Roach, yer 250 WILL run with a TRX310R....mine does! Literally dead even thru the gears to around 3/4 the way thru 5th gear. Where we were, the small hills down the right side of L.S. once you get thru the gate out of south camp, we ran into traffic n had to shutdown.....a buddy of mine here in OKC has CT on the side of his jug, I asked him about it, he told me it was a CT310 setup. After we ran, I felt REALLY good about my lil 250 with some Bartlett porting, Sheared Pipe, 39pwk, rad valve with a Uni filter!!