Identification Help Needed

gas boy

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As per title - can anyone identify these please :rob
 

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Looks like OS High Compression 70 hp 1000cc pistons to me :) 94mm bore 9.5 to 1 comp :o

If not, could be 900 HC ones as my R90s Pistons are domed as much as that :eek

The're 90mm bore 9.5 to 1 comp










But I might be wrong
 
It's worked with plenty of part numbers in the past. I take it doesn't work with these numbers?

If that's the case what's the diameter stamped on the top of the piston? They have the earlier circlip so are 77 or earlier.
 
the part number seems to be superseded by #11251338417 s. they are/can be used for r65 86-88.. and 1977-1980 r80.. i would say they are for the iron sleeved r80/7 denoted by the S. my parts shop has them for 119$ with the old stock number. they also seem to be the not HC pistons from parts fisch

the other set. #11251258063 suprseded by# 11251258064. they are r75/5 pistons 8/69-7/80 ECE. i believe these are HC and listed at N/A but they have some for 189$
 


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