hello my name IS CALVIN IM TRYING TO FIGURE OUT WHATS GOING ON WITH MY 2005 TOMOS ARROW MOPED ITS MAKEING THIS RATTLEING NOISE INSIDE THE ENGINE IT OVERTAKES THE ACTUAL ENGINE SOUND THE BIKE WILL NOT RUN UNLESS YOU HAVE THE THROTTLE TURNRED UP AND KEEP REVEING IT BUT IF YOU STOP THE BIKE DIES THE LEFT COVER OF MY BIKE WAS CHANGED BECAUSE I HAD A PROBLEM WITH THE OIL PUMP IT FAILD AND OIL WAS EVERYWARE I HAVE IN MIND TO CHANGE BACK TO THE ORIGINAL ENGINE CASE