80 mm, P.C.D. On introduction, the TBO was only 600 hours, which was double that of previous Rotax engines but far short of existing engines of comparable size and power. Rotax Engine Rebuilding Videos Here you can view the cookie settings of various tools used on this domain and its subdomains. var X_months = new Array('January','February','March','April','May','June','July','August','September','October','November','December');