ENGINE RUNNING TOO RICH
Hi,
I recently got my bike serviced, and I noticed a few problems with the running of the engine:
1. The exhaust seems smokier than usual, I could be mistaken here.
2. My average seems to have dropped down from ~28 to ~25kmpl. (over fairly similar riding)
3. It feels rougher at the top end.. around 7500+rpm
The bike's done 23k km. Could it be the age of the engine? Could I be doing something wrong? How to test/modify fuel-air ratio?
//PS: On certain occasions it seems to really run really really smoothly, I'll have a better look at whether that happens when it's cold or hot


Both dates make for an awesome new year 

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