Author Topic: Laverda Jota Ownership, second time around. (ramblings)  (Read 210114 times)

Offline Dellortoman

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2535 on: August 14, 2019, 03:30 »
Let's see how wrong I can be, a stator is the copper wire coil that rotates around a magnet...

Seems you can be quite wrong. But your prediction of wrongness was actually right  ;D

A stator doesn't rotate around anything. It just sits there and appears to do nothing, in a sense. The name "stator" comes from the fact that it's static. You're correct that the stator has copper wire windings though. The rotor is the bit that rotates.

The rotor has a bunch of permanent magnets in it, and it spins inside or outside the (static) stator. The rotating magnetic field induces current into the stator's copper windings. But because magnets have north and south poles, the current goes one way, then the other way as the magnets pass. That's alternating current, and the voltage increases with revs. The RR (regulator rectifier) sorts it out into DC at the correct voltage.

« Last Edit: August 14, 2019, 07:03 by Dellortoman »
Location: Tasmania, Approx 4253S 14723E

Offline Laverda SF

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2536 on: August 14, 2019, 03:34 »
Dellortoman: Russian Igor solutions work sometimes ;o)

Doesn't mean in the future you have to dissemble the Generator/Alternator, clean, Lube, replace the brushes and polish the commutator contacts on the stator rather then paying for a new charging unit and regulator.

Just remember to use a pin to lift the brushes off the commutator when dissembling and reassembling.

FUCK - I had to pay $900 for a thrashed starter over suck wiring on my 750 SF0 back in 73 - Imported from the Breganzie Factory. I paid $1,600 CDN for my New SFO back then. Don't think I don't take Charging Circuits seriously.

Off course I had to clean that generator 2 or 3 times in 45 years and replaced the regulator once.

Dried out rotting gaskets are the biggest threat for a Breganzie when you don't use her.
« Last Edit: August 14, 2019, 04:24 by Laverda SF »

Offline Dellortoman

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2537 on: August 14, 2019, 04:34 »
Permanent magnet alternators don't have commutators or brushes.
Location: Tasmania, Approx 4253S 14723E

Offline Laverda SF

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2538 on: August 14, 2019, 04:41 »
Really  - I'm an old Foggy and you're on your own ;o)

If you can't fix it - What's a new one cost ?

Could be a simple as a burnt out Mosfet or Diode on a Circuit Board. Perhaps in the Internal Regulator Rectifier Circuit.

Can't imagine the Breganzie Factory using this Tech.
« Last Edit: August 14, 2019, 04:58 by Laverda SF »

Offline Dellortoman

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2539 on: August 14, 2019, 07:20 »
Can't imagine the Breganzie Factory using this Tech.

They used exactly that tech on the triples. They had 2-phase alternators and rectifiers, but no voltage regulator. Alternator output was selected so that voltage regulation was not needed. It was just (barely) enough to run the bike and keep the battery charged. Details varied slightly between HKZ and BTZ ignition models, but basically they used one phase coil of the alternator to run the ignition, with the second phase coil switching on with the lights. Any surplus went to charge the battery. Voltage was held reasonably stable by having a massive battery.

Many owners have installed upgraded alternators since the bikes left the factory, with smaller and lighter AGM or lithium batteries, so voltage regulation has become necessary. That's why you see regulator rectifiers on many Laverda triples nowadays.
Location: Tasmania, Approx 4253S 14723E

Offline cbertozz

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2540 on: August 16, 2019, 22:16 »
Well Red has come to the rescue with a new stator, whatever it may be  :laugh:

In other news this is my "crate" to get the bike back to the East after the Nationals. I am looking forward to riding it again.

1978 Laverda Jota #6041
First owned in 1991, reacquired 2016.

Offline Piranha Brother 2

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2541 on: August 17, 2019, 04:29 »
Going with a transport company, Carlo? How do you get it to them? Logistics of moto transportation. And what's the beefy, black alloy frame to the right?
What ... leave it standard??!!

Offline cbertozz

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2542 on: August 17, 2019, 09:51 »
Going with a transport company, Carlo? How do you get it to them? Logistics of moto transportation. And what's the beefy, black alloy frame to the right?

It's coming back in the QLD classic racing mob, they have a container organised. No container coming back to NSW. I'm in NSW so haven't seen it in person, a friend is handling it for me.
1978 Laverda Jota #6041
First owned in 1991, reacquired 2016.

Offline cbertozz

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2543 on: August 18, 2019, 10:22 »
Fun run up to Blue Mountains.



More pics here:
https://photos.app.goo.gl/7kSNfsSdEfHV8kJV9
1978 Laverda Jota #6041
First owned in 1991, reacquired 2016.

Offline Tippie

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2544 on: August 18, 2019, 12:10 »
That's great. Not many clubs get so many Lavs together for a Sunday run.
SF2 17483 (race)
SF2 17424 (road)
An Australian living near Oslo in Norway

Offline Vince

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2545 on: August 18, 2019, 12:19 »
Not that long ago there were 3 regulars that would turn up. It's great to see it getting bigger.

Offline cbertozz

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2546 on: August 18, 2019, 12:30 »
I need to sneak back and practice so I can keep up with Marty and Chris!
1978 Laverda Jota #6041
First owned in 1991, reacquired 2016.

Offline cbertozz

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Re: Laverda Jota Ownership, second time around. (ramblings)
« Reply #2547 on: August 18, 2019, 22:00 »
That's great. Not many clubs get so many Lavs together for a Sunday run.

It was great to see so many shiny Laverdas, come to think of it I've never seen more than three in any one place at the same time.
1978 Laverda Jota #6041
First owned in 1991, reacquired 2016.