TOPIC:

Wiseco sells replacement piston rings for a 1978 Kawasaki KZ650 on Z1 Enterprises. When I put the bike model in, Wiseco's 64mm piston rings come up. But it appears the STANDARD piston ring size is 62mm. Dumb question, but the 64mms wont fit right?

I feel so dumb. I ordered them trusting what Z1 had on their site.

Those rings are not for the OEM pistons.
They are for the Wiseco performance pistons.
Wiseco rings don't fit the Kawa pistons.
IMD sell rings to fit the Kawa pistons .
KAWASAKI Z650 KZ650 PISTON RING SETS (4) STD | eBay
Also many other places if you just google.
Kawasaki 77-83 KZ650 SR LTD CSR Piston Rings - 4 Sets - STD 62.0mm Bor – Scrambler Cycle

76-83 KAWASAKI KZ650 62mm STANDARD PISTON RINGS SET 4 RINGS INCLUDE | CRUZINIMAGE.NET

Kawasaki KZ650 Piston Ring Set x4 STD. 1976 1977 1978 1979 1980 1981 1 – Disaster Motors

Kawasaki 13008-059 - PISTON RING SET | Partzilla.com

etc etc.

 

Thanks for this!

I wonder if these aftermarket ones you listed will stand the test of time?

DanMadBoy wrote:

I wonder if these aftermarket ones you listed will stand the test of time?

I always prefer OEM if available but there's many good aftermarket brands.
The IMD ones are ok.
The partzilla are genuine.

I use rings from the Nippon Piston Ring (RPR) company of Japan.

Ebay seller GoergeFix helped me out, reasonable prices, compared to OEM.


I really like the green/red color marking on the oil ring expander, which indicates clearly where the "butt join" is, and shows clearly where the upper and lower oil rings gap must be.
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Nicely packaged too: