2018 recon 250

Hi there. My sons 2018 honda recon 250 started blowing white smoke and leaking oil out of the exhaust. Took it to dealer as it wasnt a year old yet and have extended warranty. piston got torn up on one side. Warranty didnt cover anything and dealer wants an arm and a leg of course. I have a good friend who will rebuild top end but i cannot find a kit online for that new of a quad. Anyone point me in the right direction would be appreciated greatly. Thanks.