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2011 Honda CBR250R
PARTS LIST
Installation Instructions
1 Juice Box Pro™
1 USB Cable
1 Top Tune CD-ROM
1 Installation Guide
2 Velcro strip
1 Alcohol swab
1 Posi-tap
THE IGNITION MUST BE TURNED
OFF BEFORE INSTALLATION!
DOWNLOAD THE TOPTUNE SOFTWARE
AND LATEST MAPS FROM OUR
WEBSITE:
www.twobros.com
PLEASE READ ALL DIRECTIONS BEFORE STARTING INSTALLATION
401 S. Grand Ave. Santa Ana, CA 92705
(800) 211-2767 www.twobros.com
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Selecting the Map Position
The J uice Box Pro co mes loaded w ith up to ten m aps. U s ing a #1 Phillips
screwdriver, turn the map select dial to toggle be tween the loade d m aps. R efer to
the map position table below for the maps included in your Juice B ox Pro.
Using the RPM Range Dials
The Low, Mid, and High RPM Dials refer to the RPM range, in thirds, of your
vehicle. Each dial allows +/- 10% fuel adjustment on top of what fuel changes are
done in the map. With the dial facing straight up, there is no additional fuel change.
For example, if your vehicle revs to 15,000 RPM:
• the low RPM dial will adjust 0-5000 R PM
• the mid RPM dial will adjust 5001-10000 RPM
• the high RPM dial will adjust 10001-15000 RPM
Using Top Tune
Take y ou r tuning to the next level w ith the Top Tun e s oftware.
Position 0 Zero map
Position 1 Stock exhaust
Stock air fi lter
Position 2 Two Brothers slip-on
Stock air fi lter
USB Port
High RPM Dial
Mid Dial RPM
Low Dial RPM
Map Select
Status Light
(Power to Unit)
2011
Honda CBR250R
2011
Honda CBR250R
I ns t a l li n g t h e Top Tu ne S o ft w a r e
1 Insert the CD provided into your computer’s cd-rom drive. The launch program
will run automatically.
If auto-run is disabled, double-click the My Computer icon then double-click the
CD drive icon. Double-click TB R Top Tune.exe to manually start the CD.
2 Click Install S oftware and follow the on-screen instructions to install the Top
Tune software. The Top Tune software and maps will be stored in C:\Program
Files\T BR Top Tune.
3 C lick M ap Databas e. All m aps will a uto matically be ins talled to the C:\Pr ogram
Files\TBR Top Tune\maps folder.
Loading Additional Maps
1 Connect the US B cable from the computer to the Juice Box Pro. Verify the cable
is fully seated in the J uice B ox Pro.
2 Run the Top Tune software by double-clicking the program icon installed on your
desktop or on your start menu.
3 Click Open Map File and select a map file.
4 C lick Send M ap. You can send the ma p to any of the ten m ap positions.
A ltering M aps Us ing Top Tune
The values in the map represent a percentage of fuel change over stock. A value of
10 in the map indicates at that throttle position a nd RPM range the v ehicle w ill be
10% richer than stock. If the value is -10, then it would be 10% leaner than stock. You
ha ve the ability to fine tune y our fuel curve by altering these values . The Top Tune
software allows a value of +250 to -100 in each cell.
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FIG.A
1. Remove the seat.
2. Using the supplied velcro, secure the Juice Box Pro to the top of the battery as
shown in Figure A.
Make sure to clean both surfaces with the alcohol swab before attaching.
FIG.B
FIG.C
harness
unplug
bolt
3. Route the Juice Box Pro harness to the left side of the air box as shown in
Figure B.
Remove the bolt for the air box to allow the harness to be placed on the inside of
the frame. Reinstall the bolt once the harness has been routed.
4. Unplug the stock wiring harness from the fuel injector as shown in Figure C.
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FIG.D
FIG.EFIG.F
5. Attach the Juice Box Pro harness to the stock wiring harness and the fuel injector
as shown in Figure D.
6. Locate the Throttle Position Sensor (TPS) connector.
The TPS connector is located on the left side of the
throttle body as shown in Figure E.
7. Using the supplied posi-tap, connect the grey wire
from the Juice Box Pro to the yellow wire of the stock
harness.
8. Locate the stock O2 sensor connector.
The stock O2 sensor connector is located on the left side of the motorcycle near
the coolant line as it comes out the top of the radiator. This is a black connector
with a single blk/yel wire.
9. Unplug this connector from the main wiring harness.
10. Attach the Juice Box Pro harness to the stock O2 sensor and wiring harness as
shown in Figure F.
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FIG.G
ground wire
11. Attach the ground wire from the Juice Box Pro to the common ground location at
the regulator/rectifi er as shown in Figure G.
ITBR001-302 www.twobros.com 2011 Honda CBR250R - 5
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