hey i got a Cen Genesiscan i start this by saying that the manual does have inforation about the enigne run in, it comes seperate on anoher shet to the construction instructions, anyway just a few tips, do not pull the enigne when it is even slightly flooded as you will break the pull starter, also replace the throttle servo with a futaba as the stock servo is (out of no need) a high torque servo so the accuracy of it is very, very low, when tuning you will get better response from the truck should you have a better servo in. also if you insist on using the stock tranny then i suggest taking it apart and greasing the trigger as after repeated use i have found it tends to stick and take a second or two to return to zero, this an be anoying when tryin to smoke some little maxx or a savage, lol...anyway i spoke to a person from cen when they were advertising at my local halfords shop and thy said that yo ucan start to move it slowley after 4 tanks but you must have 6 tanks throuh befoe you can start to lean it out. over al i think the truck i realy good however i would say had the choice i would have gone for the savage truckzilla upgrade, as i have herd this is much better. anyway guys please don't flame me for this post !...lol...have fun!