There's a Suzuki DL650 that haven't been started in six years. I'm slowly working to get it running again, and cleaning rust deposits out of the tank is the current goal. My hand is too big to fit in the hole so I made a thing.
this post was submitted on 06 Oct 2025
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Vinegar my friend just use vinegar white distilled vinegar 50/50 it with water. Pour maybe a quarter gallon of white vinegar in there and add another quarter gallon of water and shake it and let it sit and shake then let it sit then shake then let it sit and flip it around and shake it and let it sit until the rust dissolves then pour it all out give it a quick rinse and then pour baking soda and water in there to neutralize the vinegar otherwise it will flash rust shake it a couple of times and let it sit for a few minutes shake it and let it sit and then rinse it completely and you're golden.
That's pretty much what I did. 5L of 10% vinegar plus some water ate almost everything away. Now my problem is 11 pinholes and a leaking seam...
This is where JB weld and or soldering it up would be the order
I've also heard good reports about a supposed thin lacquer like coating that you can apply to the interior of the tank and then let that flash off and dry to help it seal it. But I have never personally used so I cannot actually State the effectiveness of any of those.