My wife and I took a short ride around skyline mountain. We stopped going down the mountain. She was looking for rocks, I know, well i left the trike running while I waited on her. A knocking started off and on. It was coming from my clutch area. I'm think they only added 32 oz when they did the service. Or theres a clutch problem just starting to show itself. I noticed when I first got it I would at times feel the compersator making noise. Would not take off smothelly. I'm changing the fluid with the proper amount tomorrow to see if it helps.