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Nessism post=850246Stock is 15/35 with a 92 link chain.

To match the stock front sprocket size (which is recommend) you need to go +3 teeth so that means an 18T front sprocket

15/35 = 2.33 ratio

18T x 2.33 = 42T rear sprocket

92 link chain x .75" per link (for 630) = 69" chain

69 / (5/8) = 110 link chain in 530

BTW the 5 in 530 means 5/8" between links.  The 6 in 630 means 6/8" (3/4) between links

I found this calculator, which gives a bunch of values for different gear and chain sizes.

www.blocklayer.com/chain-sprocket.aspx

The thing I thought was interesting was the "optimal wear rate" calculation. I have no idea how important it is, but it's interesting that the original values of 15/35 with 92 links is 100% optimal.  Same goes for 15/33-92 for the 1978 KZ1000.  

However using the direct conversion 530 chain numbers of 18/42-110, it comes out as only 50% optimal.  

Any chance that a 19T 530 sprocket will fit in the front without hitting anything?  The closest combination I could find that is 100% for both front and rear sprockets is 19/43-112.  That's a ratio of 2.263:1, which sort of splits the difference between the factory 15/35 and 15/33 ratios.  And it also splits the center-center distance as well.

Wow. Never saw that one before. The optimal wear rate chart is "off the chain"! LoL Now you have me thinking the 18/42 530 conversion is going to be shot in less than 10k miles.

I run 630 chain on three of my bikes.  I usually go with stock rear sprocket but go up one tooth on the front to slightly lower rpm's at highway speed.  I do this because every Zed I've owned begins to vibrate the mirrors at 4,000 rpm, which is right at 100 kph.  With the 16 tooth front it's just over 105 kph, so it allows me to see what's behind me at highway speed.  Lately I've been thinking of going to a 33 on the rear of one of my Z1's to see how it performs off a stop light.  If it doesn't bog out I may go that way permanently to further reduce rpm's at highway speed.

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Any chance that a 19T 530 sprocket will fit in the front without hitting anything?  .

Yes! I run 19t 530 .
Plenty of clearance.
Have heard 20t will squeeze in too.

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So.. .yesterday I gave up on converting to 530.  Z1Parts only has rear sprockets 48 through 51 and the math trying to convert that is making my brain hurt.  Path of least resistance is stay with 630. I ordered new 630 sprockets today, went down one tooth from stock in front and a 35 in back.  This whole journey started because the Z1 needs new sprockets. A friend gave me a brand new 530 O ring chain a while back and I thought if I go with it I just need to buy new sprockets instead of new chain and sprockets.  Anyway... screw it.

Very odd.  Z1 has the exact 530 sprocket you need in stock.  Oh well...

Yup, they sure do. I just looked them up. Says they're in stock.

You wouldn't believe the hoops I've jumped through with them.  (I'm assuming you're referring to Z1Parts, not Enterprises).  There was no problem with the front; it was the rear I couldn't nail down.  I called on 4 or 5 occasions, talked to Celeste, said she would check and get back to me. I'd wait 3 or 4 days, call back... same thing.  Finally on last attempt she called back and said they had some rears but 48 was the smallest size.  That's when I finally said F it.

Checking Z1Enterprises I see they have this.  6 hole, I assume it would fit?  But I have no idea what front would relate to  14 - 35...  one down in front from stock.

www.z1enterprises.com/yamaha-xs650-sproc...20-256-25434-10.html


 

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So.. .yesterday I gave up on converting to 530.  Z1Parts only has rear sprockets 48 through 51 and the math trying to convert that is making my brain hurt.  Path of least resistance is stay with 630. I ordered new 630 sprockets today, went down one tooth from stock in front and a 35 in back.  This whole journey started because the Z1 needs new sprockets. A friend gave me a brand new 530 O ring chain a while back and I thought if I go with it I just need to buy new sprockets instead of new chain and sprockets.  Anyway... screw it.

Very odd.  Z1 has the exact 530 sprocket you need in stock.  Oh well...

Yup, they sure do. I just looked them up. Says they're in stock.

You wouldn't believe the hoops I've jumped through with them.  (I'm assuming you're referring to Z1Parts, not Enterprises).  There was no problem with the front; it was the rear I couldn't nail down.  I called on 4 or 5 occasions, talked to Celeste, said she would check and get back to me. I'd wait 3 or 4 days, call back... same thing.  Finally on last attempt she called back and said they had some rears but 48 was the smallest size.  That's when I finally said F it.

Checking Z1Enterprises I see they have this.  6 hole, I assume it would fit?  But I have no idea what front would relate to  14 - 35...  one down in front from stock.

www.z1enterprises.com/yamaha-xs650-sproc...20-256-25434-10.html




 

Yeah, I was referring to Z1 Enterprises instead of Z1 Parts, my bad. Sorry you had so much grief. I just ordered all that stuff off another site. Last I looked I had a brand new 630 chain sitting up on the shelf with all my chains waiting to go on this bike. I was going to slide it on and let it ride on these sprockets since they look perfect. Went to get the chain out of the cabinet and it's not there. Probably pulled it out and hid it from myself. Oh well, going 530 now. Going 520 on my other bike. 
On that SX650 sprocket, the center is 10mm larger than the KZ sprockets, I'd find the correct JT488 style sprocket before I used that one.