ATC 90 and the 56mm piston won't work. What can I do to solve the problem?

[turbowrenchhead]

So I asked questions and did some research and ppl said that the 56mm piston kit will work on the ATC 90. I had to get a 110 cylinder, crank/rod, head bolts and timing chain. I brought the cylinder to the machine shop and they said the wall will be paper thin. So after I have all the parts now I can't do it. The 54mm piston on DrATV is probably a 14mm wrist pin. Will a cylinder off a 125m swap over to my engine? Would this solve the problem?

[Jason Hall]

I think you will need to sleeve the cylinder up, and then bore the case's to fit the bigger sleeve.

[trizilla]

your STOCK ATC 110 cylinder will BORE OUT to use the 56mm piston. whats left of the sleeve is not actually paper thin and any one telling you this is full of crap. i have this exact set up sitting in my shed. im going to go measure whats left of the sleeve right now for you.

[turbowrenchhead]

Much appreicated. I think I will be taking it to a different machine shop.

[trizilla]

sorry i forgot this. you will be left with 1mm of skirt left all the way around the piston. doesnt sound paper thin to me, how about you? i think you have the right idea with going to a different machinest.

[riverrat]

How many cc's will this give you?

[trizilla]

How many cc's will this give you?

should be 123 to 125cc.

[turbowrenchhead]

I came up with 122cc's. Their is a chart on DrATV.com.

[turbowrenchhead]

Monday I'm calling them and asking them again what the wall thickness will be. They measured the piston at 55.9mm. My micrometer gave me 55.5. It is advertised as a 56mm piston. They didn't give me any other measurements. If they won't do it I'll take it to a different shop. They are a bit more for the same service but at least I have another option.
If I have to I will get it sleeved. I'd rather do that then not utilize all the parts I have collected.