Rears sprocket change

Hello once again all, now that riding season is over it’s time to fix and improve the bike for next year. I have an 81KZ750 H/LTD. Right now I think I am running the original sprockets but I am unsure. I’m looking to lower RPM at higher speeds. What sprocket should I get and will it work with the standard chain? 

You can either go with a larger sprocket on the front or a smaller one on the rear, or a combination of both.  My preference is to go larger on the front.  Count the number of teeth on your front sprocket and go with either one or two more teeth, depending on how much room you have for the chain to rotate.  Another thing to watch is that the chain clears your swingarm.  You don't want it to rub.  

I'd like to do the same on my 82 750 LTD...I had the cover off to change the clutch cable and it looked like there's not much room for a bigger front sprocket.  Hoping someone who's done it will chime in....
13/32 is listed as stock for mine....630 chain

A Z1 comes with a 15 tooth front sprocket but there is enough room to go up to 17, although I've never gone above 16.  If there isn't enough room on the front then the only option is to go smaller on the rear.  If stock is 13/32 that would be 2.46 ratio.  Going up one tooth on the front would give a 2.29 ratio.  But if it's too tight to fit a 14 tooth front then a 30 tooth rear would get you close to the same ratio at 2.31.  Just be aware that a smaller diameter rear sprocket might result in the chain rubbing on the top of the swingarm.  

I'm surprised they use 630 chain on the 750.  That's the same chain used on Z1/KZ1000.

Well I can’t find a 30 tooth rear in 630 so looks like a 14 tooth front is our only option. I’ll look tomorrow and see what clearance is behind the cover. 

Any time the cover comes off is a good time to clean things up a bit!

If you are changing sprockets you should also take the opportunity to rid yourself of that 630 chain. A spreadsheet can help you figure out the conversion and what you can expect your R's to be at 65 MPH. 

Okay, I understand you. What’s the benefit to swapping to a 530 chain? Cost vs benifits? Especially considering I have a chain with only 1800 miles on it, and a rear sprocket that looks brand new. Not sure of the condition of the front sprocket but I’m sure I’ll see it soon. Definitely will be sure to clean up while I’m under there. 

It's a little lighter and a little cheaper.  If my chain and sprockets were new I would probably stick with what I had.

By Elfarm98648:  ... Definitely will be sure to clean up while I’m under there. 

Be sure to clean up the neutral switch & terminal.  my neutral light was glitchy, so after cleaning the switch post & terminal, I crimped the terminal a tad for a tight fit >> don't crush the terminal. not sure if a replacement is available anywhere & I forget what type it is. I think Scirocco posted once but I forgot. doh.

Good tip on the neutral switch! Will for sure check it out. As far as the chain and sprockets go I think the only one I will change is the front one for now. And that’s if I have the clearance to do so. I still have not checked to see if there is clearance. Maybe sometime this week after work I’ll have enough energy to get down there 

I noticed a real improvement when I switched to the 530 chain. It was quieter, smoother and seemed to accelerate better. 
I always read where you are not supposed to change out sprockets individually but if they are fairly new that shouldn't be a problem for you. Changing them all does give you more options re: final gearing though.