Originally Posted by blis

Marko, a lot of us ran Maxima at the worlds and it was fine, I liked it.

Depending on the weather, humid days can cause poor combustion, our engines are much cleaner running in Victoria than Brisbane.

Nitro engines need cleaning, the residual castor can look like rust, but more often the fact we pack O2 in the fuel makes it oxidising. Keep them well maintained (as you are) they dont have to be polish clean, but they do need the castor buildup removed regularly and stored free of methanol.

Your goal is to keep the bearings clean and prevent failure. Once a bearing goes, then everything starts going downhill.