This past weekend, the tank on my 01 WR426 cracked and spewed fuel all over everythng...including my crotch. Now it's time for a new tank. I really like the idea of going with the 4 gal. IMS tank for the WRs. IMS also makes a 3.4 gal tank for the YZs that will fit the WRs if I go for a YZF seat and shrouds. I'm a firm believer that with gas tanks for desert riding, bigger is better so my first instinct is to go with the 4 gal WR tank. I have, however, hreard a lot about the better ergos of the YZF set up. The width of the stock WR seat/tank really hasn't bothered me (I'm coming off of an old RM465 with a 4.5 gal desert tank,. so I guess I was used to it). Does anyone out there have any experience with both set ups? Are the improved ergos from the YZf set up worth the cost of a seat and shrods and the reductin in range going from the 4 gal to the 3.4 gal tank? All opinions (preferrably experience based) are welcome!