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Hi everyone, hope you’re all doing ok in this crazy time. I’m looking for advice on taking care of my Bonneville T120 engine casing. It has some white discoloration and I’m wondering what I can do to treat it. Any advice would be appreciated.

Thank you!
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I'd be concerned about what it is. Was it worse than this and you have cleaned most of it off? Do you have any coolant leaks anywhere, blowing back?
 

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Wow. What detergent do you use? Based on the pooling marks on the painted fins it would suggest it's some residue in the detergent or even water, rather than corrosion. Have you got hard water?
 

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Thanks for the reply Nick, the white discoloration was there when I bought the bike so I don’t think it’s related to my detergent. I blow dry and microfiber the bike after a wash to prevent pooling.
 

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In that case I think if you can get it off with mechanical means it should stay off. Gentle green scourer with water for the alloy and brass toothbrush for the bolts.
 

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Cheers Hugh.
Good luck to us all.
 

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Agree with Nick that apart from a bit on the edge of the fins and the bolt heads most of that looks like residue from chemicals (cleaning or otherwise) , maybe when the engine was hot.
you haven't been using specialist motorcycle cleaners like muc-off have you?
That stuff leaves a nasty residue if the engine is even slightly warm.
Maybe try WD-40 with a stiff brush or toothbrush, I usually give mine a wipe over with WD or gt50 after cleaning to give them a darker more even finish.
Clean up the edge of the fins with very fine wet and dry on a flat block and then protect with acf-50.
 
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