Truth is,at 50 years old and 240 pounds,the 450 is just easier to ride than my beloved 05 YZ250.Which I have put SSS suspension on,GYTR heavier flywheel,V-Force 3 reeds,and an FMF Fatty.Along with Flexx bars, UFO Restyled plastics and a new,custom 200 dollar graphics kit!!!All within the last year!A month ago, a friend asked if I'd like to buy his Dad's 07 450,low hour,trail ridden bike at a very reasonable price.....so I did.I fell in love with it immediately.The power on my 250 2-Stroke was still pretty frightening,even with my mods.My number one factor in liking the 4-stroke is the ease,stability,and tracking while coming out of a corner and over a jump.The 250 throttle was still just too twitchy to me.(I ride Motocross,and the local track is pretty gnarly!).However,I did have a horrible experience with an 06 YZ450 a couple of years ago....2 total catastrophic grenades within a year(which is why I got the 2stroke to begin with),so I wanted to make sure my new 07 was fresh and ready to go.While putting in a new top end,my mechanic friend noticed that the lining on the cylinder had a couple of tiny chips in the lining of it,with a bit of scoring on the walls,so I've decided to get a new cylinder,and my question is........should I spend the $275.00 on a brand new OEM,or get a remanufactured,re NICOM coated cylinder from US CHROME for 160.00 after I get $50.00 back from mailing them my old cylinder????Any thoughts?? Thanks alot!!