Well I started my 180 yesterday for the first time since I have owned it and likely the first time in many years. It fired on 2 blades and ran great below 1200 rpm. Once the temps and pressures looked good I tried bringing it up to 1700 to do a mag check but never made it much past 1300 due to excessive roughness.
I did cycle the mags and on either rt or lt it would kill if I didn't switch back to both almost immediately. I have old slick mags and have no idea when they were last overhauled but I suspect it was more than 15 years ago as my plane has been dormant for more than that. I am getting it back to flying condition.
My hunch is mags for obvious reasons but I dont know a whole lot about them and thought I would ask. I don't know if it seems right that the engine would run fine at low rpms with bad mags but figure plenty of you will. I had someone mention that it could be a plugged jet in the carb. I don't think his is it as I know the last owner had the carb rebuilt in '03 and it has not had fuel through it since.
My engine is old and I am sure I will have addition issues with it with a rebuild most likely in the near future but I wanted to at least chase this issue before giving up.
And lastly... My data plate on the engine says O-470-K-R. Anyone know what the R means? I have had one guy say he thinks it is a K case with R jugs? It was a factory reman back in '65 and has 950 hrs on it.