OFNA Racing 2-Speed User Manual
1/10 SCALE 2-SPEED TRANSMISSION SET (Shoe Type)
INSTRUCTIONS
#35016 NITRO OB-4
* This professional two speed transmission is only for Nitro OB-4 1/10 Scale OB4 Gas Car Kits.
Nitro Ob4 ASSEMBLY OF THE TWO SPEED GEAR
(45T GREEN and 41T PINK)
35933
2.6 X 3mm
Flat Head
Screw
Glue
crew
S
* Apply Screw Glue.
35953
41T
Spur Gear
( Pink )
35321
2nd Gear
Clutch Bell
( Ball Bearing )
Adjustment
Hole
37550
10x15x4mm
Ball bearing
35933
2.6 X 3mm
Flat Head
Screw
* Assembly the 1st gear
carrier as shown.
* Apply Screw Glue.
e
Glu
ew
cr
S
35952
45T
Spur Gear
( Green)
35322
1st Gear Carrier
(One-Way)
35326
One-Way
Bearing
3
35329
4 X 4mm
Set Screw
35324
Clutch Shoe
Carrier
* Put the spacer
before assembly
clutch shoe carrier.
35324
Clutch Shoe
Carrier
* Put the shoe carrier in
the "D" cut.
5
35330
Spacer
35330
Spacer
* 2 speed transmission
after assembly.
4
35329
M2x10mm
Hex Screw
35329
Spring
35323
Clutch
Shoe
35323
Clutch
Shoe
35329
Balance
35329
M3x3mm
Set Screw
35329
M3x3mm
Set Screw
* Use a 500 grit sand paper and flat
surface to sand the shoe flat.
Sand Paper
Desk
35329
Balance
35329
Spring
35329
M2x10mm
Hex Screw
* Assembly the parts that come with your kit.
6
4mm
E-Ring
* Screw the M2x10mm screw into
the bottom and back off 5 turns.
M2x10
Screw
M2x10
Screw
* Notice the direction of
the gear as shown.
37050
Pulley Mount
37661
17T Pulley
37661
Pulley
Washer
37400
2 x 8.8
Pin
ASSEMBLY OF THE 2 SPEED CLUTCH GEAR
35951
Clutch Bell
35950
18T 2nd
Clutch gear
34110
5 x 10
Ball bearing
35958
5 x 8mm
Ball Bearing
WHEN USING THE NEW CLUTCH TYPE 2-SPEED TRANSMISSION, YOU WILL NOTICE THE SECOND GEAR SHIFT ACTION IS LESS AGGRESSIVE, LEAVING YOU WITH BETTER
CONTROL. OFNA OFFERS A WIDE SELECTION OF GEAR RATIO CHOICES, USE THE BEST RATIO FOR YOUR TRACK LENGTH. REMEMBER DO NOT OVER REV YOUR ENGINE.
35949
14T 1st
Clutch Gear
3 x 8
washer
3 x 5mm
Screw
CHECK THE GEAR BACKLASH OF THE CLUTCH GEAR
AND SPUR GEAR
Note Book
Paper
* Use note book paper to set gear backlash between spur and clutch bell gear.
If the space is not correct the spur gear will be damaged.
* Loosen or tighten your engine mount screw to adjust the mesh of the spur gear
and clutch bell.
ADJUSTING THE SHIFT POINT
* Adjust the engine before adjusting the clutch shift timing.
Adjust the engine as per engine instruction manual.
3x3
Set Screw
1) Use a 1.5mm allen wrench to
set the clutch shoe.
2) Adjust the 3x3 set screw to set the air gap
distance between the clutch shoe and
2nd speed clutch bell.
3) Adjusting the M2x10mm screws, will
change the shift timing of the clutch
shoe. Adjust both screw the same
amount of turns
Slight
Air Gap
1.5mm
Allen Wrench
1. Once the engine adjustments have been completed, proceed to the
adjustment of the clutch shoe shift timing.
(Using a 1.5mm allen wrench to adjust the clutch shoe.)
Note:
Clockwise--------------Shift timing will become slower.
Counter clockwise---Shift timing will become quicker.
2. Adjust the clutch shift timing for your track conditions.
As you tighten (Clockwise) the 2x10mm screw , the shift timing will become
slower.
As you loosen (Counter clockwise ) the 2x10mm screw, the shift timing will
become quicker.
3. Set the shift timing to the track conditions while the car is running.
M2x10
Screw
Counter-clockwise
(Loosen)
Clockwise
(Tighten)
2 SPEED GEAR RATIO COMBINATIONS
IMPORTANT:
The sum of the spur gear and clutch gear for1st gear must be equal
the sum of the spur gear and clutch gear for 2nd gear . be equal
Example:
( STANDARD)
SPUR GEAR
45T/41T 13T/17T 14T/18T 15T/19T
44T/40T
43T/39T
42T/38T
41T/37T
( OPTION)
SPUR GEAR
45T/42T
44T/41T
43T/40T
42T/39T
41T/38T
SPUR GEAR(1st):
USA Parts No.
SPUR GEAR(2nd):
USA Parts No.
N0.
35956 Z10 & Rs4 Main Shaft
35321 2nd Gear Clutch Bell
35322 1st Gear
35323 Clutch Shoes
35329 Spring, Balance, Hex Screw
35330 Spacer, HPI Trany
1st gear 45+13=58
2nd gear 41+17=58
CLUTCH GEAR
(4 tooth difference)
CLUTCH GEAR
(3 tooth difference)
13T/16T 14T/17T 15T/18T
2 SPEED OPTION PARTS
Description
35952 45T Spur Gear (olive)
35965 44T Spur Gear (white)
35934 43T Spur Gear (blue)
35942 42T Spur Gear (red)
35953 41T Spur Gear (pink)
Description
35964 40T Spur Gear (gray)
35935 39T Spur Gear (yellow)
35963 38T Spur Gear (orange)
35943 37T Spur Gear (green)
2 SPEED PARTS
Description
Carrier
Must be equal
CLUTCH GEAR:
USA Parts No.
35948 13T (1st)
35949 14T (1st)
35940 15T (1st)
35944 16T (1st)
35947 17T (2nd)
35950 18T (2nd)
35941 19T (2nd)
35945 20T (2nd)
N0.
35324 Clutch Shoe Carrier
35325 M2x10mm Hex Screw
35326 One-Way Bearing
37550 10x15x4mm Bearing
16T/20T
16T/19T
Description
Description
Short Track
Torque
Top Speed
Long Track
Short Track
Torque
Top Speed
Long Track
Loading...