I have CD 70 dream in very good condition. Everything original and never faced problem before. 10 thousand kms running. I am facing a problem. My bike gives me 10km speed per gear due to which it goes to max 40 kms in 4th gear. After that, the engine gets too heavy and vibrates too much as well as engine starts screaming when i throttle. I went to mechanic. He changed my clutch plates (as they were worn out) and did tuning. But the problem is still there. Does anybldy have idea?