I've ran 2-r at 32:1 as long as i've had my shee, and I've never had any problems. At 24:1 Yamaha will sell more oil and plugs, plus the engine won't fry, so of course they'll say 24:1 is best, but 32:1 is perfect for 2-r, I'm thinkin about switching to klotz though, i have a friend with a 99 shee that runs 50:1, it'd prolly be a little cheaper, what do you guys think?