Can't go wrong with a esr cylinder. You could get a builder port it and have it set up for a plus 4 stroker crank. Have it set up for the woods riding that you do.
I have a 310 on my atc and use normal plugs i have plenty of room. It's on a 86.i will take a pic if you need be but I never have had a problem changing out plugs.I’m back and forth on what I want to do , definitely going stroker and I want the 310 kit but not if spark plugs are gonna be an issue I have the money to get the 310 kit I just want to make sure it won’t be a hassle . Everyone talks about after the stroker I will be able to hang with 450s , I’m out running them now . I beat a new raptor 700 easily. I’m putting that engine on my trx and wanted to build a stroker for the atc . It’s winter time in Ohio and I’m bored 😑
I will post some when I get home no problem buddyMines an 85 I’m not sure if there’s a difference but if you don’t mind I would like to see it and maybe I understood him wrong but the guy porting my head said he would cut into the head and I wouldn’t need a spaced plate but I could be mistaken, anyone actually have a 310 stroker on an atc ? Are you happy with it