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Hey! I'm hoping the vast knowledge you guys share may be able to assist/help me. I will state now, mechanically, I'm really not the best (At least, on old school bikes ironically). I'm happy to get stuck in, and I learn very quickly, but my knowledge of motorbikes and fixing them as of the moment is rather lacklustre, hence me being here to ask a few questions! I do apologise for any stupid questions in advance (Just keen to learn more) I recently inherited a Suzuki GSX 1100 1980 ET from my Dad. He'd had it MOT'd about 8 years ago, put it in the garage and never used it since. We recently brought it out, took her up for repair where the head gasket was replaced, fork springs were too small so they were adjusted, a general overview/maintenance. The guy had the bike for a total of 30 work days (Not including weekends). Cost about £2k or so to all in all. He stripped the full top end and nothing nasty was found. MOT passed fine (Literally on Saturday) I rode her home Saturday, what a bloody ride. Absolutely in love. But, I noticed on my left foot there was oily residue which appeared to be leaking from the side cover. Feeling alongside the ridge, it was dry, then suddenly wet alongside the gasket there. (see picture) It seems like it's running down the various bolts there. Problem 1. I also noticed that once the engine had heated up enough, oil was dripping on the exhaust manifold from the head (causing smoke to appear because of how how the manifold was). (see pictures, with oil drip on the bolt itself) I was unsure whether this was due to the gunk not being cleared off from before and it leaking and the guy who had replaced it hadn't really cleaned the area around it. I've given this a wipe with a rag, but I'm still pretty sure I still see oil around the main nut here and/or feeling it, the consistency is that of new oil. But then, I'm really bloody unsure. On to the main issue. Yesterday, I put in the straight through baffle (My dad recommended I did) and didn't make any changes to anything else. Bike was running absolutely fine, no issues. Some guy cut me off, so I went to honk, realised how crappy it was and accidentally stalled the bike. No biggy. Went to re-start, and from that point onwards, the bike was 'boggy'. There's no other way I could describe it other than it felt 'laggy' - it didn't sound right, almost like it wasn't firing correctly. Accelerating took forever. The moment I came up to a roundabout and pulled the clutch in, she died on me. I tried to restart her, but no luck. Choke out etc. I tried starting her while accelerating, which worked, but then immediately died once then RPM hit idle (1-1.5k~). I was about a mile away, so managed to get her back to the garage, by constantly revving. Moment I pulled the clutch in, instantly died again. It was still consistently sounding, well, fucked. I tried starting her once she was at the garage, no dice. I let her cool for half an hour or so, tried once more with the choke out, started normally, didn't sound strange or anything at all. This morning, I whacked the other baffle back in (The original, non straight through one) - Started her, let her warm up. Was playing a bit when letting the choke in and dying, so let her warm up for longer than normal, pulled the choke in, no issues what so ever. Begin riding her, again, no issues. Get to a roundabout, pull the clutch in to kick down into first, instantly died, and then could no longer start her. Quite frankly, I'm really bloody lost. I'm trying to get hold of the mechanic that 'fixed' her for me initially, but during the meantime I was eager to get some other opinions/views. I'm happy to provide pictures/photos/further descriptions if needed. Thanks in advance! TLDR; 1.) Side cover? is leaking. 2.) Head gasket issue still happening? Oil appearing on head/dripping onto exhaust manifold. 3.) Loss of power once engine has been warmed up and accelerating. 4.) Bike dying with clutch pulled in once warmed up and riden for about 5~ minutes.