z1100r pistons

[jez1100r]

z power tell me that z1100r and gpz 1100 use different pistons . the only rings available are genuine 1st oversize . can anyone tell me how to check if the pistons fitted in my bike are actuality Kawasaki , or aftermarket .

[Al]

The one on the left is an original GPZ1100B 17mm pin.
The one on the right is an original ZX1100 as in Unitrak and 1100R1 18mm pin.

AL

[8 Valve Mark]

yours look to be 1st over-size (. 50) eg +half mm. should have Art stamps too.

[jez1100r]

what is an art stamp please

[8 Valve Mark]

take a look at AI's second picture above. art=genuine kawasaki pistons.. it should be directly opposite the 184 stamped on your photos.

[jez1100r]

thank you i have sent the pictures to my mechanic
I thought ZX1100 Unitrak (gpz a1,2,3)and 1100R1 had the same engine but zpower say they have different pistons

[gpjes]

zx11 had Teflon topped pistons and 1100r inlets not hand polished by elfin Japanese like gpz, this I know coz i'm a sad sad anorak

[z1bman]

z1100r & gpz1100 a1/a2 use the same pistons same part numbers gpz1100 b/1/b2 are different

[rickm]

Interesting that the Unitrac pistons have longer skirts and presumably must be heavier than the GPz1100b pistons?
Is that maybe partly why they need a bigger pin?