I had an episode on takeoff last week of reduced power. RPM stayed at 2450 but rate of climb dropped from 650 to 400fpm. Thought it was carb ice and pulled the heat.. Once at pattern altitude all seemed normal. Back on ground at mag check and full static runup all seemed good. But the next day after again a normal run up takeoff was only 200 to 400 fpm with passanger aboard.. Got her down fast..Mechanic said it is probably a sticky valve?? The Cont 90's will all have that problem sometime or another ..Marvel Oil and TCP have both been mentioned. Annual is this month and will not fly till this is cleared up..Any feedback would be appreciated..Have 1894 hrs on her so a top does not seem resonable ..but Madduck wants BIG $$$$$$$$..Could use the voices of experience ..
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