MOSFET regulator rectifier

Paul LeClair

Paul LeClair

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Staff member
Location
Calgary, Alberta, Canada
Hi all

I need a new regulator rectifier to replace the broken original on the 82 1200 TS Mirage Series 2. I am also thinking "while I am at it" I might as well replace the stator.

as I am "electrickery challenged" I did some web searching, dimly realized there are different ways to regulate alternator output after it is rectified, and that apparently a MOSFET equipped regulator is better.

Found a great thread here that explains everything in plain enough English that it made sense to me. Like anything on the internet I am not sure if it is a thousand percent accurate, but it makes sense to me

http://www.superhawkforum.com/forums/knowledge-base-40/mosfet-regulator-rectifiers-why-how-25117/

for my 82 1200 I want three phase rectification, so to connect one wire each to each of the three output wires from the stator, and a MOSFET equipped regulator.

that is where my question arises. What is available to buy for our Laverda's that will fit the bill? I don't care about wiring plugs, I will just cut the plug off and wire direct, I also don't care about a charging warning light. So I just need three wires for the stator, a power out to the battery, and a ground.

I would rather buy new. Electrex/Electrosport don't seem to be using MOSFET technology as far as I can see, or if they are I missed it.

Ricks Motor Sport Electrics appears to offer SOME of their rr's with MOSFET technolgogy but I have not figured out which one to order to suit my intended use on the Laverda    http://ricksmotorsportelectrics.com/rectifier-regulators    Anyone?

Also, if I replace the stator what is the equivalent, I heard the Laverda factory just used Suzuki stuff, what year/model Suzuki stator would fit? Alternatively, what would the best stator available be for the 82 1200?

Paul LeClair
 
Ah Mosfet !!!! (No, not Israeli intelligence agents).
This has been discussed by sparky type people before.

Read and enjoy:
http://www.laverdaforum.com/forum/index.php/topic,93081.0.html
 
thanks, Simon, somehow I missed that previous thread.....

Reggie, yes, winter is nearly here, I am still fiddling with Laverda's that I can test ride as I fettle, I have been putting off moving the 79 Honda CBX Turbo project onto the lift until the riding is definitely done........

so, am going to order a brand new Shindengen FH 020AA Mosfet three phase, with connector kit, for $129.95 USD.

Now, what about a new stator for an 82 Laverda 1200 Series 2 or an RGS? What model/year Suzuki (?) stator would be a good replacement, or what is the best aftermarket stator replacement, three phase, most output?

Paul LeClair
 
while I went ahead and ordered a new regulator rectifier and am waiting for it to arrive, I have not yet ordered a new stator.

the charging symptoms I am addressing is that there was no charging, only battery voltage. The extent of my testing was to put a voltmeter across the battery with the bike running, rev the engine up, and observe there was no voltage increase. This was after the brand new battery would not re start the bike after a lengthy ride. The battery itself checks fine, and recharged fine on a battery charger.

now I have the stator wiring dis-connected, all three stator wires cut and freshly stripped for the new connectors I will be using.

Putting an ohm meter (on the lowest setting) between any two of the three wires results in a reading of perfect continuity with 0 ohms resistance. Putting the ohm meter test probes from any of the three leads to engine case ground shows no continuity, which I read is good. That is the extent of my testing so far. The carbs are still off the bike so I can't start it.

I am going to re assemble and re install the carbs. If I put a fresh battery in without the stator connected to anything, and without a regulator/rectifier, if I start the engine can I test output from the stator at each of the three bare ended wires without damaging anything? What should the AC output from each of the three stator wires be from each wire to ground through the multi meter? Would this be a valid test of the stator?

Paul LeClair
 
Paul LeClair said:
Now, what about a new stator for an 82 Laverda 1200 Series 2 or an RGS? What model/year Suzuki (?) stator would be a good replacement, or what is the best aftermarket stator replacement, three phase, most output?
Click to expand...

I have fitted a few Kawasaki 250 Ninja stators to an RGS and a Series 2 in the past, is a bolt on unit, little bit of fooling around sorting out the different type of rubber bung on the wiring cable but the stator bolts straight on, is also a Nippon Denso unit and to the eye looks identical
 
Hi Red

it just happens I have not gotten round to selling the 2004 Kawasaki Ninja 250 Diane crashed which led to me buying her the 2013 Moto Guzzi V7 Special which is her present ride....... I think I will go swipe the stator and the regulator/rectifier off the 250 just for testing purposes.....

thanks

Paul LeClair
 
Hi Paul,

I have had good results with Compufire 2 phase rectifier on my Mirage and the 3 phase version on other bikes.

The 3 phase one : http://compufire.com/compu-fire-55402-voltage-regulator-for-compu-fire-3phase-systems.html

Interresting reading about this: http://www.thegsresources.com/_forum/showthread.php?161397-Compu-Fire-SERIES-R-R-Install

Frank
 
Paul LeClair said:
if I start the engine can I test output from the stator at each of the three bare ended wires without damaging anything? What should the AC output from each of the three stator wires be from each wire to ground through the multi meter? Would this be a valid test of the stator?

Paul LeClair
Click to expand...
Hey Paul. I just saw that nobody answered this. From memory you should get about 80vac when you rev the engine and no it will not damage anything. It is a good way to check if the stator is in order.
Hope you get it sorted. Cheers.
 
Paul, you've measured continuity between all three wires and no continuity to ground, and there is no separate ground wire coming from the alternator, right? In that case you'll have to measure for a voltage reading between each pair of them three wires, not between wires and ground.

Regards,
Stefan
 
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