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what pistons are these


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Hey everyone. 

ive currently dissasembled my gs750 1977 engine to find out  the the previous owner installed a bored gs750 cylinder.

the bore size is 69mm. and the pistons doesnt seem like suzukis. at first i thought i was gs850 piston installed but looke like another brand.

i my self is guessing its wiseco pistons as they have the same number on the bottom as their product number and what looks like a circle with a W in it.

im thinking i wanna replace the piston rings since i have everything apart anyways so i really want to make sure i get the right ones.

anyone have any input on these pistons and can help me ?

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8 hours ago, Franchizai said:

im thinking i wanna replace the piston rings since i have everything apart anyways so i really want to make sure i get the right ones.

 

The XC stamped on the top of the piston is the ring configuration. 

XC is 1mm top, 1.2mm middle and 2.8 oil rings.

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4 hours ago, Jaydee said:

The XC stamped on the top of the piston is the ring configuration. 

XC is 1mm top, 1.2mm middle and 2.8 oil 

Cool i ordered the 2717xc piston ring kit from wiseco. Couldn't find information about the ring dimensions others than the bore dimension.

 

Most recent pictures as you can imagine it's pretty disassembled atm.

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  • 2 weeks later...
On 5/28/2019 at 3:41 PM, Swiss Toni said:

If those wheels are OE, you may find the bike is '78 EC. And welcome to OSS. 

Im pretty sure i found out it the frame was from 1977 originally the frame number is gs750d-16287

i think i read somewhere that in certain countrys the cast wheels came earlier than other. that coud be the case otherwise previous owner changed them i guess.

 

and i found this list on a danish suzuki page

Suzuki GS 750 B 1977 GS750 GS750-10001
GS750-32603
Suzuki GS 750 C 1978 GS750 GS750-32604
GS750-45133
Suzuki GS 750 N 1979 GS750 GS750-45134
Suzuki GS 750 D B 1977 GS750D GS750D-10001
GS750D-20096
Suzuki GS 750 D C 1978 GS750D GS750D-20097
GS750D-22016
Suzuki GS 750 D N 1979 GS750D GS750D-22017
Suzuki GS 750 E C 1978 GS750E GS750E-10001
GS750E-34214
Suzuki GS 750 E N 1979 GS750E GS750E-34215
GS750E-700000
Edited by Franchizai
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30 minutes ago, gs7_11 said:

The base gasket goes round the outside of the sleeves. The bore doesn't affect it.

Ahh yes of course it does. I forgot I only have a athena  gasket though so I better get oem I think, or will it be fine there?

Edited by Franchizai
Wrong gasket name
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