Mechanical advancer

[tom203]

Not to stir the pot, but....

I wonder what the "c.d." stands for on this KD device.? Off a 1970 f5 bighorn

edit...pic vanished, and resurfaced in later post.

[J Mac]

Thank you great list.
Boys sure are a passionate group here...that's good!
My main goal for the 1100 G is to hear bang bang bang bang from the four cylinders....

[tom203]

Yes, we like our fun... just take a go at one of those advancers and let us know if it fits...we like happy endings.

[Nessism]

A google search on "capacitor discharge ignition" turns up a lot of hits. One of the key elements seems to be the use of two coils triggered off the crank: a pulse generator coil (for triggering) and an exciter coil (to charge the capacitor in the CDI box). According to information I've found a CDI system of this type can use a separate ignition coil, which receives charge from the exciter coil. GS bikes don't use this type of ignition though, the signal generators only have the trigger coil, not a charge coil.

At any rate, this seems to be a pretty good read for anyone that's interested. I learned something from it. https://en.ppt-online.org/181450

[salty_monk]

Yep enquiring minds would like to know... I have an 82 1100G and pretty sure the advance is in the spark box not a mechanical like my 1000's had. (hehe see what I did there ).

Having said that I'll try to take a look to be sure.

Your other (depending on the cost of a mechanical advance) option is to get the Dyna 2000 that has advance (as well as retard for turbo's, rev limiter & a bunch of other stuff) all in the same box.

I suspect you could also run something like this https://www.diyautotune.com and use the original trigger. I suspect there are other alternatives too.

The GS stock advance curve is pretty simple from any info I've seen posted about it... It's basically two steps.

[Killer2600]

You may continue to join the multitude that think it's a "CDI", but you will still be as wrong as they are.

I'm outta this thread.
.

It's quite sad that people are arguing that because their Suzuki doesn't have CDI, then the Kawasaki guys can't either. Jealous much?

You can continue to think I'm wrong that's alright. I know you don't know how CDI actually works so I don't mind if your lack of understanding challenges my understanding.

It's a shame you're bowing out of the thread on this account. I would show you the capacitor in that schematic but you're not going to be here to see it anyway.

That said, as others have said, this thread is about mechanical advancers on/for Suzuki. Kawasaki and CDI are irrelevant.

[Nessism]

I would show you the capacitor in that schematic but you're not going to be here to see it anyway.

I'm interested in learning so explain to me. As mentioned earlier and as detailed in the link provided, a CDI should have both a pulse generating/trigger coil and an exciter/charge coil, but the GS/KZ ignition systems do not have a exciter/charge coil which charges the capacitor. How can these systems be a CDI type when they don't have this element?

GS ignition.jpg

[Killer2600]

I'm interested in learning so explain to me....How can these systems be a CDI type when they don't have this element?

You're focusing on a very specific design and not the operational principle of CDI itself. CDI can be implemented a number of ways. Regardless of how it's implemented a CDI always has the commonality that a capacitor is used to store a higher than conventional amount of energy and deliver it to the spark plug upon firing. This energy can take the form of a higher voltage (hotter) spark or a multi-strike spark. The capacitor for the H1 schematic in question is circled in red below.

cdih1e.jpg

For more information on CDI, consult wikipedia, your nearest library, or even the world wide web.

[hannibal]

Only oil and tire threads are more entertaining.

[Nessism]

Now that I'm at home I can upload a proper functional diagram of the different types of ignition systems from that link I provided earlier. After reviewing these it's clear that the GS and KZ bikes do not have a CDI system, regardless of an ignition coil being in the system or otherwise. Judge as you will beyond that...

ignition by nessism, on Flickr

[Nessism]

You're focusing on a very specific design and not the operational principle of CDI itself. CDI can be implemented a number of ways. .

You never answered the question.

[Killer2600]

You never answered the question.

You answered it with your own diagram..."Although there are many variations" - like I said you're focusing too specifically.

Is a GS not a motorcycle because it doesn't have a V-Twin single pin crank like a Harley-Davidson? It has two wheels, the usual controls, and everything else like a "motorcycle" but it doesn't have V-Twin propulsion so it must not be a motorcycle?

[phydeauxmutt]

... a CDI always has the commonality that a capacitor is used to store a higher than conventional amount of energy and deliver it to the spark plug upon firing. This energy can take the form of a higher voltage (hotter) spark or a multi-strike spark. The capacitor for the H1 schematic in question is circled in red below.

[ATTACH=CONFIG]58242[/ATTACH]

For more information on CDI, consult wikipedia, your nearest library, or even the world wide web.

Like many others on this forum, I am old enough to remember when CDI hit the market as an aftermarket option.

In your diagram, I see a capacitor on the output of a bridge rectifier. The filtered output feeds the low-voltage side of a coil. It is the output of that coil that is then directed to the spark plugs via a distributor. From that diagram, I can't say whether that is a storage capacitor or a smaller filter capacitor. The input to that bridge rectifier seems to come from a transformer circuit, so there appears to be higher voltage there. That does fit the model of a CDI system, but that is not the system that Suzuki used in the GS.

It should also be noted that the coil that is used in a CDI system is not the same as the coil in the GS. Our coils are high inductance, as they store the magnetic field, then release it when triggered. The coil in a CDI system is low inductance, as it is only used as a transformer to raise the voltage.

Bottom line: There may be other bikes that do use a true CDI system, but none of them has "GS" on the side cover.

[Killer2600]

...In your diagram....That does fit the model of a CDI system, but that is not the system that Suzuki used in the GS.

That is NOT my diagram but one posted earlier of a supposed kawasaki CDI. The earlier post postured that the schematic for a Kawasaki H1 CDI was not a real CDI because of the presence of an ignition coil.

You're right, I'm aware of no 80's era GS that implements a CDI. I've also made no such claim that any Suzuki's have CDI.

What other's can answer for me is why the hang up on CDI? What does it matter if it is or it isn't a CDI? Why does it matter if anyone is mistaken on if it (any given bike) actually has CDI? A spark is a spark in my book. That's ultimately what I seek in an ignition system.

[cowboyup3371]

What other's can answer for me is why the hang up on CDI? What does it matter if it is or it isn't a CDI? Why does it matter if anyone is mistaken on if it (any given bike) actually has CDI? A spark is a spark in my book. That's ultimately what I seek in an ignition system.

For one simple basic reason - accuracy. If you are going to refer to something that doesn't exist why shouldn't you be told it doesn't exist. The original point here was to point out that the Suzuki GS series does not use CDI and therefore the person was incorrectly using the term. It was for educational purposes so they would be able to provide the correct information and receive the correct advice for their issue. Shouldn't I be corrected if I said I had an alternator on my bike when in reality it's called a stator? Both provide the ultimate electrical ability to recharge the battery during use but our bikes don't use alternators.

I'm still lost as to why you chose to make it into the argument with everyone here that tried to point out the difference to you.