I have an old kawasaki 125 it has the dual sparkplugs but only one cylinder..Ok so heres the problem...The wire from the flywheel is hot, the spark plug lead from the ignition coil is hot. I just cant get the plug to spark. Any ideas?

Welshman-78 said:

you can test the coil with a 12 volt batt on the bike to see if it is good.

how does that work..you just hook the battery up to the coil? could you explain please?

The signal wire sends 12 volts to the coil in rapid ON to OFF fashion. If you test it with a battery, connect it and disconnect as fast as possible. As fast as a snap of the fingers. Make sure your plug is grounded to the same battery. You should spark. If no spark, check the lead to the plug. If not properly insulated and connected to boots and whatnot, it will not fire. If the wire lead is good visually, then it's probably the coil itself. Your signal wire should be intermittent as the engine turns. -BIG DAN:thumbsup:

On another note. Two spark plugs promotes better, or more complete combustion. In a single set up the flame front has to run all the way across the piston head which makes a nice smooth push on the piston. This is great for idle and low rpm, but at 7-9 thousand revs that flame can begin to lag and combustion is wasted out the quickly opening valves. This can cause after firing and back firing. Two plugs (if fired at the same time), has two flame fronts meeting in the middle of the piston causing a nice clean combustion and a harder push.
The idea is to push spent gasses out your pipe, not flames.