I thought it was but if I supply the pistons (about 180 a set) they do the full sleeving with 83mm sleeves supplied all square to the crankshaft and honed for $500 at footscray engine reconditioning.
http://www.ferco.com.au/
I just checked again on the phone & will do it with 81mm sleeves supplied for $300 !!!!
Quoted from Steve for an a10, a12 or any a series with either 79,80 or 81mm sleeves.
He can work out the offset required with sonic testing and if grouting is needed he will have to send it out as they dont do it in house but he said he can sonic tested for free to check all tolerances which is more than fair.
I was interested in taking my a10 to 79mm using 1mm oversized mazda PISTON ASSEMBLY KIT 4KRY8041(1) 31.40 c-c and 20.000 pins but need Hayabusa standard conrods with 20mm G/pins
and a10 length 119.5mm from bike wreckers. They are perhaps a little narrower than A10 rods
which is the issue. big end and small end width 20.975mm and 38mm crankpins.
The other option is 4af or 4afe pistons with 18mm g/pins will fit a10 rod with enlarging.
After talking to my buddy with the idea of boosting an a10 I must admit I love the stock gearing with 59mm stroke it just works.