Funny, this last weekend I too was replacing the fuel lines inside my tank. No issues with rust, in fact my tank looked spotless. But I just turned 53K miles and the service schedule calls for replacement of the fuel filter and lines at 50K miles. It's about $200 in parts to go OEM, but I went Drag Specialties and only spent about $55 with my employee discount, retail would have been about $70-$75. Only difference was the Drag check valve line was about 3-4 inches shorter than stock. Not a big issue and still got it to work fine.
Was still chasing a misfire that was progressively getting worse, so also cleaned the crank position sensor while I was in there. Actually replaced the temp sensor the previous weekend.
Then as I was buttoning her up and about to put the seat back on I checked the battery terminals...... They were both loose! DOH!!!
For the last 8 years I've been working in the automotive and power sports industries and constantly preaching to check the battery terminals. "How about you practice what you preach, Scottie!?"
Anyway, the bike has been running fantastic all week. BUT, the temps are dropping into the 40's and 50's so now she's getting thirsty and has a slight hesitation off of idle. So, going to go into the map and add 3 clicks of fuel at 5% throttle and 1 click across the board, and maybe 2 clicks at 100% throttle. Just about ready for an oil change too, and will probably do the primary fluid with it, and go in and replace the primary chain tensioner shoe. Also thinking of changing the battery terminal bolts to 8mm head flange bolts so I can actually get a ratchet wrench on them, and a drop of Loctite so they don't come loose again.