I have been driving my used Keeway ry6 for about a year now (previous owner had cared for it well with professional experience). He has now about 12,000 km on the stand and had never caused problems until the winter. I had to go to work and so on… But in the time he had started to give in to the performance easily. Downhill everything is great, but on climbs he then got a little slower than usual. But he drove still well and showed no big problems. As soon as I let go of the gas, he went up again from “short before” to the stationary gas and ran normally. I gas again and he comes with me, but only for one meter and the whole thing repeats. Long story here, a lot of looking there, I saw that the air filter was separated from the carburetor. The hose didn’t get on, so I didn’t get on because of any money, completely provisional the connection g with tank tape restored. And in fact it ran again perfectly as normal! But after a week also that gave up, (what do you want to expect?) so new air filter ordered and now installed. Test drive made, SOFORT the same problem with the performance, although the air filter is sitting and also does not want to go off at all… So I removed the carburettor, disassembled, cleaned and and and, again installed (yes, all parts where they belong) and put it down but: if I give gas now in the stand (back wheel in the air), it fluctuates in seconds clockwise with the speed, always up, down, up, down… So it will not come in the same way with a test drive now, except it goes downhill. I read that the mixture is probably too fat with such a thing, so I set the corresponding screw, but even if it has turned in COMPLETT, still liquid petrol comes out of the exhaust… I am at the end of the nerves and this thing will cost me my job soon, as I have no other way to get to work. I ask for urgent help from experienced people!