FXR 150's run on 91 petrol. If you run it on a higher octane, then you might wreck the spark plug.
Run on 91 and put in a new spark plug.
Your engine can't be getting hot after 4km. I ride 5km and majority of engine is easy to hold. Only area which isn't is where the spark does it thing.
Is your oil cooler damaged or blocked?
Is your oil cooler pipes to and from damaged?
How new is your spark plug?
How clean is your air filter?
Is your choke stuck?
If oil keeps it cool, then I'd get the oil pump tested for pressure and oil flow rate.
Your oil level should be near the top most mark beside the glass window. That's high. Middle mark is low and should be avoided. Bottom most mark I assume is "I need to buy a new engine now". Where's your oil level at?
90% of the time spent writing this post was spent thinking of something witty to say. It may have been wasted.
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