Originally Posted by res289
hi guys,
i do my motor break-in using the WOT method. but now after going thru 10 tanks of fuel (i'm using 25% nitro-already added 0.1mm shim), i can feel my motor compression a bit loose compare to my friend (using OS TZ-5ports-same break-in method, same fuel). i'm wondering whether is this normal?
10 Tanks at WOT?

Most you might need to do is 3 or 4.... the rest needs to be done at the track, leaning the engine on each tank.
Probably with 10 tanks, your engine is completely broken-in and a little shot... lean it and see how goes, a low pinch engine doesn't means low performance... try and see.