2008 Honda CBR 125 Speedo Dial Trapped

the speed sensor next the starter motor
sends a voltage pulse to the speedometer.

If you can get at the connectors
just down from the speedo you can
check for this pulse.

Block the back wheel off the ground.
Unplug the connectors and hook
a volt meter to the pink/green +
and the green/black - wires
on the harness side not the speedo side.

Turn on the key and then
check for a 0-5 volt pulse
when you turn the wheel forward
slowly.

If you have a pulse the speed sensor
is likely okay and your speedo
circuit board is faulty.

If you get no voltage pulse then you have
to check the pulse closer to the
speed sensor or check the connectors
and wires for faults.
No pulse can be a faulty speed sensor
or just a bad connection.
Have you checked the fuses well?

Chances are your speedo cable is starting to wear.. on both ends of the cable there will be little plastic pins that stick out, when you put the cable back in you need to make sure that these pins (they are flat rectangle shape) insert into the correct place and align up properly.. but it sounds like your going to have to replace the speedo cable, its a simple job once get a new one..

just change the cable from the speedo to the tire

CHECK YOUR VECHICLE SPEED SENSOR WIRE FOR DAMAGE.OR THE MAGNET GEAR ON TRANSMISSION OUT PUT SHAFT IS BROKEN OR DAMAGE.IF THEY ARE GOOD YOUR PROBLEM IS IN THE DASH.BROKEN SPEEDOMETER.

it may have snapped in the middle of the cable or check the drive in the front wheel

There are reservoirs near each brake actuator. if they are empty the brakes need bleeding to remove trapped air, otherwise they will not work. Take it to a mechanic.

take out the front wheel remove the drive it should tap out with a bit of gentle tapping they are not that tight fitting