OFNA Racing Ultra GTP MBX - Manual (Page 42)

The #35011 2-speed transmission has a smoother gear change and
is less aggressive on the 2nd gear .
We offer many different pinion and spur gear combinations
which can be used for different tracks.
* Adjust the engine before adjusting the clutch shift timing.
Adjust the engine as per engine instruction manual.
1. Once the engine adjustments have been completed, proceed to the adjustment
of the clutch shift timing.
(Using a 2mm allen wrench to adjust the clutch shoes.)
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 3x15mm hex screw , the shift timing will become
slower.
As you loosen (Counter Clockwise ) the 3x15mm hex screw, the shift timing will
become quicker.
3. Set the shift timing to the track conditions while the car is running.
* Use a 2mm and 2.5mm allen wrench to
set the clutch shoes.
2mm and 2.5mm
Allen Wrench
Clockwise
(Tighten)
Counter-clockwise
(Loosen)
2 SPEED OPTION PARTS 2 SPEED SPARE PARTS
No.35249 49T Spur Gear (STD)
No.35248 48T Spur Gear
No.35247 47T Spur Gear
SPUR GEAR(1st):
Description
35225 1st Spur Gear Holder
35228 Alum. Nut (Counter-Clockwise)
35230 8x12mm Flange Ball bearing
35222 Center Shaft
34110 5x10x4mm Ball bearing
35221 Clutch Bell Base
35249 49T Spur Gear (1st)
35245 45T Spur Gear(2nd)
35234 2nd Spur Gear Clutch Bell
35235 Clutch Shoe Carries
35219 Alum. Nut (Clockwise)
35236 2nd Clutch Shoes
Misc Parts Spring
4mm Ball
35237 6x6mm Set Screw
3x15mm Hex Screw
35321 8x10x1.5mm Alum. Ring
Description
No.35246 46T Spur Gear
No.35245 45T Spur Gear (STD)
No.35244 44T Spur Gear
SPUR GEAR(2nd):
Description
No.35220 13T/17T Gear (STD)
No.35232 14T/18T Gear
No.35233 15T/19T Gear
CLUTCH GEAR:
Description
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: 1st gear 45+13=58
2nd gear 41+17=58
Must be equal
SPUR GEAR CLUTCH GEAR
48T/44T
47T/43T
(4 tooth difference)
49T/45T 13T/17T 14T/18T 15T/19T
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( STANDARD)
2 SPEED GEAR RATIO COMBINATIONS
Adjustment thru
this hole.
To Front
16T/20T
USA Parts No.
USA Parts No.
USA Parts No.
USA Parts No.
OFNA Racing-USA
Tel:949-586 2910 Fax:949-586 8812
Made In Taiwan
M3x15
Hex Screw
M3x15
Hex Screw
ADJUSTING THE SHIFT POINT
* Two steps to adjust the shoes and shift timing.
6x6mm
Set Screw
6x6mm
Set Screw
1. Use a 2.5 mm allen wrench to
adjust shoe assembly air gap.
Tighten Set Screws, M6x6mm, to
adjust the air gap between the
shoe assembly and clutch bell
wall. Adjust both screws for an
even amount of gap of about
1mm.
2. Use a 2mm allen wrench to
adjust the shift timing. Turn,
M3x15mm, screws IN until
spring compresses, do not
crush! Back off screw 5 turns,
this is a good place to start.
When adjusting shift timing,
always turn each screw the
same number turns.
AIR GAP SETTING
SHIFT TIMING SETTING