I have a 2004 Cagiva Raptor 125 and for the last week it's been letting out smoke a bit too hard:
I have had the bike for a year and a half now. I did an engine rebuild as soon as I got it because the cylinder was all messed up (just like the piston, rings, etc) and used the same kind of oil during this period (Motul 2t 710).
It used to produce much smoke when the engine was cold but stop doing it after 1 minute of riding (and rarely producing visible "clouds" of smoke), but now it produces smoke even when hot. I rode it for 30 km yesterday and when I got home and put it in neutral it kept producing visible amounts of smoke when I was revving it. Also, it struggles to idle (only when hot). It starts up very easily when cold and idles just fine. Generally, it rides normal and I did not notice decreased performance.
The oil pump setting is normal.
What could be the problem? I really don't feel like it's the engine again since it starts up so nice and easy (and it idles well when cold). Also when the engine is already warmed up I need to give it a bit of gas in order to start it (i don't need to do this when the engine is cold).
I feel like the carburetor needs a bit of cleaning/ adjusting.