I have a Grubee 66 cc motor bought new June 2011 that I ran for 1600 miles before it died. Starting at around 1200 miles it began to make a rattling noise that gradually got worse. This was present at idle or running and it was not piston slap. When it died it sounded like something gave way. I can manually turn the motor over and it just sounds strange while not cranking. I've read countless posts and determined that bearing failure is common and that the upper conrad bearing is a likely culprit. The work I've done on these motors has been minor(replace magneto, clutch pads, clutch plate adjustment, clutch pin and bearing lubrication) but I want to try and replace these bearings. I got the bearings recommended in a post so I'm ready. The only problem is that I don't know where the "upper conrad" bearings are or if that is what they are really called. Can you give me an idea where to look and any other bearings I might see in case those need replacing? Thanks.