I made him go around a loop!
Okay, the trick is to have a long downhill stretch, so he picks up some speed, then start a bit of a shallow incline, to start your loop. The first uphill stretch of the loop should be kind of long, if it goes up too sharply, he'll fall off. Once you've got the line pretty much pointed straight up, make the rest of the loop small, so he won't have time to fall off the line. All curves should be as smooth as possible.
The only problem is, I can get him to go all the way around the loop, but when he gets to the bottom, and gets to where the line from the beginning of the loop crosses with the end of it, he crashes
This line worked perfectly:
Until he crashed at bottom of the loop, anyway.
If you make the end of your loop perfectly line up into the beginning of it, will he go around it twice?