For the 1986 MR2 24 hours of lemons car we prepped, I did a lot of research on weak points of the 4AGE engine in the car. I decided that one of the biggest problems was oiling, both slosh in the oil pan as well as pooling in the head. Oil temperature is also always an issue. I decided to whip up a custom deep oil pan with internal swinging baffles.
I have a 2008 Tomos Streetmate moped. Great for getting around town. Like many mopeds, the tail light (and brake light) run off the unregulated voltage coming out of the alternator. This allows the lights to run even when the bike is idling (~9V), but also means that on high speed downhills the light could be seeing up to 20V. Since automotive light bulbs are designed for ~14V, it means the tail light blows out all the time. This is bad since when you are riding it is impossible to know and not having a light will make it a lot easier to get hit at night. The LED will not only be much brighter but will come on faster (~100mS) which gives other drivers just a tad more time to react before rear ending me!