Tekno RC NB48.4 Building Instructions

Introduction

Additional equipment and parts needed:

•

Paint for body

•

.21 nitro engine, tuned pipe, manifold and glow plug

•

High torque steering & brake servos (at least 300 oz/in)

•

RX battery, switch and harness

•

1/8th scale tires, wheels & CA glue (or premounts)

•

Fuel bottle, fuel, 1/8th buggy starter box and glow ignitor

Tools needed:

•

Hex drivers 1.5mm (TKR1104), 2.0mm (TKR1105), 2.5mm (TKR1106)

•

Nut drivers 5.0mm (TKR1107, 5.5mm (TKR1108), 7.0mm (TKR1109)

•

Hobby knife

•

Needle-nose pliers

•

Shock tool (TKR1115) OR adjustable (Crescent) wrench (for shock assembly)

•

17mm Wheel Wrench (TKR1116)

•

4mm turnbuckle wrench (TKR1103) - 5.5/7.0 two sided wrench (TKR1119)

•

4mm arm reamer (or #19 drill bit)

Disclaimer: Tekno RC is not responsible or liable for any property or personal damage, loss, or injury incurred as a

result of using this product. This kit is meant for use by persons 14 years of age or older and in the strict connes of

a legally permitted RC track or facility.

Warnings: Always double-check that your radio gear is working properly before operating vehicle. Never operate the

vehicle indoors (unless the RC track is an indoor facility). Use caution while operating vehicle so as not to collide with

people who may be turn marshalling or who might otherwise not be aware that a fast moving RC vehicle is in the vicinity.

Warranty: We warrant that the parts included in this kit are free from defects. If you nd a defective part in your kit,

please contact us @ [e-mail] and we will help you to resolve the issue. We do not warranty parts that may be

broken during operation of the vehicle or otherwise. Refer to the end of this instruction manual for a listing of

spare/replacement and option parts. All spare parts and other info are available on our website (www.teknorc.com)

and through our network of domestic and international dealers and distributors.

Thank you for purchasing the Tekno RC NB48.4 1/8th Scale 4WD Competition Nitro Buggy Kit.

We are always working on new projects, so please check our website

at www.teknorc.com or our Facebook page at www.facebook.com/teknorc

for the latest news, parts, and kits.

Take your time! When you work your way through these building instructions, keep an eye out
for the following important indicators below:

•

RED TEXT - This indicates important areas of the build process that should be observed.

•

YOUTUBE - We also have many useful build videos on Youtube, so be sure to check these out!

https://www.youtube.com/c/teknorc

Thread Lock icons

Thread lock is always used when a screw is inserted into any metal part. (Included with kit)

Thread

Lock

Grease icons

Grease is usually used on any areas with movement and for sealing. (Included with kit)

Grease

TKR5150

TKR5149

*TKR5149A

(Option)

Grease

Grease

TKRBB08165

TKR5144

TKR5145B

TKR5150

Apply grease to the groove in the outdrive

Apply grease to the groove

where the o-ring is placed

as well as the o-ring itself

Fill with 10,000 wt oil to

1mm below full

DO NOT OVERFILL

Diff

Oil

Bag A

Center Differential
(overview)

TKR5415C

TKR5149

TKR5150

TKR5150

TKR5143

TKR5113

TKR1325
M3x14mm Flat Head Screw

x4

TKR5144

TKR5145B

TKRBB08165
Ball Bearing (8x16x5mm)

x2

TKR5144
Differential 0-rings

x2

TKR5145B
Differential Shims (6x17mm)

x2

TKR1325 x4

TKR5112X

TKR5112X

TKR5144

Grease

Grease

Step

A-2

Step

A-1

Step

A-4

Step

A-3

*TKR5149A

(Option)

Apply a liberal

amount of grease in the

areas between the shims

and o-rings, as well as

around the outdrive and

both sides of the seal

TKR5415C

3

*TKR5149A

(Option)

TKR8151B

TKR5149

TKR5150

TKR5150

TKR5143

TKR5113

TKR5114XB

TKR5114XB

TKR5144

Apply grease to

the groove

where the o-ring

is placed

as well as the

o-ring itself

Apply grease to the

groove in the outdrive

TKR5144

TKR5145B

TKR1325 x4

TKR5143

TKR8151B

Grease

Grease

TKR1325
M3x14mm Flat Head Screw

x8

TKRBB08165
Ball Bearing (8x16x5mm)

x4

TKR5144
Differential 0-rings

x4

TKR5145B
Differential Shims (6x17mm)

x4

Grease

Grease

Repeat for rear di

Repeat for rear di

Repeat for rear di

Repeat for rear di

Fill FRONT with 10,000 wt oil

Fill REAR with 7,000 wt oil

to 1mm below full
DO NOT OVERFILL

Bag B

Front and Rear Differential
(overview)

Step

B-1

Step

B-3

Step

B-4

Step

B-2

Diff

Oil

TKRBB08165

TKR5150

TKR5144

TKR5145B

TKR5150

Apply grease to the groove

where the o-ring is placed

as well as the o-ring itself

Apply grease to the groove in the outdrive

TKR5149

*TKR5149A

(Option)

4

TKR5075

TKR5012

TKR8152B

TKR5012

TKR5268

TKR1222

TKR1222

TKR1525

TKR1525

TKR1222

TKR1222

TKR1226

TKRBB05114

TKR1525
M3x14mm Cap Head Screw

x6

TKR1603
M5x4mm Set Screw

x1

TKR1222
13x16x0.1mm Diff Shim

x2

TKR1226
5x7x0.2mm Shim

x1

TKR1603

TKRBB05114

TKRBB05114

TKR8152B

TKR1226

TKRBB05114

TKR1603

TKR1525TKR1525

Front

Rear

Note: at spot

Note: at spot

Note: The front and rear of

the car use dierent inner

bulkheads.

The front is angled

whereas the rear is

only slightly angled.

*These may not be needed

*These may not be needed

*These may not be needed

*These may not be needed

Grease

Bag C

Front Gearbox
(overview)

Thread

Lock

Step

C-1

Step

C-2

Step

C-3

TKRBB05114
Ball Bearing (5x11x4)

x2

TKR1525 x6

5

Note Step C-2: To properly shim the di, start by test tting the di with no shims and check for

side to side play. If no (or very little) play is present, then continue on to the next step. If you feel

excessive side to side play, then start by adding one shim on the gear side of the di assembly. This

will move the mesh tighter and remove any play. If the mesh is too tight at this point, move the shim

to the other side. In some rare cases, two shims may be necessary.

TKR1222

TKR1222

TKR1525
M3x14mm Cap Head Screw

x4

TKRBB05134
Ball Bearing (5x13x4)

x2

TKR1222
13x16x0.1mm Diff Shim

x2

TKRBB05134

TKRBB05134

TKR8152B

TKR1603

TKR1525TKR1525

Front

Note: at spot

Rear

Note: at spot

TKR1603
M5x4mm Set Screw

x1

TKR1226
5x7x0.2mm shim

x1

Inner Bulkheads

TKR5075

TKR5016B

TKR8152B

TKR5016B

TKR5269

TKR1222

TKR1529

TKR5181

TKR1525

TKR1222

TKR1525

TKR1226

TKRBB05134

TKRBB05134

TKR1603

TKR1525

TKR1529

TKR1529
M3x20mm Cap Head Screw

x1

Grease

Bag D

Rear Gearbox
(overview)

Step

D-1

Step

D-2

Step

D-3

Thread

Lock

Note: The front and rear of

the car use dierent inner

bulkheads.

The front is angled

whereas the rear is

only slightly angled.

*These may not be needed

*These may not be needed

*These may not be needed

*These may not be needed

TKR1226

6

Note Step D-2: To properly shim the di, start by test tting the di with no shims and check for

side to side play. If no (or very little) play is present, then continue on to the next step. If you feel

excessive side to side play, then start by adding one shim on the gear side of the di assembly. This

will move the mesh tighter and remove any play. If the mesh is too tight at this point, move the shim

to the other side. In some rare cases, two shims may be necessary.

TKR5213A

TKR5213A

TKR1522

TKR5310

TKR5368

TKR5345B

TKR1522

TKR5213A

TKR5314B

TKR1601

TKR1601

TKR5336B

TKR5362

TKR5368

TKR5336B

TKR5345B

TKR5310

TKR1402

TKR5338

TKR1402

TKR5368

TKR5314B

TKR5314B

TKR5310

TKR1402

TKR5215B

Bag E

Center Differential Assembly
(overview)

Step

E-1

Step

E-3

Step

E-4

Step

E-2

TKR1522

TKR5310

TKR1322

TKR1522

TKR5215B

TKR5336B

TKR1601

TKR5341

TKR1322

TKR1322
M3x8mm Flat Head Screw

X2

TKR1402
M3x8mm Button Head Screw

x4

TKR1522
M3x8mm Cap Head Screw

x4

TKR1601
M3x4mm Set Screw

x2

Thread

Lock

7

Note: Brake lever alignment

4mm

Pre-thread all brake

post holes with a

separate M3 screw

Note: Tighten brake posts

(TKR5213A) all the way

down and then back o

1/2 TURN. This will

ensure your brake discs

are free while on throttle.

Rear Front

Note: Orientation of the brake cams TKR5215B.

The rear cam should be pointing up & the front cam

should be pointing down.

TKR1529

TKR1201

TKR1221

TKR1221

TKR1201

TKR1529

TKR1529
M3x20mm Cap Head Screw

x4

TKR1524
M3x12mm Cap Head Screw

x6

TKR1201
M3 Lock Nut Black

x2

TKR1221
M3x8mm Washer

x2

Step

F-1

Step

F-2

TKR1524

TKR1524

TKR5181

Bag F

Low Profile Wing Mount

8

SETTINGS

1 2
3 4

1 2
3 4

POSITION SETTINGS

1 - REARWARD LOW 2 - FORWARD LOW

3 - REARWARD HIGH 4 - FORWARD HIGH

DOWNFORCE SETTINGS

(downforce angles)

Note: Stock position setting is

#2, Forward Low

Note: Stock downforce setting is 4

°

4

°

7

°

10

°

Stock Position

(”D” Block)

Stock Position

(”C” Block)

30.2

TKR1601

TKR1601

TKR1601

TKR5086

TKR5491 - 2.4mm

TKR5086

Note: Loosen the M3x4 set screw (TKR1601)

if

the sway bar does not

turn freely.

Note: Do not overtighten

TKR5049A

TKR8163

TKR8164

TKR5165

TKR8184

TKR5174

TKR1402

TKR1601

TKR5079A

TKR1522

TKR1522
M3x8mm Cap Head Screw

x2

TKR1525
M3x14mm Cap Head Screw

x2

Bag G

Rear End

*TKR5490 - 2.3mm
*TKR5492 - 2.5mm
*TKR5493 - 2.6mm
*TKR5494 - 2.8mm
*TKR5495 - 3.0mm

(Option)

Thread

Lock

Thread

Lock

TKR1525

TKR1533
M3x40mm Cap Head Screw

x2

TKR1238
M4x10mm Droop Screw

x2

TKR5049A
Pivot Ball Sway Bar

x2

TKR5079A
Stabilizer Ball

x2

TKR1529
M3x20mm Cap Head Screw

x2

TKR1533

TKR1238

TKR1529

TKR1601
M3x4mm Set Screw

x6

Step

G-1

Step

G-2

Step

G-3

TKR5020

TKR1402
M3x8mm Button Head Screw

x4

TKR5165

Note: With these stock settings,
Anti-Squat = 2° / Rear Toe = 2.5°

For reference, with center dot

inserts in both braces,

Toe = 3° / Anti-Squat = 2°

Use a #19 drill bit or

4mm reamer to ream

arms until hinge pin

falls through freely.

9

Install the sway bar ball onto the

sway bar wire until the end of

the wire is ush with the ball

collar as

pictured above.

Front

Rear

Pivot Ball Orientation

TKR8087

TKR8034

TKR5165

TKR1201

TKR1201

TKR1601

TKR5165

TKR1201
M3 Locknut Black

x4

Step

H-1

Step

H-2

Changes to the wheelbase have a dramatic eect on handling,

since it shifts the distribution of weight over the rear wheels.

This adjusts traction. By shortening the wheelbase at the rear, you

are placing more weight over the rear wheels.

Changes to the wheelbase also change the amount of sweep the
rear driveshaft will have. More driveshaft sweep creates an eect

similar to anti-squat, where the rear end gets pushed upwards on

throttle. This helps reduce chassis slap when landing jumps on throttle.

(FRONT)

(REAR)

TKR1603
M5x4mm Set Screw

x2

TKRBB13194
Ball Bearing (13x19x4)

x2

TKRBB08165
Ball Bearing (8x16x5)

x2

TKR5071
M3x16.8mm Pin

x2

TKR1601
M3x4mm Set Screw

x4

Bag H

Rear Hub/CVA Assembly

10

Thread

Lock

Note: Notch on pin

needs to line up

with set screw.

TKR8040A

TKRBB13194

TKRBB08165

TKR5071
*TKR5071B
*TKR5071C
*TKR5071X

(Option)

TKR1603