I owen a 2005 Honda Rancher 350  ES 4x4 i would like to go a larger tire size like a 26 inch as my first choice or a 25 inch tire like a ITP mud lite 6 ply along with larger size rims my question is. Would the larger tire size cause any clutch problems if i went to a 26 inch size staying with the same tire width.  

The big issue with going too big on tires is power or the lack of. For a 350, you are safe with 25's as long as they are a lightweight compound. Bigger than that and the meats start putting a load on the motor, which could hurt the transmission some.

BryaN