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Update on low power problem As you may recall, my C-75 is not reaching static RPM after the following work: cylinder 1 was removed and reinstalled to replace a helicoil, installed a new ignition harness, 5 new plugs, a new magneto gear and a new impulse coupling. RPM maxes out around 1800 RPM (sometimes higher, sometimes lower)and the engine gets a little rough. If I pull the mixture full out (lean), RPMs increase about 100 RPM, indicating the engine is running rich. As the engine gets warmer, RPMs drop further. While troubleshooting this we have found / done the following: a. primer is not leaking b. intake gasket on cyl 1 is in place and not obstructing air intake c. mixture plates have been cleaned several times d. Spark plugs were tested and cleaned e. carb heat box has been inspected for proper operation f. Mixture, carb heat, and throttle control travel and operation are fine g. fuel flow from header tank to carb is unrestricted h. Magneto timing was checked like 3 times. i. Compression is good on all 4 cylinders. j. throttle cable is not slipping k. replaced air filter You have read most of that in my previous postings. What follows is an update. 1. Installed the carburetor after a second A&P disassembled and cleaned it. Same problem. 2. Borrowed a good spare carburetor from yet a third A&P, installed it. Same problem. 3. Opened Cylinder 1 valve cover and switched the pushrods around. Same problem. As hard to believe as it is, I think we can rule out the carburetor. My A&P gave up and told me to contact the third A&P and have him officially take my case. However, the third A&P is in another airport... Not like I can tow my plane there... All that's left in the Contiental troubleshooting list is: scored valve stems, warped valves, worn cylinders, pistons and/or pistion rings, worn cam lobe... I will do whatever the third A&P tells me to do, but I will also appreciate any more ideas from the Ercoupe group. Regards Eliacim Cortes -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
