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Message: [QUOTE="blic, post: 618343, member: 17080"] The bike stalls when twisting the throttle fast from idle to 3/4 or full throttle. Gear in neutral or in any gear. No matter if the bike is warm or cold. And I haven´t touch the engine before this started, it just happened. After it has stall in this way I can´t start it up in first kick, that it usually takes. In second kick it will fire up. The old sparkplug was black and sooty. I have inspected it before the problem started and then it was gold/brown as it should be. What I have done: Put in a new sparkplug. Cleaned the carb. with air pressure. Raised the needle jet one step, no difference so I put it back as it was before. Tested without air filter in it (just for some seconds), to see if it was clogged. Raised the idle, didn´t helped. Played with air screw, didn´t helped. So still the problem is there. Jetting: 175 main, 65 pilot, needle in 3th(from up). Air screw 1 3/4 out. Please help me out! [/QUOTE]