According to the manual it is .6-.7mm which is .023 - .027 inches.
Spark plug types are as follows:
NGKC7HSA Champion Z9Y
NGKC6HSA
NGKC8HSA
Sparkplug sounds like is too long . Check to see if its the right plug.
The spark plug gap on a 49.5 CC scooter will be set at 0.24 inches. Spark plugs may be purchased at an auto parts store.
Have you checked for spark? Have you changed Spark Plug?
The Honda FES 125 Pantheon is a motor scooter, developed by Honda.If you want to find a spark plug for one you should go to a motorcycle parts store and see if the plug cap for that model is available.
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Check to make sure you dot have any kinks in you fuel line or your vacum line. If not check your fuel filter to make sure it is completely clean and if not replace it. finally check your spark plug to see if fouled or wet. Do this by unscrewing the spark plug and plug the spark plug back into the spark plug wire. Place it about 1/4" from anything close that is metal and try to start the motor to see if it sparks. If the spark is good your plug is not fouled. It is most likely not enough fuel or spark getting to the motor especially if there is no white smoke or colored smoke (burning oil) coming out the exaust.
According to my owners manuel the spark plug gap is 30
1-1.1mm (right out of the manual)
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
The way you unflood a scooter enging is really the same as most engines. First you remove the spark plug. Second, If the spark plug dose hase gas on ether burn it off or find a way to remove the gas for the spak plug cilender.
You have a problem with your carburater.