Need Help Over Here, Please.

I have this problem with my MX, here's the history.



I changed my stock carb to Keihin Thailand PE 28mm,

open carb, and matched the jettings fit for my set up, no problems.

Used it for a 200+ km ride, smooth-sailing, easily hitting 120kph,

but a noticable increase in fuel consumption.



Then maybe after 2 weeks or so, my MX starts to smoke on the exhausts.

I changed oil (Shell Ultra) and oil filter (OEM Yamaha), still smoking.

I checked the sparkplug because along side...



Need Help Over Here, Please.



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