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20

VIDEO TECH TIP

HOW TO BUILD 

CENTER SHOCK

4. SHOCK ABSORBER

Gently push the shock shaft 

completely  into  the  shock 

body.  Excess  oil  will  flow 

through  the  hole  in  the 

shock cap.

Keep  the  shock  shaft 

pushed  in  the  shock  body 

and tighten the shock cap 

completely. 

Tighten  the  cap  fully  but 

do  not  overtighten  or  the 

rubber membrane may be 

damaged.  Make  sure  that 

there  is  no  oil  leakage 

after the cap is tightened.

HALF TIGHTEN

TIGHTEN FULLY

100%

Extend  the  shock  shaft 

completely.  Fill  the  shock 

body with the shock oil. 

Move the shock shaft up and 

down a few times to release 

the  air  bubbles  trapped 

beneath the piston.

Orient  the  filled  shock 

vertically  for  several 

minutes  with  the  shock 

shaft  fully  extended.  The 

remaining air bubbles will 

release.

Install 

the 

shock 

membrane into the groove 

in the upper shock cap.

Gently place the shock cap 

assembly  onto  the  filled 

shock  body.  Excess  oil  will 

spill from the shock. Screw 

the shock cap onto the body 

by only a few turns, approx. 

50%.  Excess  oil  will  flow 

through  the  hole  in  the 

shock cap.

3~5x

UP & DOWN

50%

Follow the steps below to set the shock.

Oil 

450St

DEFAULT SHOCK SETTING FOR SHOCK ABSORBER

Shock Oil

Shock Oil

971022

O 2x2

OIL

OIL

Summary of Contents for X12'21

Page 1: ...I N S T R U C T I O N M A N U A L X12 21 EU US EDITION...

Page 2: ...to assemble the model correctly and to allow the model to reach its performance potential Exercise care when using tools and sharp instruments Take care when building as some parts may have sharp edg...

Page 3: ...l use or cover or imply how long any model cars components or electronic components will last before requiring replacement Due to the high performance level of this model car you will need to periodic...

Page 4: ...w of the parts to be assembled There is also a list of all the parts and part numbers that are related to the assembly of that section The part descriptions are color coded to make it easier for you t...

Page 5: ...4MM 1 5 2 372292 STEEL SHIM 0 2MM SILVER 2 372293 STEEL SHIM 0 4MM BLACK 2 372294 STEEL SHIM 0 6MM GOLD 2 372297 ALU SHIM 4x6x1 0MM 10 372298 ALU SHIM 4x6x0 5MM 10 372320 COMPOSITE ARM BUSHING 4 37265...

Page 6: ...ed Recommended for tight technical tracks or tracks with numerous 180 hairpin corners CASTER ADJUSTMENT SETTING Caster is adjusted by the shims placed under front ball Please see the table beneath the...

Page 7: ...ring feel similar to that of the old X12 Provides a good balance between initial response and cornering speed REARWARD POSITION Makes the car freer because of increased Ackermann less steering lock on...

Page 8: ...itions There are 1 and 2 camber king pin axles optionally available 0 5mm STEEL DECREASING THE CAMBER ANGLE will decrease the steering which will make the car easier to drive and also helps to prevent...

Page 9: ...ear solid axle is used FRONT DROOP Front droop is adjusted by the preload of the front spring More shims between the steering block and the spring will increase preload and decrease droop Removing shi...

Page 10: ...EAR POD UPPER PLATE 2 5MM 373585 SIDE SPRING C 0 9 GOLD 2 373591 COMPOSITE SIDE SPRING HOLDER 2 378141 ALU SIDE TUBE 2 378153 COMPOSITE SIDE TUBE SHAFT 2 901308 HEX SCREW SB M3x8 10 902256 HEX SCREW S...

Page 11: ...NSION 903305 SFH M3x5 903305 SFH M3x5 902305 SH M3x5 NOTE ORIENTATION The amount of shims has a direct effect on the pivot mounting position Please see PAGE 12 INITIAL SETTING rear pivot position 1mm...

Page 12: ...ENSION Do not tighten fully pivotballs must move freely Do not tighten fully pivotballs must move freely 902258 SH M2 5x8 902256 SH M2 5x6 THREAD LOCK PIVOT MOUNTING ALTERNATIVE REARWARD INITIAL SETTI...

Page 13: ...IL POD LINKAGE POSITION OUTER POSITION INITIAL SETTING LESS ANGLED side links make the car easier to drive INNER POSITION MORE ANGLED side links give increased in corner steering CLICK 0 5mm For batte...

Page 14: ...2306 SH M3x6 960031 ALU N M3 960032 N M3 1mm 1mm 303122 SHIM 3x6x1 902306 SH M3x6 6mm THREAD 6mm THREAD The shims used under the ball stud have a direct effect on shock angle See PAGE 22 SHOCK ANGLE S...

Page 15: ...different oil thicknesses depending on track conditions OIL For HIGH grip use SOFTER oils For LOW grip or ASPHALT use HARDER oils SIDE TUBE ANGLE DETAIL The angle of the side tubes has a fine effect o...

Page 16: ...HER ST 3x8x0 5 10 963030 375051 375031 908258 902305 375080 375880 375080 375040 375040 375093 375093 930138 960031 941438 941438 930130 941438 375010 372070 372070 375090 375090 375000 375876 375093...

Page 17: ...track width is set To set the track width more easily set the car on a ruler or use a digital vernier caliper Rear track width is directly affected by wheel offsets which can vary depending on tire b...

Page 18: ...3x8 960031 ALU N M3 375090 6 4x8 4x1 0 375093 6 4x8 4x6 0 375090 6 4x8 4x0 5 908258 SCH M2 5x8 NOTE ORIENTATION NOTE ORIENTATION Bearing Oil HUDY 106230 Diff Grease HUDY 106211 NOTE ORIENTATION 8 0mm...

Page 19: ...ton from the frame and remove all excess plastic flash 4 SHOCK ABSORBER 378002 SHOCK ABSORBER SET BLACK 378011 COMPOSITE SHOCK PARTS FRAME 378020 ALU THREADED SHOCK BODY HARDCOATED 378030 K ALU SHOCK...

Page 20: ...body with the shock oil Move the shock shaft up and down a few times to release the air bubbles trapped beneath the piston Orient the filled shock vertically for several minutes with the shock shaft...

Page 21: ...052 O RING FOR 1 10 ON ROAD SET UP WHEEL 4 902304 HEX SCREW SH M3x4 10 902305 HEX SCREW SH M3x5 10 902308 HEX SCREW SH M3x8 10 902310 HEX SCREW SH M3x10 10 903306 HEX SCREW SFH M3x6 10 903308 HEX SCRE...

Page 22: ...e shock absorber affects the amount of droop To adjust thread the ball joint on or off the bottom spring cap or adapter See PAGE 25 for more information about Ackermann settings 903306 SFH M3x6 MORE S...

Page 23: ...FINAL ASSEMBLY F 25T H 24T K 23T Use the adapter that matches the steering servo SERVO SAVER Servo Screw NOT INCLUDED 6mm THREAD CENTER CENTER DETAIL Make sure to center the servo saver along the cha...

Page 24: ...THREAD THREAD 26mm 21mm 26mm 21mm STEERING BLOCK 2x 5 FINAL ASSEMBLY STEERING LINKS FOR FORWARD HOLE ON STEERING BLOCK INITIAL SETTING STEERING LINKS FOR REARWARD HOLE ON STEERING BLOCK STEERING BLOC...

Page 25: ...ll studs on the forward side of the servo saver FRONT HOLE FRONT HOLE FTONT HOLE REAR HOLE REAR HOLE REAR HOLE REAR HOLE FTONT HOLE MICRO STANDARD servo MICRO STANDARD servo MICRO STANDARD servo STAND...

Page 26: ...4 24T OPTION 305975 25T OPTION 305976 26T OPTION 305977 27T OPTION 305978 28T OPTION 305979 29T OPTION 305980 30T OPTION 305981 31T OPTION 305982 32T OPTION 305983 33T OPTION PINION GEARS ALU HARDCOAT...

Page 27: ...roller NOT INCLUDED 5 FINAL ASSEMBLY Adjust the gear mesh so there is appropriate space between the spur gear and pinion teeth There should be a very small amount of freeplay GEAR MESH 902308 SH M3x8...

Page 28: ...moval The X12 has 4 battery mounting positions The more forward the battery is the car will be easier to drive but it will be less responsive The more rearward the battery is the car will be more aggr...

Page 29: ...most conditions Do not use for initial setting Do not use for initial setting STIFF Braces installed attached at front middle and rear This is the stiffest most stable setting Recommended for high tr...

Page 30: ...steering more responsive but more difficult to drive FRONT TRACK WIDTH 5 FINAL ASSEMBLY Bearing Oil HUDY 106230 GENTLY TIGHTEN the wheel nuts so the wheel turns freely but without excessive axial play...

Page 31: ...31 NOTE...

Page 32: ...i 8 i 8 i 8 8 V i 8 RC AMERICA 2030 Century Center Blvd 15 Irving TX 75062 USA PHONE 214 744 2400 FAX 214 744 2401 xray rcamerica com...

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