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Dyna 2000 upgrade gains, repeated Dyna-S failure (wiring/charging related), C5 igniti

Chuck78

Chuck78

Forum Sage
Past Site Supporter
After searching dozens of old Dyna 2000 & Dyna-S threads, I read Earlfor posting a few years ago saying that once he installed a dyna 2000, he decided immediately he would never go back to anything lesser. What are the biggest advantages to the Dyna 2000 on a 920cc 10:1 GS750 with Serdi radiused cut valve job, 4:1, K&N RC-2222 Dual oval filters, & VM29 smoothbores?

It seems as if you can set up the Dyna-S to get the same total Advance curve at high RPM, but the main advantage I see is that you can back off the advance at lower RPMs when you are running higher compression Pistons, to avoid detonation at lower rpm under heavy throttle, as well as likely having a programmed variable dwell on the 2000 that may let it idle better, vs a fixed dwell on the Dyna-S that is set broad enough for excellent high rpm operation but low rpm and idle is stuck with that high rpm dwell setting, which draws additional voltage and may detract from the idle.


s-l300.jpg



Opinions?
 
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My bike was unfortunately set to br the last of the ones I have been wrenching on for friends& wifey for me to actually install the ignition relay mod on.
Well, I just fried another Dyna-S that was only 4 months old!!!! I attribute it to my findings on the wife's bike. I tested voltage at her coils where the Dyna-S plugs in & had minimal drop with bike off.
I couldn't get it running well however.
I then tested the voltage at the coils with the Dyna-S plugged in to the curcuit. Bingo! The coils don't draw any power once they are charged up with ignition on and bike off, as they are not firing. As soon as the Dyna load was drawn on that circuit, I had nearly a 2 volt drop in power at the coils (I put RTV over the aftermarket coil primary lead screws to avoid shorting especially in rain). It would likely show even more voltage drop vs voltage measured at the battery, if I were to do this comparison test with the bike running.

I am certain this is why we fried 2 or 3 Dyna-S ignitions on her bike and 1 on mine, inherent voltage drop UNDER LOAD through the ign/kill switches, 6 feet of wiring, & many connectors.

Anyhow, I am tired of frying ignitions, and am still skeptical of having the ignition modules located within the pickups at the end of the crankshaft under a cover inside of a hot running air cooled engine, & was really considering a Dyna-2000... I can get a new Dyna S under warranty and 3 or 4 at cost for broken unit exchange prices from Dynatek, but thought I might try the Dyna 2000 WITH an ignition relay mod to power the Dyna and coils.


I am going to speak to Dyna and insist that they add to their "make sure your charging system is perfectly operational and not overcharging or giving low output, before installing this ignition" disclaimer the addition of "test voltage at coils and ignition input locations WITH engine running at idle speed to make sure you do not have substantial parasitic loss due to old wirining, connectors, & switches"
 
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Lastly, although I may not try this at all on any of my 4-cylinder bikes, I am very tempted to try this on my gs425 racer project. Has anyone ran a C5 Optical ignition on their GS or any other machines? It uses an optical pickup on the crankshaft instead of magnetic. It comes with its own ignition coils also. In the Gs twin model, they have two options, standard, which is a wasted spark system, and single fire. Eliminating the wasted spark on a small capacity engine like this it seems as if it would be of decent benefit .

From the C5 ignition website:

GS250 GS300 GS400 GS450 GS500
JS-2502


We have installed in Suzuki twins from 250-500cc (air cooled) with an ignition plate diameter of 3.13 inches.


This kit really wakes up these small twins!
Kit comes with ignition, coil(s), and spark plug leads.


You have the option to purchase Dual or Single Fire kit. 
Dual fire will spark both sparkplugs at top and bottom of the piston stroke and is typically called "wasted spark".
Single fire will spark each cylinder specifically when that piston is on the compression stroke only.

Kawasaki model:
9469825.jpg
 
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