'79 650B2 charging upgrade

Ok, I had a problem with the battery discharging instead if charging after I fitted a Dyna s ignition, charging system was coping marginally with the power needed to run the extra relays, ecu, fuel pump and heated WBO2 setup that I use for the EFI that I have on my 650. If I used the headlights the voltage on the palm pilot display dropped to around 12 volts or less and at traffic lights it would drop to high 10 to low 11 volts.
After searching for info on this site and KZ650.info I found that the single phase stator that the 650b2 uses is the same dimentionally as the 3 phase stator used in later 650s and early 750's. I found that electrosports make a hi output stator ( approx 20%) more output than the late model 650 , early 750 models which had 21% more power than the B2 single phase unit. This works out to between 40 to 50% increase.
Lou and onkelb told me that I would need the 3 phase regulator/rectifier as well as the new stator.I got these parts from Pacific motorsports ebay shop and used the original 1phase rotor.
When the parts arrived I removed the 1 phase stator (2 wire) and fitted the 3 phase one ( 3 wire) with the original rubber grommet that seals the housing. There is a dimple where the 3rd wire goes, so I drilled the hole with a battery drill and a drill the same size as the stator wire.
I ran the 3 yellow stator wires to the one side of the 6 pin connector that I bought at the local car spares shop (which luckily enough turned out to be the same as the one on the electrosport regulator/rectifier), but I will have to cut the wires and put bullet connector in the wires when I remove the engine or the stator cover in the future.
The white wire is the output to the battery, I connected this one to the white and red one that was used with the original 1 phase reg and the same with the black wire that connects to ground. The brown wire is the Reg load wire (connects to the 12v switched wire that i traced back from the rear brake light positive wire)
and that was it.
Used the bike for about 300KM now and the charging is all good

Parts were:-
1 x Electrosport ESR370 Regulator/Rectifier $89.95 from Pacific motorsports
1 x Electrosport ESG010 Heavy duty 3 phase Stator $109.99 from Pacific Motorsports

stores.ebay.com/Pacific-Powersports-Accessories
Hope this info is useful for anyone else with a 650B2 that is converting from ! phase to 3 phase charging system. Special thanks to Lou (loudhvx) and Bo (onkelb)and incognito0160 as well as all the other guys who gave advise and ideas.

Thanks for the info, since I'm slowly building my 750 motor with MS I've added the charging parts to my shopping list.

Great info!

I may just do this one day as my battery slowly dies when I use some extra Driving Lights I have.
If I keep the RPMs up, I usually don't have problems, but at low speeds and lots of stop and go traffic she slowly looses power.

Great write up Dave!

Good to hear it worked for you, Dave - especially since I just installed the very same parts in my new 650 engine, just not quite ready to fire her up yet.

Btw, pretty much all the info I gave you came from Lou so credits should really go to him.

The Electrex stators and R/R's are top of the line for less the OEM. Kaw owners don't usually have as much experience with them, but if you've ever owned a Zook GS you're probably familier! :laugh: You don't have to ask how I know...

Wired George, this is what I did when I upgraded mine from 2 to 3 phase

Thank you for that, Dave. Great info on the whole process.
It all makes sense once a guy thinks about it for a while.
It's probably a worthwhile upgrade for anyone with a single phase system, IMO, even if you're not running a bunch of extra stuff.
Maybe the moderators can make this Dave's post a sticky in this section ???

Can you clarify the wiring for me. Firt items is the 3 each yellow wires from the new stator.Do they connect to the new regulator by using the six pin connector? And the brown wire why does it go back to the brake light?

The brown wire on the regulator just needs a switched 12v source. It doesn't necessarily have to go to the brake light. It just needs a voltage source that gets shut off when the ignition is turned off.

Thanks for this write-up! Great info and a solution to the discharge problem I found when a Dyna-S is installed in these charging systems:

kzrider.com/index.php?option=com_kunena&...47144&catid=4#147144