S&S Cycle

KN-SERIES ENGINES FOR 1936–’99 CHASSIS

FITMENT • KN74 • 1936–‘99 chassis • KN93 • 1936–’47 stock chassis—will fit in 1948–'65 chassis with front motor mount spacer (included) • 1970–’99 Alternator/generator and alternator custom versions, custom bikes with 1970–’99 alternator style primary

FEATURES AND BENEFITS • Natural crankcases and black powder coated cylinders and heads • S&S Super E • S&S valve train—solid lifters • S&S Super Stock™ single fire ignition system and polished billet timer • 1936–‘47 models have correct length sprocket shaft for stock primary and transmission • Alternator and alternator/generator models have correct sprocket length sprocket shaft for 1970–up primary and transmission • Alternator/generator engines include oil filter mount for generator location • Alternator style crankcase—allows the use of modern primary, transmission, clutch components and electrical system • One-year warranty

KN-SERIES ENGINE SPECIFICATIONS Engine Displacement Bore Stroke Carb

Camshaft

Piston Type Compression Ratio

KN74 KN93

74" 93" 93"

37/16" 331/32"

Super E S&S® 346 S&S Forged Super E S&S® 420 S&S Forged Super E S&S® 420 S&S Forged

7.5:1 8.2:1 8.2:1

35⁄8"

41⁄2" 41⁄2"

KN-Kone

35⁄8"

KN-SERIES ENGINES ± Description Application

Style

Warranty Part #

310-0025 106-2161

KN74 KN93 KN93

1936–‘99 chassis

Generator Generator

1936–’47 stock chassis

1 year

1970–’99 customs 106-2560 DISCLAIMER:NOTLEGALFORSALEORUSE INCALIFORNIAONANYPOLLUTIONCONTROLLEDMOTORVEHICLE.NOTLEGALFORSALEORUSE NATIONWIDEONANYFEDERALPOLLUTIONCONTROLLEDMOTORVEHICLEUNDERTHECLEANAIRACT ± WARNING:CancerandReproductiveHarm–www.P65Warnings.ca.gov Alternator/Generator

106-2560 ±

NOTES: Alternator/generator cases have 1948–’99 style front motor mount. Will not fit stock knuckle frames. Generator style engines have stock motor mounts for 1936–’47 style frames, but can be used in 1948–’99 style frames with front motor mount spacer, part #31-2017 (included). Alternator/generator cases require a transmission with 1970–up length mainshaft, and custom exhaust pipes must be fabricated. Engines for 1936–’64 chassis with tin primary must use a 1954–’64 style inner primary cover. S&S Super Stock generator style crankcases are available for stock 37/16" or 35/8" bore, but can be special ordered for bore sizes up to 313/16" and deck heights as much as 3/16" taller than stock. 1936–’54 must use the 1955–’64 style inner steel primary cover. Since all S&S generator style crankcases use 1958 and later style main bearings, stock flywheel assemblies 1957 and earlier cannot be used in S&S crankcases. Flywheel assemblies must have 1958 and later pinion shaft with 1.250" diameter bearing, and a 1954 and later style sprocket shaft designed for a Timken® main bearing. Generator style cases for 1936–’47 knucklehead engines are machined to supply oil to the heads from a boss located near the rear tappet guide or from a stock or S&S gearcover. Provision for oil scavenging from the heads in these crankcases is the same as stock, with passageways that connect the tappet guides to the crankcase breather gear. Crankcases for 1948–’69 engines are machined with a provision to separate the oil supply to the top and bottom ends if an S&S oil pump is used. This feature lets you choose the 1972 and earlier stock "side oiling" system or the 1973 and later split oil system. The stock cast iron oil pump can be used for the "original look" and stock oiling system. If an S&S billet oil pump, part #31-6200 ± is used, the oiling system can be set-up as stock or updated to a split system. 1963–’65 panhead engines, with outside oil supply lines to the cylinder heads, must use the oil supply port located behind the rear tappet guide or the oil fitting toward the rear of the S&S gearcover. S&S generator style crankcases do not have the stock style "outside oiler" oil supply boss, so special oil supply lines will need to be fabricated.

124 S&S Vintage 1926–1999 Order 608-627-1497