honda cg125 (2007) electric starter only.
refuses to start. began slowly, occassionally not starting but being able to bump it. have cleaned starter motor and replaced battery.
any idea?
thanks.

james c, February 2011

unscrew the spark plug, click the spark plug into the plug cap so it is dangling on the wire, use INSULATED pliers to hold the plug lead, thats the wire NOT THE PLUG, hold it so the end of the plug is about 5mm from the engine casing, press the starter button, you want a bright blue spark to jump between the plug and the engine, if its yellow or not sparking, you need to look further into a spark problem, if its blue you need to look at fuelling

vicki_the_stig, February 2011

i would suggest checking the valve clearances too and if still no luck then check the compresseion mate these do suffer from burning vales so have a look and also its the sort of problem thaat gets progressively worse.these are very easy to work on and as they are a pushrod engine the head can be easily taken off and put back on witout messing with the valve timing

adam bike doctor(of milton keynes motorcycle centre), February 2011

change the fuel filter if it has a inline one and change the spark plug

GHOST, February 2011