For street riding, I'd recommend the Pirelli Sport Demons or the Bridgestone BT45. Both are great tires that seem to stick well.
The 120 width on the front is over the recommended size of the rim of the 250. The 140 rear is acceptable on the rim on the back.
I would go with the stock 110/130 sizes to preserve the handling characteristics of the bike. Why is it that you want to go to bigger tires?
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