Weegie Posted May 8, 2020 Share Posted May 8, 2020 Just wondered if anybody put anything different onto their bikes in place of the stock BAE 850 coils. I'm relocating the coils from their original position up at the front of the bike in an attempt to install a larger oil cooler on a Magni Australia (Hi Cam engine identical to the Daytona RS and Centauro). The only suitable place I can find is at the rear of the bike above where the rear shock is. They are going to be a bit of pain to fit due to their shape and one has a broken shroud on the LV plug, so I thought about replacing them They work well enough but measuring primary resistance I got 0.6 Ohms which is very low. John Link to comment Share on other sites More sharing options...
swooshdave Posted May 9, 2020 Share Posted May 9, 2020 Do you know all the specs on them? Link to comment Share on other sites More sharing options...
Weegie Posted May 9, 2020 Author Share Posted May 9, 2020 No Dave I tried searching and couldn't find any spec sheets, all I can measure would be the Primary and secondary coils, but they seem a bit of a mystery It's not a biggie it was just a thought that perhaps somebody had replaced a set with Dynas or the like John Link to comment Share on other sites More sharing options...
docc Posted May 9, 2020 Share Posted May 9, 2020 Why is 0.6 Ohms "very low?" What would expect to see? Link to comment Share on other sites More sharing options...
Weegie Posted May 9, 2020 Author Share Posted May 9, 2020 Primary for normal coils that I'm used to on Tontis and the like are usually a lot higher 5 Ohms, Guzzis don't need really fast saturation time AFAIK. There is still the perrenial threads about Dynas burning out with 3.0 Ohm coils on the older bikes However perhaps these coils are a different design but with no information I haven't a clue. Seems though a lot of modern coils seem to have lower primaries. 1 Link to comment Share on other sites More sharing options...
Weegie Posted May 14, 2020 Author Share Posted May 14, 2020 Closing this out as it's not going anywhere I got a spare set of BAE 850s off a Ducati from the Bay of Fleas, cost me as much to ship over the pond as the price of the coils, but at least I've got a couple of spares Should you need them, don't limit your search to Guzzis, Ducati used them and probably some of the other Italian suspects to Link to comment Share on other sites More sharing options...
docc Posted May 14, 2020 Share Posted May 14, 2020 How about posting the resistance of the primaries for comparison when they show up! Link to comment Share on other sites More sharing options...
gstallons Posted May 15, 2020 Share Posted May 15, 2020 The resistance of the primary and the secondary of both coils , please Link to comment Share on other sites More sharing options...
Weegie Posted May 15, 2020 Author Share Posted May 15, 2020 I'll wait until the replacements arrive and when they do I'll measure all 4 primary and secondary then post them up 1 Link to comment Share on other sites More sharing options...
gstallons Posted May 15, 2020 Share Posted May 15, 2020 Good , just something good to know Link to comment Share on other sites More sharing options...
Weegie Posted May 15, 2020 Author Share Posted May 15, 2020 OEM Primary 0.6, 0.63 Ohm Secondary 3.172, 3.188 K Ohm Post the Ducati pair here when they arrive Link to comment Share on other sites More sharing options...
docc Posted May 15, 2020 Share Posted May 15, 2020 2 hours ago, Weegie said: OEM Primary 0.6, 0.63 Ohm Secondary 3.172, 3.188 K Ohm Post the Ducati pair here when they arrive Pretty much the same as your existing coils, then? Link to comment Share on other sites More sharing options...
Weegie Posted May 15, 2020 Author Share Posted May 15, 2020 Hi docc No these are the originals that I tested and posted up. The Ducati coils have yet to arrive. Not holding my breath judging by the state of both US and UK postal services Hoping the Ducati coils will be identical they are the same Marelli BAE 850AK as used by Guzzi 1 Link to comment Share on other sites More sharing options...
Weegie Posted May 26, 2020 Author Share Posted May 26, 2020 Closing this out with the requested info as the Ducati coils arrived today, all four of the coils tested are Marelli BAE 850 AK OEM (coils that are in the bike) Primary 0.60, 0.63 Ohm Secondary 3.172, 3.188 k Ohm Ducati Coils Primary 0.60, 0.59 Ohms Secondary 3.195, 3.168 k Ohm 2 1 Link to comment Share on other sites More sharing options...
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