2009-2010 Yamaha WR250 X/R
PARTS LIST
Installation Instructions
1 Juice Box Pro™
1 USB Cable
1 Top Tune CD-ROM
1 Installation Guide
2 Zip ties
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
ITBR001-244 www.twobros.com 2009-2010 Yamaha WR250 X/R - 1
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 Tune softw are.
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)
2009-2010
Yamaha WR250X
2009-2010
Yamaha WR250R/X
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 s oftware by double-clicking the program icon ins talled 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 map 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 To p Tu ne
software allows a value of +250 to -100 in each cell.
ITBR001-244 www.twobros.com 2009-2010 Yamaha WR250 X/R - 2
Figure A Figure BFigure C
1. Remove the seat.
2. Remove the fuel tank.
3. Remove both side covers as shown in Figure A.
remove
remove
4. Remove the bolt securing the headlight as shown in Figure B on both sides.
5. Remove the headlight.
remove
6. Using the supplied zip ties, secure the Juice Box Pro to the bottom of the
headlight as shown in Figure C.
ITBR001-244 www.twobros.com 2009-2010 Yamaha WR250 X/R - 3
Figure DFigure E
7. Route the Juice Box Pro harness through the cable guide on the left hand side of
the frame as shown in Figure D.
Juice Box Pro
harness
8. Route the Juice Box Pro harness between the frame and coolant reserve bottle as
shown in Figure E.
9. Continue to route the harness above the engine and go towards the throttle body.
Juice Box Pro
harness
10. Unplug the stock wiring harness from the injector as shown in Figure F.
unplug
Figure F
ITBR001-244 www.twobros.com 2009-2010 Yamaha WR250 X/R - 4
Figure GFigure HFigure I
unplug
11. Attach the connectors from the Juice Box Pro to the stock injector and the stock
wiring harness as shown in Figure G.
12. Locate the Throttle Position Sensor (TPS) connector.
The TPS connector is covered with a black rubber boot and is located on the right
hand side of the throttle body as shown in Figure H.
13. Unplug the TPS connector as shown in Figure H.
14. Attach the connectors from the Juice Box Pro to the stock TPS connector and the
stock wiring harness as shown in Figure I.
ITBR001-244 www.twobros.com 2009-2010 Yamaha WR250 X/R - 5
Figure J
15. Attach the ground wire from the Juice Box Pro to the negative side of the battery
as shown in Figure J.
16. Reinstall the side covers.
ground wire
ITBR001-244 www.twobros.com 2009-2010 Yamaha WR250 X/R - 6
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