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Old 04-01-2018, 02:23 PM
kritsher kritsher is offline
Join Date: Feb 2007
Location: Stow MA
Posts: 165

I just installed the JD regulator after my original VR started to show signs of failure at 175 hrs. I’m now seeing voltages occasionally hitting 14.6V, which gives me an audible “voltage” warning through the Skyview. I’m sure this is normal, as the JD VR is set to 14.4v, but I’m wondering: have people reset the voltage limits on the Dynon, and if so, what are appropriate new limits?
RV-12 #359
6B6 - Minuteman Field, Stow, MA
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Old 04-02-2018, 08:19 AM
f1rocket's Avatar
f1rocket f1rocket is offline
Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,283

Yes, you have to change the upward limit. I just bumped mine up to get rid of the nuisance warnings. I don't recall exactly, but it was either 14.8 or 15.0. If it "runs away", it will go much higher than that.
Randy Pflanzer
Martinsville, IN (II87)
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Old 04-02-2018, 07:28 PM
Driftdown Driftdown is offline
Join Date: Jan 2011
Location: Clearwater, Florida
Posts: 330

Originally Posted by f1rocket View Post
Yes, you have to change the upward limit. I just bumped mine up to get rid of the nuisance warnings. I don't recall exactly, but it was either 14.8 or 15.0. If it "runs away", it will go much higher than that.
I would like to see Jolly check in on this and provide some guidance.
I have a similar issue.
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Old 04-03-2018, 06:13 AM
Dave12 Dave12 is offline
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,330

I am not taking anything away from Jollyís expertise and experience in the Rotax area, but F-1ís advice works fine. There are many of us using the John Deere regulator ( in my case, a amazon $20 knock off). In my experience the $200 Ducati is no more reliable than the $20 Amazon. The Amazon has a bit higher charge rate. I have always carried a spare Ducati and now I carry a spare John Deere. This practice really saved my bacon a few years ago when my Ducati failed in the mountains of N.C. on start up one Saturday morning. 20 minutes later we were ready to roll with the John Deere.
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Old 04-03-2018, 06:16 AM
BigJohn BigJohn is offline
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,509

I plan to replace my second Ducati with the SK next time it shows signs of weakness. See below email I received very recently from Supplier in UK.

Personally I am willing to pay the price for what seems to be a quality product, in exchange for not getting stranded somewhere with a dead battery.

I have not heard of a single SK failure. Has anyone else?

On a subsequent email Ian offered a 10% discount for an order of four units.

Hi John,

Thanks for making contact, apologies for the slow response.

We can order you in an F4118 with the connector block as per the attached
picture, we would be delighted to ship it to you in the US. We do not keep
these controllers in stock and they take something like 10 days to get to us
from the factory.

The pricing is:

F4118 = £198.00gbp
F4116 connector = £9.50gbp
Shipping = £19.00gbp

We can accept cards no problem, order form attached, if you let us know a
number and a time to call we can take the card payment over the phone if you

Best regards



-----Original Message-----
From: John Peck <>
Sent: 22 March 2018 11:51
Subject: SK Regulators

I understand you sell the SK F4112 and F4118 regulators. What is your price
for these shipped to the USA?

Sent from John Peck's iPad

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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
RV-12 N37JP 120176 Flying since 2012.
VAF paid through 10/2018. Best bargain in town.
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Old 04-03-2018, 06:30 AM
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tomkk tomkk is offline
Join Date: Apr 2014
Location: Port Orange, Fl
Posts: 735

If I have the exchange rate right (.71), that totals about $320 ...
Port Orange, Fl
RV-12 N121TK ELSA #120845; first flight 06/10/2015
RV-12 N918EN ELSA #120995 Eagles Nest Project; ready for engine & avionics
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Old 04-05-2018, 01:28 PM
Jolly Jolly is offline
Join Date: Nov 2016
Location: San Francisco, CA
Posts: 41

Running at 14.2 is good and even up to 14.6. My 1800 Honda Goldwing motorcycle runs at 14.2 - 14.4
14.2 is better than some see that are around 13.2 - 13.6 with these newer AGM and LiPo batteries. So setting a high voltage alarm at 14.8 - 15.0 volts is fine. You just wouldn't want 14.8 plus as your norm. Some instrument fluctuation also accounts for some of this bounce. The shunt wires can be scotcbrited and put a dab of dielectric grease on them can sometimes calm this down a fluctuating ammeter. A weak ground can cause fluctuations or lose wires on the battery.
Dynon says the Rotax is a noisy engine and that's why the ammeter can fluctuate.
The two yellow wires from the back of the engine that provides AC current to the VR may not be pressed in all the way and this may cause voltage swings and fluctuating ammeter readings.
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