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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

S&S Cycle logo
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640" Lift Triple Valve Spring Kit

 
$193.95
SKU:
90-2078
Qty:
 
Dealer Only Item

 
 
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Description
Product Reviews
Specs
Fitment
Instructions

FITMENT:

  • 1999–’04 Twin Cam 88®/88B™ with stock heads (5/16" valve stems)
  • 1984-’99 Evolution® with stock or S&S Super Stock® heads
  • 1986-’03 Harley-Davidson® Sportster® Models
  • 1994-’02 Buell® Models
  • All S&S Super Stock® heads (5/16" valve stems)

 

FEATURES AND BENEFITS:

  • Low mass titanium top collars for very high performance applications
     

KIT CONTENTS:

  • Valve keepers
  • Top & Bottom collars
  • Outer & Inner springs
  • Shims

 

Notes:

  • Use with shoulderless-style valve guides.
  • Special keepers included fit valves with stock 5⁄16" stems and S&S collars only.
  • Spring seat force is typically 170 lbs. at stock 1.800" installed height.
  • Open force is 390 lbs. at .560" lift, 415 lbs. at .630" lift.
  • May also be used in any other heads that require stock O.D. outer spring.
  • S&S springs will not fit 2005 - later stock heads because of the change invalve spring and valve stem diameter.

 

S&S® .640" Valve Springs Specifications – 1948-’84 Big Twin
Lift Installed Height Seat Force Force at Max Lift
.640" 1.800"" 170 lb. 419 lb.

 

 

Installation Notes:

High lift cams may require the engine builder to obtain additional clearance between the piston and valves, the intake and exhaust valves and the upper spring collar and rocker cover. Clearance should also be checked between the rocker arm and valve spring collar as well as between the rocker arm and rocker cover. It is imperative that the engine builder confirm these clearances and check for spring coil bind, even when using parts specifically designed for high performance. Most valve train failures can be traced to over-revving or failure to confirm correct clearances during assembly.

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