1. empty fuel-tank
2. remove that tank-cap using hex/allen keys
3. cover the tank mouth with several wide cello tape in criss-cross pattern (to prevent dust from entering tank)
3. clean both cap and tank mouth area clearly; perhaps use fine emery.
4. paint it properly (black enamel, paint thinner), apply double coat.
5. let it dry and refit tank cap after cleaning it too.





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