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Discussion starter · #141 ·
Ah...got it. My bike came with Flatslides on it, so the original carbs and that box was discarded many years ago. I had Flatslides on my first two Super Sports....best upgrade ever.

-tj



This is the triangle box that the vacuum lines go into.

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Discussion starter · #143 ·
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Discussion starter · #144 ·
Today, almost three months from the day I began disassembling my Super Sport, she is back on the ground and almost ready for a test ride. She started almost immediately, with no drama, so my partial engine disassembly and reassembly went well. I still have some minor tasks to complete, bleed hydraulics, lube chain, nut and bolt her, and check for leaks, but she should be roadworthy in the next week or so.

Thank you to all who helped me with information and advice on this build. This forum has been invaluable and without your help I would have had a much harder time.

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-tj in the Cruz Mtns
 
Discussion starter · #147 ·
It has been a couple of weeks since I finished the restoration of my 92 900 SS and I'm sad to say that I have yet to ride her. The Bay Area, and the Santa Cruz Mountains have received a lot of rain over the past couple of months and it's only been in the last week that we've had relatively dry weather. Unfortunately our property, and specifically, the driveway, are not in good shape, even for cars, much less a Ducati Super Sport on brand new unscrubbed tires. I've been waiting for the mud, rocks, leaves and branches to dry out so that I can clear the steep and nearly 100 yard long driveway so that I can test ride my reborn motorcycle. Hopefully the dry weather on the way will help and I'll be posting a ride report soon thereafter.

In the mean time, I have a question for those of you running Keihin Flatslide carburetors. I cannot recall how the throttle cables were routed prior to disassembly but I know that even then I was not happy with the way they were binding against the fork tubes and/or instrument cluster.

Here are a couple photos of how mine are routed. Is this the way yours are? If not, do you have any suggestions? I tried routing the cables outside the left fork leg (rather than inside) but they're too short for the ends to reach the throttle, so it seems that this is the only way, unless I'm missing something.

-tj in the Cruz Mtns

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Discussion starter · #149 ·
Thanks...it seems the only option. I had considered using a loose zip tie to try to do exactly as you say.

-tj

looks right to me.

It always is a battle to keep them from fouling the gauge cluster foam , some times I create a wire loop or bale to guide them better.
 
Discussion starter · #150 ·
6 weeks after completing the restoration of my Super Sport I finally got to ride her, albeit for a very short amount of time. A couple miles in I pulled over for a safety check and noticed that the steering head bearings were a little loose. I headed back home, fixed the problem, and headed back out. Before I got to the gate, but at the bottom of a rather steep driveway, she died. No life at all.

Without my wife's help, I would not have been able to push it back up the driveway. Even with her help it was a helluva struggle.

I have an Optima Lithium Ion battery and the Optima Battery charger. I put the battery on charge and it seemed the battery had been nearly completely dead. I had charged it fully prior to the ride and had it in maintenance mode on the charger.

I thought that I had tested to see if the charging system was working after the build, but I am not 100% certain.

This morning I started it up, put the voltmeter on the battery and old saw 12.2v. It seems that my charging system is not working. I will consult the manual but in the meantime does anyone have any guidance on a quick way to check the charging system? It's most likely that I missed a connection or a ground or something.

-tj in the Cruz Mtns
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Discussion starter · #151 ·
Looking at the Workshop Manual it says that the body of the voltage regulator must be connected to the negative post on the battery. I assume this is the same as "the body of the voltage regulator must be grounded, as is the battery, because I do not recall a cable going from the voltage regulator all the way to the battery negative.

-tj in the Cruz Mtns
 
… anyone have any guidance on a quick way to check the charging system? It's most likely that I missed a connection or a ground or something.

@belter has a good write up here:

 
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Looking at the Workshop Manual it says that the body of the voltage regulator must be connected to the negative post on the battery. I assume this is the same as "the body of the voltage regulator must be grounded, as is the battery, because I do not recall a cable going from the voltage regulator all the way to the battery negative.

-tj in the Cruz Mtns
It is most likely your voltage regulator, especially if you still have the original. I replaced mine with a MOSFET from Duc or Die. I chose this one because it is plug and play and because it looks identical to the original. BTW, you are right, the regulator should be grounded. There should be a small ground wire coming out from the wiring harness.

 
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I ran the ground from the regulator all the way to the battery, didn't trust the original wiring loom. MOSFET for the win over 30 year old shellac electronics. The Lithium Ion battery needs a stable power supply, precise delivery of exact voltage or it won't co-operate. Your reg/rect might be just fine with the original type battery.
 
I ran the ground from the regulator all the way to the battery, didn't trust the original wiring loom. MOSFET for the win over 30 year old shellac electronics. The Lithium Ion battery needs a stable power supply, precise delivery of exact voltage or it won't co-operate. Your reg/rect might be just fine with the original type battery.
Especially with a really advanced BMS that it appears the Optimates have. With an unstable input it may well not charge the battery at all.
 
Discussion starter · #156 ·
I’ve been wanting to go with a modern regulator on my 916 but since I never ride it have not gotten to that job.

With regard to the Super Sport, it was fine before I disassembled it, so I’m assuming I screwed up a wire.

I didn’t see an output rating for the generator/alternator on the Super Sport. I connected a wire from the body of the regulator to the negative side of the battery and saw 13v on the multi-meter, but then when I disconnected the wire from the battery it still read 13v.

Does anyone have an anecdotal data regarding what kind of voltage I should see at the battery with the engine running?


-tj
 
I’ve been wanting to go with a modern regulator on my 916 but since I never ride it have not gotten to that job.

With regard to the Super Sport, it was fine before I disassembled it, so I’m assuming I screwed up a wire.

I didn’t see an output rating for the generator/alternator on the Super Sport. I connected a wire from the body of the regulator to the negative side of the battery and saw 13v on the multi-meter, but then when I disconnected the wire from the battery it still read 13v.

Does anyone have an anecdotal data regarding what kind of voltage I should see at the battery with the engine running?


-tj
You should see above 13v at idle and somewhere around 13.8 at 3k rpm.
 
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Discussion starter · #158 ·
Discussion starter · #159 ·
Interesting. Thank you for this information.

-tj

I ran the ground from the regulator all the way to the battery, didn't trust the original wiring loom. MOSFET for the win over 30 year old shellac electronics. The Lithium Ion battery needs a stable power supply, precise delivery of exact voltage or it won't co-operate. Your reg/rect might be just fine with the original type battery.
 
Discussion starter · #160 ·
So I think that I figured out the reason the battery wasn't getting charged...I connected the ground parts of the wiring harness incorrectly and the ground from the regulator to the battery negative was not connected.

Now the regulator appears to be putting out <battery voltage but only around 13.3v. Should be enough to charge but a little more would be nice.

Has anyone bought the MOSFET regulator that Roadster Cycle sells? He's in Los Angeles and I've talked to him about a regulator for my 916. It's a lot more convenient than ordering one from Europe.

-tj
 
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