Topic: 550f/k stator amperage capacity

[BomberMann650]

In the history of honda service, does anyone recall the amperage output of the 550f/k stator/field coil?

I'm looking to add an extra 15 amp circuit to the build. 
On top of the existing load for the Dyna2000 ignition and innovate MTX wideband. And maybe the holley micro fuel pump.  Would like to know for certain if the generator can support the additional accessory.

Ricks website doesn't advertise amp rating on their oe replacement.  Am assuming it's the same as the manufacturers winding.

Pic for attention

[dave500]

i wouldnt be surprised if 15 or 20 amps was max for a start?

[Oddjob]

The very first 500K0 got a 200w alternator but it soon changed to a 150W one and that was used for all the rest of the run including the 550.

So 10-12 amps on the first K0s and around 8-9 amps for the later.

Not exactly a lot is it.

[calj737]

Send Electrex World an email and ask if theirs is available standalone and what its capacity is.

[Oddjob]

The Electrex RPK1550 has a 25 amp output. It's a full race kit though and is very expensive at over £500, it includes a combined stator and field coil, rotor and reg/rec. The 3 phase system produces 25 amp plus and the single phase for race use produces 15 amp. There is also a stator replacement available, the G404, which is a LOT cheaper at £165 but unfortunately they don't give any output figures for it. Both are built to order as a rule.

[BomberMann650]

Thanks Cal & Oddjob

Looked up the electrex kit and sent them an email. 
Questioned compatibility with the ricks reg/rec and shorai battery.

Would be a good investment for the build.

[Deltarider]

AFIK all CB500/550s have the same alternator: 200 Watts @ 5000 RPM.

[Oddjob]

It’s 150w watt, only the very first 500s got the 200w version, most likely those with the square crankcase front.

[HondaMan]

It’s 150w watt, only the very first 500s got the 200w version, most likely those with the square crankcase front.

Weren't those also the ones where the "HONDA" logo fell off the alternator cover shortly after purchase?

[Oddjob]

Maybe the extra 50w caused that 

I always said the 500 charging system was under powered, in heavy traffic with brake lights and indicators going if you also had the lights on it struggled to keep the battery charged. One of the reasons I think why they fitted such a low wattage headlight bulb.

[scottly]

I seem to recall reading 2 or 3 different specs for the 500/550 alternators, where the differences in output varied according to engine RPM. What was the RPM on the 150 watt spec?

[jonda500]

I thought 150 watts would be 12.5 amps and 200 watts would be 16.67 amps?
John

[Oddjob]

3k and above I believe.

I seem to recall the information regarding the early alts and the later ones came from Mike Nixon, I wasn’t aware of it before that.

Could be right Jonda, I used the web to give those figures and we all know how inaccurate that can be.

[scottly]

The different specs I recall were in Honda manuals, not from the web. Even so, 150 watts @ 3000 RPM and 200 watts @ 5000 RPM would be plausible.

[scottly]

I found that the 500 K1,K2 was rated at 200 watts @ 5000 RPM, and the 550 was rated at 110 watts @ 2000 RPM. Why Honda chose different RPMs for the rating in the manual is a mystery?

[bryanj]

The early K0 had round pin connector blocks whilst the later went to standard 6mm spade type

[Deltarider]

I remember that in the past I have compared all data in the official Honda documents concerning the CB500/550 alternators. I came to the conclusion they all perform the same. In the manuals specs differ however, but those differences relate to notations at various RPM. If you can't understand that @ 5000 RPM (note that I have put it in italics and the 5 in bold already in reply #6), than it's back to school for you, I'm afraid.
When an alternator is rated 200 Watts @ 5000 RPM, and we read 14,5 Volts across the battery terminals, then I am not far off, if I deduct the alternator is in theory capable of some 13A.
Then this. Over the years I have become sick and tired of all these claims that the CB500/550 charging system had been designed as insufficient. For Americans the charging system will never be sufficient. They want overkill in everything and just can't see the beauty of an economical design. In spite of the US housing only 4% of the world population, it consumes 25% of the planet's raw materials.
My final argument that there was nothing wrong with the CB500/550s charging, is in this video.

[Oddjob]

Nobody cares what you think Delta.

[Deltarider]

Nobody cares what you think Delta.

Yeah... whatever but I'd rather see you come forward with arguments to substantiate the statement you made in reply #2.
In case you've missed it, later CB500/550 models consumed more power than the K0. Some got the dreadful headlamp-always-on wiring and silly gadget lights which wasted another 16 Watts; later models for Europe got 60/55 Watts H4. You'd thought that by then Honda's R&D had discovered their mistake in designing the charging system.

[scottly]

For Americans the charging system will never be sufficient. They want overkill in everything and just can't see the beauty of an economical design. In spite of the US housing only 4% of the world population, it consumes 25% of the planet's raw materials.

Delta, you have been warned about posts like this.