Cause of Death Motorcycle Speedometer

Speedometer is very functional for us as riders. One was to show how we drove at speed now. Surely we have ever experienced motorcycle speedometer needle remained silent on the number 0 (zero) kph.
Signs that the speedometer problem as follows:
1 needle still pointing at the number 0 (zero) kph.
2 The needle pointer moves up and down when brought drove.
3 The needle moves very little once. Even when driving 100kpj just read 40kpj.

The cause:
1. speedometer cable broke.
The cause could drop out of the water that goes into the cable so of cause rust. The rust that allows the cable broke. Or it could be from the way we took the motor. When we spur roads damaged motorcycle fast, vibration also makes the shock cord and drop out.
2 Gir speedometer worn / cracked.
Speedometer gear worn pineapple can also cause abnormalities speedometer. Make sure the teeth are still shaped pineapple neatly on the plot. If not there is wear to shrink means it's time to change.
3 Drum wheel cracked / broken so no speedometer gear on the stand.
If the curve of the drum until it breaks, pineapple teeth will never play the speedometer cable. This is due to the absence of anchoring teeth pineapple to rotate with the wheel. If pineapple is not spinning gear is definitely speedo needle indicates the number 0 (zero) kph.