I recently picked up a 1991 Suzuki RM250 for $100. It's nearly complete other than the cylinder (and PV's) are missing. From my research I can only use a 1991 or 1992 cylinder due to the o-rings vs gasket, as well as the exhaust pipe flange not physically fitting. However, I was told that this bottom end was the same up to 1995. I'm having a hard time locating a 91/92 cylinder, much less a complete one loaded with the valves, and the 93+ ones are a bit easier to come by. Would I be able to use one of these cylinders instead? I'd imagine that I'd need matching year valves at least. Or is there anyone that manufactures a big bore kit that may come with a cylinder? I don't care about power curves or getting the most out of this engine, I just want to make it run again without dumping an unreasonable amount of money into it. Thanks in advance for any info!