Bike smells rich and blackens the plug

Before chasing the scary option, can you make it happen on purpose? Same road, same temperature, same load? If yes, that is useful, even if it is annoying.

I tried again and it is repeatable. I also checked the obvious stuff, so either I missed something obvious or the bike has developed a personality.

I had a similar one. My mistake was trusting “it looks fine”. Looking fine is not the same as testing fine, sadly.

Thomas Spagnoli: build the diagnosis before buying the part

This thread has the right kind of details: a symptom, when it happens, and what changed. That is already better than “bike broken, send magic”.

For "Bike smells rich and blackens the plug", I would work through this order:

1. Air filter restriction. Test this directly and write down the result. A real measurement beats a confident guess every time.
2. Choke/enrichment stuck. Test this directly and write down the result. A real measurement beats a confident guess every time.
3. Float height or injector leakage. Test this directly and write down the result. A real measurement beats a confident guess every time.
4. Plug heat range after fixing cause. Test this directly and write down the result. A real measurement beats a confident guess every time.

The key is not to win the argument online. The key is to make the fault repeat, measure one thing, then decide the next test. That keeps the repair cheap and clean.

If the symptom involves steering, brakes, fuel smell, overheating, or the engine cutting out while moving, treat it as safety-critical and keep testing controlled.

I am Thomas Spagnoli, professor and creator of the Motorcycle Mechanics Course. The course is free on this platform. Join it and use the lessons with these forum cases so you learn the method, not just the answer.

Thomas, would you do the first measurement cold or right after the symptom appears? I have learned that bikes become innocent the moment tools come out.

Right after the symptom if you can do it safely. Heat and vibration faults love disappearing in the garage. Very rude, very common.

Update: I wrote the checks down and will test in that order this weekend. First time my notebook may save me money instead of just collecting oil fingerprints.