can anyone identify these pistons

these are 75mm high comp out of a gpz motor , i need to identify them so i can get some rings , they got a lazer etched code on the flange under the wrist pin but nothing else

code

inside the crown has been machined away

another view

You already have the size of them, just measure the grove with. The rest is simple. They are from a 1166 kit if they have a 17mm wrist pin or from a 1170 kit if they have a 18mm wrist pin.

thats the big problem im having otakar , the oil rings are an usuall size and no one this side of the pond can get any , someone said they were wiseco pistons when i sent them to him , he ordered a set of rings and the top two fitted perfect , i gapped them correctly and put the motor together , man it smoked like a two stroke and filled my garage in a couple of seconds .
i stripped the head off and all 4 pistons had oil on the tops , id done a comp test before i fired it up and it had good readings on all 4.
i took the oil rings off and measured them against the old set , the new ones had a different radial size and were slightly thinner , i never measured them before i built it up as i've never had any prob with oil rings before. :blink: you live and you learn i suppose .
anyway , no one can find me any rings unless i can identify the pistons , my only choice seems to be , have a set made , i would reuse the originals but it seems i threw two away when i cleaned up so im up the creek without a paddle .

Just reuse the spacer rings from the old oil rings and you should be fine. What is the grove size of the oil rings?

Measure them and call Hastings. I got rings for them for an old 1166 Wiseco piston kit a year ago. Nobody else had any as the 1166 KZ kit has been discontinued.

thanks for the replies , these pistons have the 17mm wrist pin but the bore size is 75mm , not a size that wiseco seem to list , i've sent hastings an email so hopefully they can help .
sizes are
piston groove height 2.5 mm
piston groove depth 3.57 mm
kev

You can look up all the hastingds rings on their web sight. ALL the sets are listed.

Also had good luck with odd ring sets from Total Seal in Arizona. www.totalseal.com

kenty wrote:

inside the crown has been machined away

I think that's from balancing.