simple wiring for a 650

i'll try to give as much background as quickly as i can. (deep breath) i have a 80 750H with an engine that is losing compression and leaking oil from almost everywhere. so i picked up a 650B, i was told the year was 79, with plans to swap out the engines until i could rebuild my 750. the problem is that the p.o. wanted a drag bike and got rid of all the charging system. under the left side engine cover there is no alternator (there should be one i assume like on my 750), there is no reg/rec or anything else.

what i was wondering is could i use the reg/rec combo from my 750 along with the alternator. and just so i am clear these are the only two things i would need as far as charging system goes right? i'm planning on going pretty minimal in the wiring department and the bike is going to be kick-start only with a headlight and tailight (that's it for electrical).

thanks in advance for all the help and i'll keep posted on the status

im thinking yes check out the wiring diagrams of both models they should be in the kz info banner at the top of the page, what are you going too do with that 750 motor i might be interested in the cylinders if there not gouged up and the price is rightB) matbe loudhvx will chime in he's the electric guru on here

i checked the wiring diagrams and they look like they match up, so i guess i'll give it a go.

i'm planning on rebuilding the engine to have a backup in case something goes wrong. thanks for the advice

There was a bit difference in the early 650 and later 650 charging systems--changed between the 77 and 78 model years or early in 78--and they're not interchangeable. My guess is that the 750 and '79 650 would be quite close. Actually, it's more important that the charging components in the engine match what's on the frame so swapping those parts from the 750 engine would be a good idea anyway.

It takes a stator, rotor, and reg/rec for your type of charging system. (The 77 650 was very different, as Nate mentioned.)

You'll need to swap both the stator and rotor from the 750 if the 650 had neither. If the 650 still has the rotor (it's the flywheel) you might be able to just bolt on the stator (and cover) from the 750. Some have converted their 1-phase 650's to 3-phase while using the same rotor, but I can't confirm all are compatible physically that way.

Some general info not necessarily for your situation unless you will use the 650 rotor:
The 650 was 1-phase, and the 750 is 3-phase. The number of phases is determined by the stator. The reg/rec must be 3-phase if the stator is 3-phase. (Some people have found the 3-phase reg/rec can be used with 1-phase stators.) In the case of the KZ 650/750 line (excluding the 77 models), both 1 and 3 phase types can theoretically use the same rotor as long as the physical dimensions allow the stator to fit the rotor closely with no interference. That is because the stators have pole pieces in multiples of sixes. (1-phase has 12, 3-phase has 18.) This allows both to use rotors having 6 magnets. (There are sometimes only 3 physical magnets, but each has 2 sets of north and south poles... not sure why or even how.)

okay, i'm beginning to better understand what your talking about and what it is i'll need. just to be safe i'm gonna swap everything (stator, rotor, reg/rec) from the 750 over to my 650. then i'm gonna throw the 650 into my frame and have a much simpler kickstart only beast well, not really a beast but fun nonetheless.

thanks again for everyones responses and insight

so, i've been trying to take the rotor off and can't seem to loosen the bolt holding it on. should i impact gun it or is there a better way to go about this. the reason i ask is because i don't have access to an impact gun so i would need to go rent one

nevermind, i figured everything out...with your help. bike starts and electrically is running superbly. thanks again everyone.

Cool! glad it's up and running