Tank Rust Removal : Decided to go with the Vinegar method. Seems to be quite effective, cheap, and somewhat less dangerous than hydrochloric acid or other caustic chemicals.
More info on the method here: Remove rust from a gas tank
Basic steps :
- Empty tank
- Fill with vinegar / metal screws and shake to loosen the big rust chunks
- Let it soak 1-2 weeks
- Rinse with sodium bicarb to neutralize acid
- Rinse with fuel + 2-stroke premix to remove water, prevent flash rust
- Rinse with some fuel
- Fill it up with fresh fuel
Tank came off relatively easily. Unhooked the main fuel line and the vacuum line from the petcock, and one bolt in the center under the seat. Tank slides back and up, was sitting on two rubber holders. Rubber and under-tank padding in good shape.
Petcock came off easily, but as I suspected, totally gunked up, will need a good cleaning.
Gas tank ready to be filled with 15 liters of vinegar. I never bought such a huge amount of vinegar in my life!
Drained the tank, Old fuel came out very slowly. Emptied out the top hole while shaking, tons of rust flakes and gunk came out with the old gas. What a smell. Added in 8 big screws, 30 tiny screws and filled up about 1/3 with vinegar. Shook the vinegar / screw mix, then topped off the tank with vinegar and put the cap back on.
Now we wait and let the vinegar do the job.
BATTERY : I also took out the battery and it's in pretty bad shape. Will have to get a replacement.
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| Type : YB7BL-A |
AIR CLEANER : I checked out the air filter compartment as well. While there was no filter element in there, everything looks pretty clean.
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| Air filter box |
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