Hello guys, maybe you will be able to help me. I own Yamaha SR125 '2000. Engine starts no problem, working smooth but.... When i accelerate I can feel vibration on whole bike but probably originated from the engine. When hand off of the throttle vibrations get lower. I feel it especially on low rpm when on higher gears. I checked it with the mechanic, I thought it maybe steering head bearings or wheel bearings but mechanic said there is a little play on head but nothing major. Wheel bearings are ok. He said bike is burning oil (but no blue smoke yet). Front tyre need to be replaced because is worn uneven, but i don't think that is the main problem. So what you guys think it can be?? Worn cylinder / piston?? What can be a possible source of this vibration? Chain is visible in the window so it's in usable range, not to loose i think.