Hey guys this isn't my 1st time posting on here but I have a question I just got this 87 trx250r off of a guy that won it in a raffle so he didn't know nothing about it and then the guy that raffled it didn't know nothing about the motor it. So I ran it at Ironman and quickly realized the jetting was way off. It had a stock 34 pj carb with stock jets in it. I did a quarter of a lap and parked it not really worrying about it because it was getting gone through and rebuilt before 2020 gncc off and a has a 71.95mm piston in it. It has the stock jug with a huge sleeve in it. So it it possible to put a 310 sleeve in a stock cylinder? I would assume that you needed a different jug with bigger water jackets and all that for cooling but I have zero experience with BB in general..