What does a hotter plug mean?

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Tags

1. #means
2. #plugs
3. #engines
4. #range
5. #power
6. #mowers
7. #large
8. #reach
9. #typically
10. #temperature
11. #easily
12. #varies
13. #generally
14. #hence
15. #produce
16. #spark
17. #amount
18. #optimal
19. #operating