TOPIC:

hi peeps..

i need to swap engines on my z650 c4. the one that is in the frame is leaking gallons of oil.

so i got myself a "new" engine. problem is is that the rotor and alternator are completely different. the wires on the framed one have a 3 line connector, and the "new" engine has a 4 line connector.

can i just swap the whole lot over? or is that not done?

these are the parts on the engine in frame:




and these are on the "new" engine:




the reason i want to just swap the whole thing, is that i would not have to change any wires to the generator etc... at least thats my plan..

what do you think?

thx!

looks like it mounts to the crank the same way,do the bolt holes on cover line up on engine cases?

hi,

yes they appear to fit.. just need to get me some tool to get the rotor off so i can really see if they fit..

i might be in the wrong thread i think.. should take this to electrical !

Not sure what year your "new" motor is but the 650 did some changing in the charging systems. The 77 650 has a totally different charging system than 78 and up. I think it changed again in the early 80's but am not positive. If that is a 77 motor the swap will physically bolt up but will not work with your reg/rec. Do you know the year of the motor?

Your "new" engine is a 77 (B1 or C1), the alternator is a 3-phase excited field type and will not work with your C4 reg/rec which is for a 1-phase permanent magnet setup.

However, you can easily transplant the alternator from the C4 engine to the "new" engine. Just install the rotor from the C4 on the 77 crankshaft, install the C4 stator cover with stator, plug it in and you should be good to go.

You may need to modify the cover, I think the cover dowel pins are located differently on the 77 and the C4, other than that it should be a straight swap.

Edit: Btw, don't throw away the 77 alternator, they're getting hard to find and maybe someone could use it.

Would this information help?

1979 650 B2 Charging Upgrade

(From the www.kzrider.com website)

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 has the same dimensions as the 3 phase stator used in later 650s and early 750's. I found that electrosports make a high 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 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 regulator and the same with the black wire that connects to ground. The brown wire is the regulator 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
http://sto...-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.

MFolks wrote:

After searching for info on this site and KZ650.info I found that the single phase stator that the 650b2 uses has the same dimensions as the 3 phase stator used in later 650s and early 750's.


Lou and 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.

Let me see if I understand this right. I can use a later model stator with my 77 B1 rotor?

Kawickrice wrote:

Let me see if I understand this right. I can use a later model stator with my 77 B1 rotor?

Nope. The stator, rotor, field coil, rectifier, regulator and stator cover is unique to the 77 650s - none of the 77 650 alternator parts can be used/combined with later model 650 alternator parts.

OnkelB wrote:

Kawickrice wrote:

Let me see if I understand this right. I can use a later model stator with my 77 B1 rotor?

Nope. The stator, rotor, field coil, rectifier, regulator and stator cover is unique to the 77 650s - none of the 77 650 alternator parts can be used/combined with later model 650 alternator parts.

That was my understanding. Had to ask though

hi there

ok im gonna swap the stuff around .. lets see if everything goes smooth

ok i did the swap, just need to get the engine in the frame now.. we used this tool to get the thingie off the cranck:



just found out that 2 threads on the cam cover are screwed (the previous owner had put in shorter bolts with some kind of locking goo.. nice) so helicoils to the rescue!

thx for all the help so far! (lets hope the rest is smooth sailing )