Hey people i would like to share the story of my engine 0S MAX AX .46 which was in a very very bad condition .
A few year back i bought this engine i flew it once and then i just forgot about it , it was kept on the shelf for straight 6 years with no oil . A few days back i found my engine i tried spinning it and nothing happened it was fully gummed up with castor oil . The engine was in such a bad condition that the only color i could have seen was of the dried castor oil . I wanted to get this engine back to life and this is what i did .
1) I tried to open the head of the engine but the screws were very very tight i could not have opened them so , i kept the engine in kerosene oil for 3 straight days . ON the third day when i took it out i could have seen a lot of castor oil was gone but still the engine was not moving
2) after getting it out and drying it i tried to unscrew the nuts and voila it did . I in my life had seen nothing as dirty as the inside of this engine covered with castor oil , i could see the piston stuck to the combustion chamber . I then thought lets open the back plate and see what is it like in there , and it was as bad if not worse than the piston the connecting rod was struck with mass of dried up oil it was not a good experience for my nose and eyes
picture of the connecting rod
3) After seeing this i removed the head of the engine and baked the whole thing inside an oven for 10 mins . After it started to cool down i could have felt the engine moving a bit , but even this was not enough
4) I then took the engine and boiled it for 10 mins, this time around a lot of old oil was coming out of the engine i took it out and it still was not moving properly
5) I then soaked the engine for 30 mins in
denatured alchol and blow dried it with a hair blower the engine now was free
6) I brushed the engine with a mild tooth brush and cleaned the connecting road , piton , back plate with good quality ear buds (plastic sticks with cotton on them) i used a whole box to clean all the oil residue
7) Now that it was cleaned up it had great compression so i just oiled every thing with a small painting brush reaching into the bearing
8) At last i assembled every thing and this is how it looks now 
A video of the engine running -
https://www.youtube.com/watch?v=5394GU7nyYQ