Piston rings set

Here are the pictures of the piston and rings (oil ring is 1 piece). Jim at Redline felt the 1 piece oil ring was never used on a KZ 1000. Does this and my piston pictures, confirm these are Honda pistons as mentioned earlier by Zed? And is a 1 piece oil ring for Honda pistons available today? Here are some ring measurements with a digital caliper ( don't have that small of micrometer. 
Oil ring- 1 piece  thickness  2.50mm x width 3.20mm
Top comp. ring.  thickness  1.50mm x width 3.20 mm
2nd comp. ring.  thickness  1.50mm x width 3.20mm
Feeler gage in piston ring grooves- oil groove 2.50mm and comp. groove 1.50mm
Thanks

You would probably be best contacting the guys at IMD with your measurements 

zed1015 wrote:

Tjpgi wrote:

Thanks to everyone for the input. Here's some pictures of the project bike and a piston.
Do you guys think this piston/ring kit for a 77 KZ1000 (standard bore) work?
ebay.com/itm/304952801100

Your pistons appear to be Honda CB450/500 twin so you will need two sets of std rings for those.
I've had a few 900's with the Honda pistons fitted as shown in the attached pic.
Zed 
Do you remember if they had a 1 piece oil ring? I found a number for OEM Honda rings 70mm for the CB twin as 13011-375-005, but I'm finding suppliers with a multiple piece oil ring for this number.
Thanks

One piece oil control rings are inferior at "controlling oil".  If at all possible, you want three piece oil control rings.  I have no experience at converting, but just say'n...

Yes, the CB450 used a one piece oil ring, CB500 changed to a 3-piece. Restoring a CB500T at the moment.   

asphalt900 wrote:

Yes, the CB450 used a one piece oil ring, CB500 changed to a 3-piece. Restoring a CB500T at the moment. 

 

I looked up the CB450T and I still get a part number the same as the CB500 which is as you say a 3 piece oil ring. Would you have another part number for the CB450? I bought my 76KZ from a guy (he abused it badly) in 1980 so the ART piston and rings have been in it since at least before I bought it.
Thanks
By the way good luck with your project!
Addendum: Found it in a 1974 CB450T parts diagram 13011-292-000 
Thanks, now let's see if I can convert to 3 piece oil ring? Will discuss with IMD.



 

Tjpgi wrote:

Zed 
Do you remember if they had a 1 piece oil ring? I found a number for OEM Honda rings 70mm for the CB twin as 13011-375-005, but I'm finding suppliers with a multiple piece oil ring for this number.
Thanks

If you study my pic you will see that they have 3 piece oil rings which is what you need.

zed1015 wrote:

Tjpgi wrote:

Zed 
Do you remember if they had a 1 piece oil ring? I found a number for OEM Honda rings 70mm for the CB twin as 13011-375-005, but I'm finding suppliers with a multiple piece oil ring for this number.
Thanks

If you study my pic you will see that they have 3 piece oil rings which is what you need.
Mine are 1 piece, so perhaps I can convert to a 3 piece. Honda 450T had the number for the 1 piece but then superseded this with a 3 piece oil ring when they upgraded.
 

Tjpgi wrote:

Mine are 1 piece, so perhaps I can convert to a 3 piece. Honda 450T had the number for the 1 piece but then superseded this with a 3 piece oil ring when they upgraded.
 

The 450 and 500 piston ring grooves are the same dimensions.
No need for any conversion.
The 500 ring set with 3 piece oil ring fits both the 450 and 500 pistons with no modification.
The 3 piece oil ring is superior which is why it supersedes the 1 piece in replacement sets..