCASE BREATHER FILTER Chrome plated with mounting bracket for ease of installation. For 3/8" ID hose. 901710 Open with cone-style top 901764 Open with tab 970565 Slotted design BREATHER SCREEN, CRANKCASE Fits 36-69 Knuckle, Pan and Early Shovel, below the breather valve. Repl. 25275-36. 909640 36-69 B.T. 909640 901764 970565 904075 CRANKCASE OIL SCREEN PARTS L52-62 Big Twin 555547 Tappet oil screen. Repl. 24975-52 555560 Check valve body, tappet oil screen. Repl. 24985-52 518311 Cork seal, check valve. Repl. 24990-52 L66-69 Big Twin 965431 Oil screen. Repl. 24981-66 924984 Spring. Repl. 24982-66 70-99 Big Twin models (excl. Twin Cam) 904075 Oil screen. Repl. 24981-70 924982 Spring, oil screen. Repl. 24982-70 507195 James o-ring, oil screen plug. Repl. 11105 979935 Athena. o-ring, oil screen plug. Repl. 11105 561477 James o-ring, oil screen plug. Repl. 11105 526224 James o-ring, oversized, oil screen plug 52-99 style oil screen plugs 927022 GW plug, allen style. 52-65 B.T. 927023 GW plug, allen style. 66-69 B.T. 513520 Colony plug, hex style. 70-80 B.T. Repl. 657 927024 GW plug, allen style. 81-99 B.T. (excl. Twin Cam) 501876 Colony plug, hex style. 81-99 B.T. (excl. Twin Cam) 989072 Colony OEM style, chrome. 81-99 B.T. 929681 Colony OEM style, zinc. 81-99 B.T. Repl. 26263-80 COLONY - OIL SCREEN KIT OEM reproduction oil screen kits. 989050 70-99 B.T. (excl. Twin Cam). Incl. spring 989049 00-17 Softail. Repl. 24983-00 screen and 11301 O-ring 989050 989049 OIL SCREEN KITS, CRANKCASE Kits come complete with tappet oil screen, spring and a crankcase plug. 904106 L66-69 B.T. 904107 70-80 B.T. 904108 81-99 B.T. (excl. Twin Cam) 904108 904106 904107 555560 950920
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