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For more on marking an answer as the "Best Answer", please visit our FAQ.Remove the capacitor.
Connect it across a battery for a few seconds.
Now the exciting bit happens!
Short the two capacitor terminals and you should see a spark from the discharge.
If it doesn't spark then it is not holding it's charge. You should bin it and buy a new one.
If it does spark, save it and buy a new motor.
Capacitors can be checked in 2 ways:
-ESR meter (specialist tool)
-multimeter (cheap):
first discharge cap by shorting across it's legs.
Set multimeter to a hi resistance range, connect the cap poles in reverse polarity to the multi meter. You should start with a low resistance, which ought to change quickly to a high one as the cap charges. If it doesn't, it's bad.
Or, instead of testing, to save time and hassle just replace it -they arent expensive.-