Hey guys, I have a question about engines on the RMX's. I have a 1996 and was wondering if the bottom ends are the same on the 1990. Also if anybody else has other info on these bikes that can help me out with. I did the search to learn as much as I can and know that the base gasket on the earlier years is thinner for more compression and the FMF pipes are a good replacement over the stock. Remove the air box lid (mine was gone when I bought the bike). I'll probably replace the stock reeds with Boyeseen ones. If you can email me at higgzz@hotmail.com or reply to this post that would be great. thanks