750 motor into a 650

have found a 80 kz750 motor for little money and as my 650 is very tied i got to thinking of swapping them over.
do i put the whole motor in or just swap the top ends over?
the new motor has no carbs with it, so what do i need to look for?
was going to strip the 750 down anyway and give it a freeshen up with poss a flowed head at the same time.
any more tweeks worth doing while its all aprt?
cheers rob

just swap the whole thing over, it fits right in.

As Mario says the 750 engine bolts right in. However, since you have a 77 650 the charging systems are different (excited field vs. permanent magnet) so you will either need a 750 reg/rec and some wiring work or use the 77 650 alternator with the 750 engine.

we put a ltd 750 in a sr650 years back and swapped the stators...that thing was a great bike ...can you say pop a wheelie....lol....it fits like the guys allready said and is a great cheaper way to keep on keeping on...have fun...good luck...craig:woohoo:

If you replace the 750 stator with the 77 650 stator, I'm pretty sure you will have to swap the 650 stator cover onto the 750 also.

Unless you have a solid state replacement reg/rec, I would use the 750 reg/rec and do the minor rewiring.

The 750 has electronic ignition also, so you need to find a stock 750 igniter (or make one). Or you could take a step backwards and use a Dyna S.

Or convert the 750 to the 650 points system (not on a bet!)

so it looks to be a worthwhile swap, will get this motor and pull it apart, see if it needs anything. dont wna tto do a load of work only to find out the new motor is junk as well.
what carbs do i need to look for as the engine has none on it?

steell wrote:

If you replace the 750 stator with the 77 650 stator, I'm pretty sure you will have to swap the 650 stator cover onto the 750 also.

Correct, the 750 stator cover does not have the provision for the field coil.

Unless you have a solid state replacement reg/rec, I would use the 750 reg/rec and do the minor rewiring.

That would be my choice too.

The 750 has electronic ignition also, so you need to find a stock 750 igniter (or make one). Or you could take a step backwards and use a Dyna S.

Yeah, good point, I didn't think of that.

CV34's came on most of the 750's. You can run the stock 650 VM24's with a rejet and maybe a different clip setting on the needle.

the 650 carbs going to be big enough for the 750? would've thought you would need somthing bigger

Several memebers on the board have used them. I have an extra set I'm setting up for my 750, but have not used them myself yet.