I`ve been spending my time in lockdown trying to get my 79 GS750 tidied up and back on the road after a long time sat in the garage. I stripped her right down and have rebuilt, not as well as I would have liked as plenty of time of course but a very limited budget. Anyway, the old exhaust was a 4 into 1 but of unknown make, possibly a Motad. It practically fell apart it was so rotten. So I had to bite the bullet and buy a new one, only one I could find for the bike was a Delkevic 4 into 1, which has a straight silencer on it. The bike started up great but I haven't been able to take it for a spin yet, so just warmed it up really. Noticed that the header pipes have started to turn that gold colour. I am not sure whether that is just because they are single skin, but suspect more likely it is running lean. Have to admit I have not replaced the intake rubbers or airbox rubbers, can`t afford to just now as apart from the exhaust had to buy new rear shocks, brake pistons and seals (haven't told the wife about those yet !) but will at a later date. So could be air leakage there although I have used plenty of sealant around the joints, weatherstripped the air box covers etc. As I said though, have not been able to take the bike out for a good run, only had the engine running on the drive and didn't rev more than about 1500rpm. I haven't touched the carbs yet other than cleaning, the pilot airscrews are out about 1 1/4 turns, Just wondering whether anyone else has the same exhaust fitted ?. Thinking maybe I need to lift the carb needles up a notch or two. Any advice or thoughts much appreciated.