So im new here, and I've searched the forum and can't find anything related. And I know how y'all are in these forums, getting irritated at newcomers that don't search the forums first before posting a new topic. So. For starters, I just bought this thing 2 weeks ago. It's a 97 300ex that's apparently been bored over .30 and has a full hmf exhaust. And I'm pretty positive everything else is stock. Got it from some 16 year old who said he only had it for a month. Now. It ran great up until a few days ago. So. I just got done riding about 45 minutes ago. And noticed something weird. It started bogging real bad after sliding it around in my backyard around the bushes. The first time I noticed it bogging was when i stood it up, so I asked around and got the same answer from everyone. "The quads not meant to be 90 degrees up, so the float doesn't know what to do" now I've cleaned the carb, cleaned the Jets, cleaned the needle, ran carb cleaner through every crevice, compressed air, the whole 9. On a side note, idk if it's the timing chain or not, which I do assume it's a big possibility,, but wanted to get some genuine advice from other Honda owners. I've always owned Yamaha, but I've also always wanted a Honda. Just always been out of my price range. I hear clacking from somewhere in the motor, so I did the ol "stethescope" trick with a long extension and stick it to my ear. Nothing from the valves or anything from the top end. Took both covers off. Everhthing seems solid. But the lower I get in the motor, the more the noise gets louder. So I'm assuming it's either piston related or transmission related. It does leak oil from the oil filter housing but I keep oil in it so it's not low on lube juice. And it does change with pitch so it's definitely something moving. So I guess I'm asking for advice in both problems. Why am I bogging after just doing some little slides around bushes, and from donuts, and what would YOUR guess be as to what the noise is. I will post a video with the ex running so y'all can hear it better. Please help I'm a noobie here.