Agree with pekingduck and peterbaron, i would remove the allen bolts holding the filler assembly and remove it .
Then i would put something flat and good fitting over the holes in the bottom of the filler neck to stop any dust etc. contaminating the fuel.
Clean the dirt off the now exposed area around the filler neck with some cleaner solution.
Then clean lightly the loose rusty dust without removing the protective coating of the filler neck.
You could follow up with a small amount of "autosol" polishing compound to have a clean surface.
And smear a thin film of silicon grease ( or something similar which does not dissolve with fuel ) and repeat this over time to maintain a very light coating over the affected area.
also assemble the filler cap with some silicone grease on the mating surfaces and allen bolts threads to prevent more corrosion
It looks to me that condensation has build up under the fuel cap and worked its way down the affected area from being parked on the side-stand over time.
This tank should last the life of the motorcycle, nice pictures and welcome to the group, beware of salt spray on metal surfaces!
Max
Then i would put something flat and good fitting over the holes in the bottom of the filler neck to stop any dust etc. contaminating the fuel.
Clean the dirt off the now exposed area around the filler neck with some cleaner solution.
Then clean lightly the loose rusty dust without removing the protective coating of the filler neck.
You could follow up with a small amount of "autosol" polishing compound to have a clean surface.
And smear a thin film of silicon grease ( or something similar which does not dissolve with fuel ) and repeat this over time to maintain a very light coating over the affected area.
also assemble the filler cap with some silicone grease on the mating surfaces and allen bolts threads to prevent more corrosion
It looks to me that condensation has build up under the fuel cap and worked its way down the affected area from being parked on the side-stand over time.
This tank should last the life of the motorcycle, nice pictures and welcome to the group, beware of salt spray on metal surfaces!
Max