I'm not sure what is going on here. I have looked at many if not all of the posts. I have an 80cc (OK, 67.89756443 for some of you) Grubee. I bought it on impulse. I'm not rich, but I have never really grown out of the "I want it now" stage. I saw someone with a motor on their bike and wanted one, so I bought it. My install, unlike many on here, went relatively smooth. But here is my problem. I'm hearing a serious metal on metal squeek coming from somewhere on my engine. At first I thought it was the clutch. Let me back up a second. When I first installed the engine, I was happy, it worked after about 5 times of trying to get it started. But it always seemed that the pedal performance sucked. It really seemed to be dragging. Then I found motoredbikes.com soon after, started reading as many posts as I could get though, and realized my clutch wasn't adjusted correctly and was dragging a little when I though it was just added chain drag/friction or whatever. After taking off the starboard cover (right if you are riding the bike), and adjusting the clutch per posted instructions, I got the clutch working correctly (this is also with adjusting the play in the clutch cable). But everytime I would go for a longer ride, say 10 or so miles, I would hear a very distinct grinding sound of metal on metal. It seemed that it was coming from the clutch/gear box. I would take off that starboard cover, take out the little screw, and adjust the star kind of nut counter-clockwise one notch, put the little screw back in, put the cover on and drive on. This seemed to take care of the problem, temporarily. Until recently. Now I almost always have that sound. Metal on metal sound. I'm not sure what to do. This engine has seemed pretty bomb-proof, yet I'm getting this very disturbing sound. I took off the clutch plate and rode the bike around a little with no engine running and the sound was still there. So It's not a piston thing, or a clutch thing. This seems to be a problem somewhere between the drive sprocket and the clutch. Maybe the axle that ties it all together? Anyone have this issue? I would like to fix it, but I have reached a point where I just have said f#ck it and started driving the thing. When it breaks I will buy a new one. I don't really mind, but I would rather not throw money away. Anyone have any ideas or hypothesis as to what is causing this sound? It does occur both while under pedal power and while under engine power. A little more under pedal power or coasting. Thanks to all who write back. I'm heading up to Kings Canyon to camp for the week, but I will be back around Thursday and will check to see if anyone has had the same issue. This clutch is starting reminding me of my ex-wife. Please don't ask me to use the SEARCH function. I've done that.