What are the things that could damage a glow engine, or shorten its life, and also symptoms that would show that the damage has already taken place. For starters, here is what I know :
Things that might damage :
1. Running to lean ( how much and how long ? )
2. Too less oil content
Signs of damage :
1. Lack of compression ( most obvious )
2. Starting problems
3. Sluggish throttle performance ?
Please add to the list..