My bike takes 3,22l/100km. It used to be 2.75. And the oil, even though I change it more often than once every 1000km is always black. I got the smaller sprocket this saturday, new chain, and new horn switch. It's nice to see on taobao, that most of the parts are cheaper than 100y. Sometimes much cheaper.
I tried to clean the air filter. I've found it, but it's not so easy to take it out. Mechanic confirmed I will have to remove the silencer to do that. Is it a big deal? He said I can do that on my own. I got the user manual finally, it says the air filter should be cleaned after first 1000km and then each 4000km. Didn't do that yet. Someone wrote in internet that how often the filter should be cleaned depends on how clean is the air. So here - very unclean. He also said in the dirt bike after riding on the track he would clean it every time.
@Fahni: the tubes are waiting for you.