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Author Topic: Ugly Goose - Moto Guzzi 850T cafe  (Read 54733 times)

Offline Rusnak_322

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #200 on: Oct 04, 2016, 17:01:57 »
I guess when the "on switch" is on, the two yellows go into the reg/req and out the "I." and then to the starter terminal that the positive battery cable is attached to.

it that correct?

I still have a lot to learn when it comes to electrical.

Offline Sonreir

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #201 on: Oct 04, 2016, 17:50:05 »
I'd open up the alternator cover and take a look at things. I think you should have three yellows.
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Offline Rusnak_322

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #202 on: Oct 05, 2016, 15:40:36 »
here is the insides -

only 3 wires coming out. I felt the harness and there are no more cut short and hiding in there.























Offline Sonreir

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #203 on: Oct 05, 2016, 16:28:19 »
How about under the cover?

It should look something like this?
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

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1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

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Offline Rusnak_322

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #204 on: Oct 05, 2016, 17:00:15 »
Looks like the Saprisa alternator is correct. 2 yellow and a red direct to the battery. 

http://www.thisoldtractor.com/guzzi007/schematics/1988_1000_SP.gif

Offline Sonreir

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #205 on: Oct 05, 2016, 17:02:04 »
Interesting. I didn't know about too many bikes that use generators.

Sounds like you maybe just need a new regulator then?
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

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1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline Bevelheadmhr

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #206 on: Oct 05, 2016, 22:45:49 »
You have the same confusing setup as my Guzzi, same Rectifier/alternator, the two yellows go to the rectifier and the red goes directly to the battery. Which isn't what I'm used to seeing on other bikes I've worked on. I asked for advice about this, and got the following answer..

''The control device can be anywhere in the circuit, here it's between chassis and each yellow wire connected to a rectifier inside the regulator. When the yellow wire goes Negative the rectifier clamps it to the chassis which forces the center tap (red wire) to go Positive and push current to the battery.

Half a cycle later when the other yellow wire goes Negative, it's rectifier again forces the center tap to charge the battery.
This idea was very common in old tube radios.

In this arrangement each coil only works half the time

In this case the rectifiers are not just common diodes they will be Silicon Controlled Rectifiers that can be turned off when the battery is up to Voltage effectively breaking the circuit''.

Which is a bit over my head lol... but I take from this that rather than the current from the alternator, being rectified by the rectifier before it continues on to charge the battery, instead in the Guzzi set up, the rectifier (via the two yellow wires) control the current in the alternator causing it to be rectified at the source (ie the alternator) so the current can go directly to the battery vi the red wire.

Also note that the ground wire to the regulator is very important, ground it to a bolt or screw on the engine.

Offline brad black

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #207 on: Oct 08, 2016, 08:23:35 »
if it's got a saprisa can you piss that off and fit a ducati alt and reg from a later model, even a small block 750 breva or nevada.  never seen one like this fitted to an oldie.

Offline Rusnak_322

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #208 on: Oct 15, 2016, 22:23:02 »
OK I got it sorted.mi didn't have a hot 12v to the rectifier. Put that in place and all is good.

Went on a 45 mile ride today with zero issues. The only thing I need to do is tweak the shifter so that the throws are not so long. I got a few false neutrals because of that.

I also have a tiny tank! I was almost empty and put 1.2 gals in to fill it.

I went out just before dusk and took some pics.






























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Offline Perter

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Re: Ugly Goose - Moto Guzzi 850T cafe
« Reply #209 on: Oct 16, 2016, 05:57:49 »
Good to hear you sorted it out.

Nice pictures in the sunset. And even the closeups are nice, a lot of bikes are best "from some distance" if you know what I mean.

False neutrals is a known issue on 5speed guzzis especially between 2 and 3. I get used to keep pressure on the shifter pedal while I release the clutch, then it stays in gear.

Do you only have 1.2 gallon in the gastank? Mine goes around 15km/ltr which equals something like 33miles per gallon so Im happy with the 20 ltr standard tank.

It looks like you run separate fuel lines to each carb? Standard is to run through a "crossover" where thr two sides meet, it may help you to get the last drops out of your tank