I have an old bike with a Suntour Cyclone derailer on it which seems to be nothing but trouble. I have tried adjusting everything on it with little success. It seems to make noise no matter how much I trim it. When I get on the pedals hard I can here it making a sound like the chain is trying to jump gears. Lubrication does not affect the noise level. Im not sure what to do except just replace it.