77 B2 reg/rectifier question

Quick question about 77 B2 rectifier and regulator. I noticed both were on a rubber mounted plate on the donor bike. I always keep my regulator and transistor box mounted to my solid rear fender just behind the battery box. Open area on my bike.

Can I solid mount these old girls to my metal fender, or do they dislike being attached to ground?? I seem to remember some old Honda ones that didn't like that. I doubt the old regulator would mind much, it's the rectifier I'm iffy on?

Both of my kZ's ('76 KZ900-A4 & '78 KZ1000 B2) the rectifier is mounted with a stud fed through the body, nut for air gaped offset... The regulators are flat plate mounted to a frame bracket.

Just went through where I lost my rectifier on my 900, part numbers are identical even though rectifiers are different where diodes exposed, other not....

The rectifier in one module (exposed diodes) has a separate ground (conductor to frame) while the other doesn't thus depending on a solid grounded mounting...

Electrically speaking, add a ground conductor from battery (-) or truly grounded frame to your fender where the components are bolted/mounted... Use the O-ring conductor terminals to the component bodies under mounting bolt head. Do this for both the rectifier and regulator.

Not sure of chrome regarding heat dissipation though...
I would think it would be ok but others may know differently...

Are you planning on extending your wiring lengths from rect/reg to electrical panel (white & green plugs)?

Images please on the final....

OMR

What bike?

Sounds like a 1977 KZ750-twin B2?

According to Kawasaki, the 76 B1 and 77 B2 use an excited-field alternator. That is very different from the permanent magnet alternators on the 900/1000. However, even though the regulators are very different, it's possible the rectifier is the same. Not sure on that.

Your regulator will not like vibration if it is the original mechanical type. Vibration will cause the contacts to vibrate and alter your voltage. It can be mounted to ground, but for vibration reasons it should have some sort of rubber mount. A new, solid-state one, won't be affected by vibration, (unless vibration damages it, but normally won't affect it).

And for reference, in case you use the Kawaski site for parts comparisons, if you use the feature where it lists other bikes using the same parts, that is notoriously worng especially for regulator/rectifier/alternator info. Kaw used a lot of different charging systems in the 1970's and early 1980's. It's ball of confusion there. The parts/years/models on the actual fiche images are usually more accurate.

DOH!!! Good point Loud... Unfortunately was assuming KZ1000 was the KZ in question... damn it, there you go for assuming again...:blush:

Update your profile Capt....

Doh, Ok done it. Sorry "Old Man Rock", I was wondering where you guys where listing your bikes.. it's in my signature now.

When it comes to me you can safely assume we are always talking about a Frankenstien bike. LOL. So we are talking in this case (a 1983 K1 750 Twin belt drive, that now has a 1977 B2 750 twin motor, and wiring harness.) For the next few years at least.. rofl

Yes it is an excited field stator. The rectifier is a 5 wire unit with 3 stator wires, a 12v out wire, and a ground wire. Also my wires are long enough to put it anywhere. I strip all my harnesses to the minimum. I only require a head/tail, and machine power.

Sorry camera so cheap it don't even got a flash, shop poorly lit, etc. but here is an image of both reg/rect.





Both currently mounted to the rubber mounted battery box so I could get the old motor fired, tuned, and check stator output. I runs fine now, so I need to finish her up. Regulater and spark box will stay in their current positions, but I'ld like to move the rectifier.

On my 77C1 the rectifier is solid mounted and the regulator is rubber mounted.

Mark