I got the chance to ride a KTM 400exc yesterday and thought it was the best thing since sliced bread. It had the perfect engine, and felt much lighter than I thought it would. After 3 250f's, I'm thinking of going orange on my next bike. I currently have a 262 kit and have read all the posts on big bore kits. Can anybody compare these two engines specifically? I know the 290 is smaller, but is the power delivery similar? In what way is it different? I'm either going to buy another yz and install the 290 kit, or just get a KTM 400. Thanks.