GS 1000 pistons

[Ole]

Can you folks help identify this piston. It is 73,5mm so i think a 1100 big bore kit off a kind. I might need new rings but i dont know where too look. I am about too start a project on a 79 GS 1000E. It is almost complete but in boxes, so long term job 

Mvh.   Ole

[dago]

Could be wiseco ?

[Gixer1460]

Looks like the Wiseco icon in the oval to me! Are you sure its 73.5mm? As the part # looks like 4064 which is a 73.00mm bore . . . . https://powersports.wiseco.com/k1085 If it was a 73.5 the piston # would be 4066 . . . . . https://powersports.wiseco.com/k1100

The correct rings are listed on the appropriate page.

[Reinhoud]

Total seal can get you (almost) any size you need

 

https://www.totalseal.com/

Edited September 20, 2022 by Reinhoud

[denisd]

It looks like 4034 to me! Correct me if I'm wrong please. 

I stand corrected! 

Edited September 22, 2022 by denisd
Gixer1460 has better glasses than me

[Ole]

I think you're right, Wiseco it is, must have measured it wrong. now i get 73mm. I have put a picture off another set i have, branded with the W, but this set have numbers on the top. By the way this is where i am with engine, see pic   I have ordered new oilseals for crank and transmission and new bearings for the clutch. Anything else i should pay attention too? 

[Swiss Toni]

Have a look at the cam chain tensioner & guide for cracking.  Measure camchain for stretch. 

[Ole]

Thanks for the replays

[Rsvfletch]

1085cc 73mm wiseco pistons. Nice upgrade.