Bruno:

Here is the engine that I am running:
http://www2.towerhobbies.com/cgi-bin...&I=LXGGP7&P=ML item 11880. I am using the stock collet with two washers on the stock shaft then the flywheel. I am also using the fiber disk brake with no problems. Here is the washer that I am using:

http://www2.towerhobbies.com/cgi-bin...99&FVPROFIL=++ part Z699

I am also using the stock 12t clutch bell and spindle bearings.


ejmovies:

Try sleeving the brake shaft with some tubing, metal or fuel tubing, until it engages as you like. On mine I left the fuel tube on because I liked how it made the brakes work. Just an Idea.