My apologies to armody and others for hijacking the other thread. Just wanted to nkon one last thing-

I have just washed (cleaned by dipping in plain alcohol for a couple of days) a very old 55ax. This specific engine has a scuffed piston but the liner seems to be OK. It was out of use for 4-5 months for the same reason. Have got some debris in the alcohol and a slight brown color. But the top of the piston has remained brown in color. The sides are all clear now. The bearings are slightly rusted but they seem to roll ok, no problems earlier with them either, just dead-stick after dead-stick even with this engine which could be due to other reasons. I stopped using it after it crashed a Reactor 46 but plan to use it now on a US40+ kit.

Now having washed the thing, I am going to re-assemble. Just wanted to know if the piston top color is natural or should I keep it immersed for a few more days. I have been mostly using plain castor on this engine with a bit of nitro

I am posting images of the top of the piston, side, head and liner. You can see the scuffing of the piston side very clearly, but trust me it is a lot less bad than it looks. On the liner also there is a bit . Dont think you can see in the pic and it is not seen very easily by eye either

Ameyam