S&S Cycle

1984–'99 big twins

1984–1999 Evolution ® 1926–1984 Vintage Engines Tools & Shop Supplies Warranty & Company Policy Appendix & Index

HIGH VOLUME HIGH PRESSURE (HVHP) BILLET OIL PUMPS FITMENT

OPTIONS Pump Only Kits: • Complete oil pump assembly • Oil pump driveshaft • Miscellaneous hose fittings and plugs • Paper gaskets

• 1984–’99 big twins • S&S V-Series engines

FEATURES AND BENEFITS • No thicker than a stock pump • Gears with fewer, but larger teeth provide increased oil volume for both supply and return sides of the pump • Supply gears are 9% wider than stock and standard S&S oil pumps • 28% wider than stock return gears ensure proper crankcase scavenging, reduce drag on the flywheels, and eliminate oil carryover • Increased scavenging capacity results in: • Less oil in the crankcase • Less oil carryover • Equipped with a stock length oil pump drive shaft USPATENTRE42,408 HVHP OIL PUMP exclusive

• Mounting hardware Pump And Gear Kits: • For stock 1984–'89 engines or engines with S&S flywheel assemblies • Everything in the "pump only" kits

• Oil pump drive shaft gear • Oil pump pinion shaft gear • Steel breather gear and shim kit

HIGH VOLUME HIGH PRESSURE OIL PUMP KITS FOR 1984–'99 BIG TWINS Year Group Cover Type Pump Only Kit

Pump w/Gear Kit*

31-6214

31-6307 31-6302

1984–'91

Universal

Universal

31-6208 USA 2,3

1992–'99

Standard 31-6298 *Pinion shaft gears included in these kits fit stock 1984-’89 pinion shafts and S&S pinion shafts for 1984-’99. Will not fit stock 1990-’99 straight pinion shafts. Standardstylecovershave feedandreturnholes inthestock locations.Theuniversalcoverhasanumberofoil feedandreturnoptions,allowingmaximumflexibility forcustomized applications. 31-6209

The gear tooth profile and the extra gear width of the HVHP oil pump work together to maintain higher oil pressure and to scavenge additional oil from the crankcase.

REPLACEMENT PARTS: SEE PAGE 81

31-6208

STANDARD BILLET OIL PUMPS  GLOSS BLACK NOW AVAILABLE! FITMENT • 1984–’99 big twins FEATURES AND BENEFITS • Machined with an oil pressure relief bleed off valve to maintain consistent oil pressure from the time the engine is started to the time it’s shut off

OPTIONS Pump Only Kits • Complete oil pump assembly • Oil pump driveshaft • Miscellaneous hose fittings and plugs • Paper gaskets

• Oil pressure regulation bypass route allows excess oil not used by the engine to return directly to the supply side of the pump, reducing foaming and cavitation • No thicker than a stock pump • Increased scavenging capacity results in: - Less oil in the crankcase - Less oil carryover • Equipped with a stock length oil pump drive shaft

• Mounting hardware Pump And Gear Kits • For stock 1984–'89 engines or engines with S&S flywheel assemblies. • Everything in the "pump only" kits

• Oil pump drive shaft gear • Oil pump pinion shaft gear • Steel breather gear and shim kit

OIL PUMP KITS FOR 1984–'99 BIG TWINS Year Cover Type Pump Only Kit

Pump & Gear Kits

1984–'91 Universal

31-6203 USA

*31-6295 USA

Gloss Black Universal

310-0899

–

1992–'99

Standard

31-6206 USA

*31-6296 USA

Universal – *Pinion shaft gears included in these kits fit stock 1984–’89 pinion shafts and S&S pinion shafts for 1984-’99. Will not fit stock 1990–’99 straight pinion shafts. Standardstylecovershave feedandreturnholes inthestock locations.Theuniversalcoverhasanumberofoil feedandreturnoptions,allowingmaximumflexibility for customizedapplications. REPLACEMENT PARTS: SEE PAGE 80 31-6205 USA 1

31-6203

NOTE: Chrome Plating the Pump— It is extremely difficult to chrome plate an oil pump without getting chrome in the passageways, cavities or on the machined surfaces where the gears, check ball, and pressure valve operates. Chrome in these areas as well as on the gasket surfaces impairs the pumps performance by altering the operating tolerances machined into the parts. In addition, abrasive particles of chrome may break loose causing damage to the pump and the engine. Because of this, S&S does not recommend chrome plating the pump body or cover. S&S voids its warranty if these parts are chrome plated.

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