Greetings,

We are experiencing a 100-300 rpm reduction in power approx. 60 seconds after takeoff. It has happened during a straight climb or a climbing turn. It lasts for only about a second and it doesn’t happen every time, mostly on the first Climbout of the day, but it is very obvious when it happens. We just finished an annual where we cleaned and gapped plugs, cleaned the filter in the aux. fuel pump and replaced the air filter. Mags? Ignition harness? Accelerator pump? I see 2 other locations for the accelerator pump linkage to attach to but I’m not sure if that is an option. Our engine is an O-320 with an STC 160hp

Pat Hendren