My son drove his water-cooled Suzuki Katana AY Bj.1998 first a friend home with it strongly the mountain went up (only 20 km/h). Then he drove on with a speed of 70 km/h (without tuning is not tinkered but original) reached. He heard a noise and then it went out. After that he stopped immediately. Even after repeated attempts it did not jump any more! But the engine turned! Now jump t she has on again but a very loud rattering, but then she also goes out again! What do you think that could be? Has just his driver’s license and it was the first ride! Thanks for your brain cream!