Dyna DRL-300 RPM Limiter not working.

How is the ground connected? In order to limit, the unit must be grounding the coil negatives. A bad ground would prevent the limiter from limiting.

BTW, do you know if the limiter works by killing spark entirely, or by delaying spark?

Have you tried setting the switches to "1". That would be the greatest limiting.

Also, they say the 4 coil wires are functionally the same, but they cannot be connected internally without some circuitry otherwise the coils would not be isolated from each other. Have you tried the yellow or violet wires?

I will call Dyna on Monday and see if they have an explanation. The instructions are a bit too simplistic.

It's the 4th of Juuuulye holliday. Thats why no one is picking up the phone!


I was wondering what all of the noise was about last night. :laugh:

Well, I got hold of Dyna today and they couldn't explain it either. I am sending the unit back for Warranty. I wonder If they can test it and find out what went wrong. The people at Dyna are extremely accommodating and very easy to deal with.

Got my DRL-300 back from Dyna today. Along with it, they sent a "factory Ignition Adapter" that has to be installed between the device and the DRL-300. So I decided to call them and ask them about it. I was told that the OE ignitions on Kawasaki and Suzuki do not have enough voltage at the coils and require a "Voltage Booster" I did not cut the thing apart to see what it actually is, but it looks like a pair if diodes by the shape and dimensions. The weird part is that the guy told me that it makes no difference which way it mounts. I think that they are giving me a load of crock. This thing is sold to be used with OE Inductive ignitions.

No I don't use it.
But looking at the supplied diagram; is your switched 12v supply fed into the rev limiter feed off of the coil + terminal? If so when the bike is running how close to 12v or Charging voltage is it? Is it possible they use a voltage limiting Zener Diode in the voltage feed circuit to protect the inner electrics? Maybe if your incoming voltage is low the box fail safes to off? Just a guess.
Post up a pic of the extra adapter they sent along as a "FIX"

As I said many times before, the Dyna tech-line is full of something, but it is not technical.

If it's diodes, it's probably a pulse-summer. It combines the pulses from both coils to get the right number of pulses for detecting RPMs. The clue is if it is designed to connect to both coils and then goes to the limiter.

It's not really a voltage booster, it may just be a duty cycle booster (which would have the side effect of having a higher average voltage, but this higher voltage is not important).

I have a couple designs for those floating around here on KZR, but the ones I designed are for using car tachometers on bikes.

It seems unlikely the limiter would need the adapter since the limiter is designed to be used on bikes with two coils.

Try it, I guess. But I think the same thing can be done by playing with the switches.

Well, I hooked it up and it worked

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Kind of. What ever setting i put it on (6k being the lowest possible, and 9.5K being the highest I tried) Here is what happened. Up to 50% of setting I had a intermittent misfire. At 50% I had a bad misfire/stutter. after 50% she smoothed out and than starting regulating at setting. I attempted settings at 1K increments from 6K-9.5K and it happened that way every time. It also seamed like I lost quite a bit of power threw the entire range of R's. Once I removed it the bike ran strong again and ran fine. It may be because I am running a .060" gap, but I am not willing to re-gap the plugs to find out. I don't want to re-gap the plugs because i get better millage with the bigger gap. I guess i just wont run a limiter. I'll just have to pay closer attention to the tach. I sent it back again and I wonder what they are going to say this time. I am quite sure that it will work perfectly with points or a .030" gap, but I don't want to run either of those. I just think it's just my particular ignition setup.

Hay Lou, I'm sorry to hear about the water in your basement the other day. I know the feeling. When i lived in Berwyn I had watter a few times a year. I had water a couple of times here in Burr Ridge in the last 11 years also when the power was out for an extended amount of time and the pump did not run. The storms we had on Friday and Saturday morning were pretty bad. I got caught on my bike Friday. I did not have my Brain Bucket on that day and the rain stung like hell, on my face even at 10MPH. I think there might have been ice mixed in with it. There were cars pulled over to the shoulder all over the place because they couldn't see. I was caught in it for only about a mile, but I was completely soaked and my boots were full to the top with water by the time I got home.

I wonder if that limiter was just bad. The wider gap does put more peak voltage on any device hooked up to the primary, but it should be able to handle it if the coils and ignitor can handle it.

Yeah, that rain was crazy. The Des Plaines, by my dad in Riverside, came up 7 ft in 12 hours. That's where I spent most of the day. Just starting on my basement now.