I also had issue with sticking valves on my 169. I was able to determine it was the valves sticking as after it quit, I would try to restart and the engine would spin over very easy as the valve or valves were stuck open. After about 10 mins it would cool and then start again with proper compression. I tried the MMO and it has helped. I now add it to my gas when I fill up. One day I need to take the engine out and ream the valve guide and also remove the balance gears before they vent my block. So much to do, so little time.
|