Originally Posted by J. Kłapacz

Hi,

I am new in nitro, one engine I use for races successfully. Recently I start break in my second new Picco torque edox .12 and here's the question, after about 0.8l of fuel on the box and last 2 tanks gently driving, I checked the engine. There are small scratches, one quite clearly visible, what could have caused this and whether it will affect performance. Obviously, the engine was heated to around 90 degrees celsius with each start, I added Castor oil to the fuel, I looked at the engine before starting it for any dirt/filings from machining, fresh air filter and engine was very very rich and still heating to 90-100 degrees. If such scratches are normal I would like to avoid it.