Treat it gently as directed. My little ringed ST G.34's performance kept improving visibly over the first two hours or so. I kept the first 20 minutes of running down to about 2 minute runs though, and ran a very oily 75/25 FAI mix for the first couple of hours. Now its very happy on 80/20 FAI and screams. At about 7 hours running time, I'm still on the factory ST plug.

Unless that Evo's compression ratio is very low, it should run fine on a cheap zero-nitro FAI mix.