I am just wondering, what are the major differences in between the 400ex and 300ex. I am going to buuy one, and I want to know which would be right for me.

 

I own both, 400 for me & 300 for the wife. The 300 is smaller, both dimensionally & ergonomically, is less powerful, has less suspension travel, and is narrower. It won't climb, accellerate, jump, slide, or stop as well as the 400. It will wheelie as well and is less intimidating for novice riders. It also has a better seat (firmer) than the 400.

Also, the 400 is a better candidate for engine mods since it's suspension is race ready from the factory, wile the 300's is "sport" at best. You can hop up the 300's motor and rebuild the entire suspention to handle the extra power, but ultimately there is more hp potential in the 400 than the 300.

Oh yea, the 300 is less expensive too.

 

We have both. I would say get the 300 ONLY if you are on the smaller side, or you are a really new beginner. I am 5'7". The 300 isn't cramped for me, but it's pushing it. You can mod up either bike for more power.