Back ground, 0-235 Lyc. fixed pitch, 2,500rpm cruise, rpm quickly drops about 25 to 50rpm, takes about 10 to 15 seconds to recover to cruise rpm. Doesn't, at this point, do it right away, takes about 30 minutes of flight for it to show up. Mag check is good with 75 to 125 rpm drop for both mags. Carb heat does what it's supposed too, drops the rpm about 125 rpm and rpm's recover when you push carb heat off but it will surge again in a few minutes. Time between surges varies between a couple of minutes to maybe 5 minutes. This just started Sunday on a breakfast run.
Went up last night circling the airport and she started in again at about 30 minutes of flight time, again at cruise of 2,500rpm. Last night no leaning as Sunday I was leaned out a bit but no change there either as I picked a nice green pasture before I touched the mixture control! Nothing serious, yet! But sure don't feel warm and fuzzy leaving the airport pattern.
Went up last night circling the airport and she started in again at about 30 minutes of flight time, again at cruise of 2,500rpm. Last night no leaning as Sunday I was leaned out a bit but no change there either as I picked a nice green pasture before I touched the mixture control! Nothing serious, yet! But sure don't feel warm and fuzzy leaving the airport pattern.
