Got this engine for a trainer for my dad. Didn't want the engine to be to much so i settled with the ST 40. I was sceptical but am very surprised. Break-in went smoothly. Idle was rock solid and transition was great. Leaned her out to just under peak and i was shocked [X(] at the rpms reading. 13,500 turning a 10-6 prop. Is that to much, should i move up to a 11-6. Was expecting like 12,000 but 13,500.
Thanks
Cameron