I've just aquired this '75 CB360 with 14k miles. It had been left sitting for a long time. At first she was running really lean. I rebuilt the carbs to find lots of gunk in the bowls. I soaked and scrubbed and carb cleaned and reassembled. Then it started right up and ran great. I put maybe 3 miles on her then took her to the gas station. Topped her off with premium and off I go....I didn't get out of the parking lot before she started making a noise like metal on metal at the frequency of RPM. I turned her off and bummed for about a minute. I tried to check the oil level again be couldn't get the cap off. I contemplated walking home to get the truck. I pushed her an heard the chain rubbing on the center stand and thought, could this have been the noise I heard? I decided it was worth the chance and started her up again. And no noise, thank GOD. I ran her around the neighborhood another 15 minutes and on a downhill near my house the noise came back. I pulled in the clutch and she stalled and I coasted into the driveway.