Tightened the plugs up by the recommended amount? (need to be tightened more than a re-used plug).
Installed the leads/covers on the plugs the right way round?
Anything else changed? Curvy or pointy? Had a look for any leaks? (tricky as the fuel evaporates fast). Doies the bike smell of fuel only after it's been running and not when it's been sitting for a while?
Sometimes bikes just smell of oil and fuel, especially on warmer days. mmm. Not many of them in the UK though.
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