Purchased a Whirlwind 2 blade GA prop and solved my low RPM issues, still only getting 70-75 mph (on Dynon and GPS) in cruise at 2600 RPM. Looking for someone in the Hannibal, Mo area that could offer assistance. We are the 3rd owner on this aircraft with 90+ hours on the airframe and engine but running out of ideas and $$$.

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you need to see 2750 rpm on climbout with the O-200 - if not then prop needs setting

but first check if the mags are timed at 28 deg  not the old AD setting of 24 degs  which looses about 5 hp

Darin, I've got a 750 with a C-90 & the Whirlwind prop. At 2600 rpm I'll be making around 95 mph or better, S&L solo. My own version of a power-check is to firewall it while S&L to see if I continue to make the same rpm, which with my prop setting is around 2660 rpm. I would make sure you are getting full power out of your 0-200 with a thorough engine checkout like Mr. Bonasara suggested by confirming your timing and verifying good compression before I'd do anything else.

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