ORIGINAL: tsyssa
Did you adjust the needle settings? When it was run here it was very humid and 50 degrees. What is your altitude?
Just ran the Mejzlik 18x6 on a new engine with 17 minutes running time....turned 9090 rpm for peoples reference on props. Its about 65 out today...180 Ft ASL.
Cool! My Evo26 after 9 Gallons turned the Mejzlik 18x6 8320 max on stock muffler..