Topic: Dynatek install and popping sound

[Sething]

Why do you use the kill switch anyway? That is only meant to be able to switch the engine off in an emergency without taking your hand off the handlebar, and it'll wear a lot faster than the keyed ignitionswitch!

This is true, I could bypass it altogether. I guess there was a nostalgic part of me that wanted to use it. It was also a fun challenge to figure out how to make the old OEM switch work with the new.
This still doesn’t answer the question though about why the flow of electricity is going all the way to the spark plugs...
I think it might do this even if I bypass the switch.


Honda 1977 CB750K

[Sething]

Didn’t even consider that. Even more important given I have a keyless ignition with the m lock.


Honda 1977 CB750K

[TwoTired]

This still doesn’t answer the question though about why the flow of electricity is going all the way to the spark plugs...
I think it might do this even if I bypass the switch.


Honda 1977 CB750K

I thought I answered this question in reply #19.

The Dyna S powers up in on mode, providing power to and charging the coils.  A coil will spark with a rapid increase in power applied or with power removed.  That's the nature of coils, essentially a transformer, stepping up the applied power.  The secondary twitches with power applied or power dumped.  Usually the dump (timed trigger) is faster than the rise of power applied.  But, with 3 ohm coils, the input current is far more spikey at turn on.  Sudden voltage at the spark tips creates an arc.  It could also do this upon power turn off.

Cheers,

[seanbarney41]

This still doesn’t answer the question though about why the flow of electricity is going all the way to the spark plugs...
I think it might do this even if I bypass the switch.


Honda 1977 CB750K

I thought I answered this question in reply #19.

The Dyna S powers up in on mode, providing power to and charging the coils.  A coil will spark with a rapid increase in power applied or with power removed.  That's the nature of coils, essentially a transformer, stepping up the applied power.  The secondary twitches with power applied or power dumped.  Usually the dump (timed trigger) is faster than the rise of power applied.  But, with 3 ohm coils, the input current is far more spikey at turn on.  Sudden voltage at the spark tips creates an arc.  It could also do this upon power turn off.

Cheers,

yup...my kz650 with Dyna ignition and Accel 3 ohm coils will do this every now and then, I think it just depends on where the engine just happened to stop last time it was turned off...so say the intake valve is open on 1 or 4 and the rotor just happens to be ready to fire 1 and 4, turn the key on and pffft! what the hell was that!  I may have the exact details wrong here but hopefully you get the idea.

[Sething]

This still doesn’t answer the question though about why the flow of electricity is going all the way to the spark plugs...
I think it might do this even if I bypass the switch.


Honda 1977 CB750K

I thought I answered this question in reply #19.

The Dyna S powers up in on mode, providing power to and charging the coils.  A coil will spark with a rapid increase in power applied or with power removed.  That's the nature of coils, essentially a transformer, stepping up the applied power.  The secondary twitches with power applied or power dumped.  Usually the dump (timed trigger) is faster than the rise of power applied.  But, with 3 ohm coils, the input current is far more spikey at turn on.  Sudden voltage at the spark tips creates an arc.  It could also do this upon power turn off.

Cheers,

yup...my kz650 with Dyna ignition and Accel 3 ohm coils will do this every now and then, I think it just depends on where the engine just happened to stop last time it was turned off...so say the intake valve is open on 1 or 4 and the rotor just happens to be ready to fire 1 and 4, turn the key on and pffft! what the hell was that!  I may have the exact details wrong here but hopefully you get the idea.

Thank you Seanbarney41 and Twotired. I was just talking to someone about how I must have had the carburetor valve open and residual gas in the cylinder in just the right position with the Dyna firing on that cylinder. Perfect storm. I’ll stop asking now.



Honda 1977 CB750K

[Hodmi]

I’m not sure if you are already beyond this point, but I installed a dyna kit on my 78 750F a while ago and the red wire was a bit of a mystery to me too.  I eventually tied it into the main tail light “hot” wire.