Originally Posted by
stearman70
There is no way to put the engine parts together badly. The problem was presented yesterday on the airfield. In this week I will try to correct the fault in my workshop. I will let you know of the results. Thank you for your information.
Maybe the engine was running well because the piston to cylinder sleeve seal was good from old oil. You cleaning the piston and sleeve may have reduce the compression. Check the idle screw adjustment first and hopefully you can get the idle back. Otherwise compression is the biggest issue regarding a poor idle.