Improved Alternator for 860GT

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Mayor08
Cucciolo - the Lil Pup
Posts: 10
Joined: Sun Dec 16, 2012 2:33 pm

Improved Alternator for 860GT

Post by Mayor08 » Tue Aug 19, 2014 6:36 pm

I have an early 1975 860GT and am interested to upgrade the stock 150w alternator to the more powerful 200w alternator. Why? I plan to add the Silent-Hektik electronic ignition and this was suggested to me by an authority on these bikes having restored/serviced these twins for decades. He did make a recommendation for a 200w upgrade but am looking for other options and opinions.

Doing some searching I found a site that recommended for a new components...

Rotor: RO92 - http://www.electrexworld.co.uk/acatalog/RO92.html
Stator: G92 - Generator http://www.electrexworld.co.uk/acatalog/G92.html

Has anyone here had experience with either of these items or any others for upgrading the charging system on the early 860GT?

jockduck
Mariana
Posts: 25
Joined: Sun Jan 17, 2010 3:21 am
Location: South Australia

Re: Improved Alternator for 860GT

Post by jockduck » Sat Aug 23, 2014 5:24 pm

I have no experience in upgrading my early 860GT because I have not had any problems with its charging even when used with the headlight on all the time, I have a rebuilt ducati ignition stator that has been very reliable and the added plus of being self generating. I understand the desire to boost the charging to cope with a new ignition system or you end up like the 750 roundcases, those items you attached look similar to the 200w system, I have a ducati 200w system on my GTS and think its wonderful. You will also have to change the regulator.
Jock

joepagejr
Mariana
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Location: Tacoma, WA, USA
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Re: Improved Alternator for 860GT

Post by joepagejr » Tue Aug 26, 2014 9:16 am

This is what I did to my 860. Basically anything up to 300 watts should fit inside the cover. With the recess in the rotor that flat washer that folds over the flat on the nut was proving to be difficult to install correctly, so I got a metric "shaft nut" with star washer. There is an internal diameter tooth on the washer to fit in the key seat to hold it in place, then with spanner tighten the nut down, and once an external tooth lines up with a slot in the nut fold it down and it's locked in place.

I bought this particular regulator/rectifier: http://www.electrosport.com/street-bike ... ifier.html
The wiring instructions say to directly connect the negative lead to the negative battery terminal, but I had some firing issues out of my Lucas Rita ignition directly after installation, so I just connected the negative lead to the frame and the problem went away.

Hope this helps, mayor08.
Attachments
shaft nut washer.jpg
alternator.jpg
1975 Ducati 860 GT - 850589

Mayor08
Cucciolo - the Lil Pup
Posts: 10
Joined: Sun Dec 16, 2012 2:33 pm

Re: Improved Alternator for 860GT

Post by Mayor08 » Sat Aug 30, 2014 5:59 pm

joepagerjr- good advice with the installation and I was on the electrosport website the other day looking at that regulator/rectifier. I heard back from electrexworld and they said the RO93 & G93 are correct for my bike but their items are rated at a 150w output. They might be better made but I was still looking for a stronger output what did you use for a stator? And is that the stock rotor you're using? How many watts is the bike putting out with this setup?

joepagejr
Mariana
Posts: 27
Joined: Tue Oct 23, 2012 6:26 am
Location: Tacoma, WA, USA
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Re: Improved Alternator for 860GT

Post by joepagejr » Mon Sep 01, 2014 5:10 pm

My brother gave me the stator and rotor and he told me they were from a SS Darmah. The SS Darmah is rated to put out 200 Watts. Both the stator and rotor are wider than the original stock 860 GT parts, which is why I have the different fasteners on the crankshaft to secure it in place. As I mentioned before, you can get up to a 300 watt single phase setup inside the cover of an 860. My brother has a 300 watt setup off a 94 888 on his 860 (he's got a pretty neat ignition setup). Hope this helps.
1975 Ducati 860 GT - 850589

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