130W OR 180W?

Can I use a 180w single phase stator instead of a 130w and do I have to change the rotor as well and if I can, will I need a new regulator? Question questions. Many thanks

Erol EKH said:

Can I use a 180w single phase stator instead of a 130w

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Yes.

Erol EKH said:

and do I have to change the rotor as well

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No.

Erol EKH said:

will I need a new regulator?

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This depends on what you already have. If it is the standard single Lucas Zener diode (and Lucas rectifier) then, yes.

I think LAB answered your questions but I will pile on with my own...

My 20 YO stator does not seem to be putting out enough juice to compensate for battery drain with the headlight on.
Voltmeter on battery shows 12.7 V @ idle; 13.1 V @ 3K RPM; but only 12.8 V @ 3K RPM with light on.

My AGM battery is just two years old and think it is OK. Same for Podtronics regulator - but no clue how to test it.

Do stators deteriorate over time, or was it just not up to it from get-go?

Where do you find a 180W single-phase? I though that output # was just on the 3-phase.

tomspro said:

Where do you find a 180W single-phase? I though that output # was just on the 3-phase.

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= RM23, the standard stator on all 850 Mk3s (and JPN).

http://www.rexs-speedshop.com/Genuine-L ... -Amp-tator

tomspro said:

I think LAB answered your questions but I will pile on with my own...
My 20 YO stator does not seem to be putting out enough juice to compensate for battery drain with the headlight on.
Voltmeter on battery shows 12.7 V @ idle; 13.1 V @ 3K RPM; but only 12.8 V @ 3K RPM with light on.
My AGM battery is just two years old and think it is OK. Same for Podtronics regulator - but no clue how to test it.
Do stators deteriorate over time, or was it just not up to it from get-go?
Where do you find a 180W single-phase? I though that output # was just on the 3-phase.

Click to expand...

re; "Voltmeter on battery shows 12.7 V @ idle; 13.1 V @ 3K RPM; but only 12.8 V @ 3K RPM with light on."

Volts checked with multi meter across battery terminals should be 14.3 to 14.7v at about 3,000 rpm lights on or off.
Usual cause of volt drop like this is dirty connections .

Re” Where do you find a 180W single-phase? I though that output # was just on the 3-phase.”

All alternators produce 3 phrase –that is why you have a rectifier to convert 3 phrase to 12 volt D.C.

It is a mistake to assume that a 180 w alternator will produce this amount 100% of the time even at 5000rpm, it may do for the first 10 minutes then drop off to about 75% or even 70% efficiently :!:

Bernhard said:

All alternators produce 3 phrase

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No, they don't. Also, just because a stator has three wires (RM19, RM20) doesn't necessarily mean it's 'three-phase'. The first three-phase 'RM' stator Lucas made was the RM24 (1978).

Bernhard said:

–that is why you have a rectifier to convert 3 phrase to 12 volt D.C.

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No, it doesn't, the rectifier converts AC to DC.

https://www.oldbritts.com/11_068100.html

tomspro said:

I think LAB answered your questions but I will pile on with my own...

My 20 YO stator does not seem to be putting out enough juice to compensate for battery drain with the headlight on.
Voltmeter on battery shows 12.7 V @ idle; 13.1 V @ 3K RPM; but only 12.8 V @ 3K RPM with light on.

My AGM battery is just two years old and think it is OK. Same for Podtronics regulator - but no clue how to test it.

Do stators deteriorate over time, or was it just not up to it from get-go?

Where do you find a 180W single-phase? I though that output # was just on the 3-phase.

Click to expand...

Your readings seem low. Stators don't really deteriorate unless they've been damaged. There is a test of the alternator (stator and rotor) detailed in the Workshop Manual. You need a 1 ohm power resistor of at least 100 watt rating to use as a load.

Well, at least L.A.B. answered the OP's question right off the bat, so he's taken care of.

tomspro said:

My 20 YO stator does not seem to be putting out enough juice to compensate for battery drain with the headlight on.
Voltmeter on battery shows 12.7 V @ idle; 13.1 V @ 3K RPM; but only 12.8 V @ 3K RPM with light on.

My AGM battery is just two years old and think it is OK. Same for Podtronics regulator - but no clue how to test it.

Click to expand...

I went the whole (almost) gamut last year, and, except for the LED headlight, we're back with the original system. Since most of my riding is in the 2-3000 rpm range, the OE headlight would outrun the charging system over time. That, and the 200W stator doesn't provide as much as the stock item at lower rpm's. Please see uprated-charging-system-t19016-45.html#p283434 for an explanation of the physics behind that statement.

Nathan

If anything deteriorates over time it is likely to be the rotor magnetism.