RACE TECH HI-PERFORMANCE SPRING KIT
ATV FRONT RACE SERIES 
YAMAHA YFZ450R

<IP_QFSKR05.doc>              E Rios-Race Tech 7-28-2010 

INCLUDES qty 2 of each: Main Springs, Secondary Springs, NPL Spring, NPL Collar, Type-1 Go-Between, Type 2 Go-Between and Lower Spring Retaining Collar. 

TOOLS REQUIRED: Service Manual, Vise with Soft Jaws TMVJ 065 or equivalent, TSPA 01 Preload Adjusting Tool or Spanner Wrench, ¼” Flat Blade Screwdriver, File, TSSM 01 Sag Master, Calipers, and Hydraulic Spring Compressor.

 

DIGITAL VALVING SEARCH (DVS) printout: See DVS at www.racetech.com for your custom spring setup specs.

Support the front of the ATV securely; remove front shocks per the procedure in your service manual.  Install the Race Tech Spring Kit as follows:

Note: Click on the images to enlarge.

Disassembly

D1 Clamp Shock into a vise with Soft Jaws.

D2 Loosen Lock Ring.

D3 Remove all spring preload by unscrewing the collars. Use a Spanner Wrench if necessary.

D4 Use a small Screwdriver or similar tool to gently pry the Bottom-Out Bumper away from the end of the Shock. 

D5 Remove the C-Clip Spring Retainer by pulling the Spring down and sliding the Clip out from under the Bumper Cup.
 
D6 Remove the stock Spring.
 
D7 The stock Preload Collar and Lock Ring will be used with the Race Tech Spring Kit. It is a good idea to clean and grease the threads on both the Preload Collar and Lock Ring before installation of the Spring Kit.
 

Spring Kit Assembly

A1 Install the NPL Collar (single flange) with the long end of the Flange facing the bottom of the shock.

 

A2 Install the NPL Spring over the NPL Collar. The NPL Spring is the softest of the three springs.
 
 

A3 Install the Type-1 Go-Between Collar. There are two styles of Go-Betweens included in this Spring Kit; the Type-1 has the shortest flange of the two types on one side. The short flange side, which is 6.3mm or ¼” in should extend into the NPL Spring. 
 

A4 Install the Secondary Spring.
 
 

A5 Install the Type-2 Go-Between. The Type-2 Go-Between is reversible for tuning purposes. Running the shorter end into the Secondary Spring will cause the spring set to cross over onto the Main Spring later. Running the long end into the Secondary Spring will cause the spring set to cross over onto the Main Spring sooner. This tuning option can be used to affect things such as body roll and proper front end traction.
    

A6 Install the Main Spring.
 

A7 Install the Lower Spring Retainer. Follow the instructions included with the Race Tech Shock Spring Compressor Tool (TSSC 02) and compress the Spring set enough to allow space for the installation of the new Lower Spring Retainer.
 

NPL Gap Setup
 
A8 Refer to the DVS Specs from racetech.com. 
 
A9 Adjust the Preload Collar to set the Gap between the flanges of the NPL and Go-Between Collars.  Use a Caliper or Tape Measure.
 
A10   Tighten the Lock Ring against the Preload Collar being careful not to change the NPL gap.
 
A11 Repeat procedure for the second shock.