Hi mate, your fuel gauge seems to be working fine. They all lie in regard to a full tank reading. After filling up the will read full after riding for an hour then they drop very quickly to half a tank. The reading when it gets low is more accurate and as you say you have a fuel tap with reserve so you should never run out of fuel. More modern bikes that use a warning light are just as inaccurate. The tank is 4.2 gallons capacity. You seen to be having issues with the gear change, it may be that your chain is a little slack, they dont like that at all.

cop .. do youknow why i stopped you ? zzr rider yeah cozi let you

Both your head gaskets and valves are blown, 🌞 Sunshine😊any Harley is far too quick for you/very clever gloves😊lead additive to an unleaded engine is extremely millennial