Dyna Ignition
Posted: Thu Dec 07, 2023 12:00 pm
Going through this 1981 CBX, I found that it had a bad coil, no spark.
The way I check for spark is the way I learned back in shop class on trouble shooting car motors.
Pull the plug wire off, stick a screw driver in the plug wire and turn it over, if there is spark you will know it.
I looked at replacing the stock coils util I ram across the Dyna Ignition,
I liked the sound of the high voltage coils, so I decided to go that route instead of just replacing the stock coils.
On the stock coils, both sides of the coils are hot, when the reluctor passes the contact for a coil group, it grounds out causing the coil to fire.
On the Dyna ignition, only the top of the coils are hot, when the reluctor with a magnet this time passes the contact for a coil group, it fires hot this time at the coil causing it to fire.
Both work, you can replace the stock coils with the dyna only coils and the bike should run, if the coils were the only problem, without going to the Dyna ignition, getting the higher voltage to the plugs.
To time the bike, I used a test light, after pulling all the plugs, turning the engine over by hand until the reluctor fired at the coil, that is where I tightened up the ignition back plate.
The timing did work as the bike fired right up after setting everything up.
When I get the CBX off the lift, I have the CB750 Limited that I need to do the same thing to, the 750 has weak spark and it does not idle well running on 2 cylinders.
The way I check for spark is the way I learned back in shop class on trouble shooting car motors.
Pull the plug wire off, stick a screw driver in the plug wire and turn it over, if there is spark you will know it.
I looked at replacing the stock coils util I ram across the Dyna Ignition,
I liked the sound of the high voltage coils, so I decided to go that route instead of just replacing the stock coils.
On the stock coils, both sides of the coils are hot, when the reluctor passes the contact for a coil group, it grounds out causing the coil to fire.
On the Dyna ignition, only the top of the coils are hot, when the reluctor with a magnet this time passes the contact for a coil group, it fires hot this time at the coil causing it to fire.
Both work, you can replace the stock coils with the dyna only coils and the bike should run, if the coils were the only problem, without going to the Dyna ignition, getting the higher voltage to the plugs.
To time the bike, I used a test light, after pulling all the plugs, turning the engine over by hand until the reluctor fired at the coil, that is where I tightened up the ignition back plate.
The timing did work as the bike fired right up after setting everything up.
When I get the CBX off the lift, I have the CB750 Limited that I need to do the same thing to, the 750 has weak spark and it does not idle well running on 2 cylinders.