RE: GP290 vs. G260
The G260 will definetly outperform the CY290 and its more reliable. I'd forgot about the G270 but like Mcspanner said, its a great motor. Right now I think that Zen are the only ones that make a 4bolt so you cant get a 30.5 in a 4 bolt but trust me, I had a 27.2 and there wasnt a 30.5 that can outrun my Baja. I've actually changed to a G260 since then. And remember, a 30.5 still a CY motor.