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Scratches on engine casing

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Johanna
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Joined: 21 Jul 2018
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PostPosted: 17:08 - 13 Jan 2021    Post subject: Scratches on engine casing Reply with quote

I recently bought a second hand bike, 2000 miles on the clock. Looked great in the shop.
Now I've washed it a few times I'm beginning to see some very minor telltale scratches on the engine casing. So the previous owner had a little accident and it was covered up.
I'm fine with this. I'll just tidy it up and protect the bike myself as I intend to keep it long term.
How am I best off protecting the engine so it doesn't corrode at the scratches? I ride all year round so it's going to get salt and stuff in it. I apply bike protectant to the bike but is there more I can do at this specific location?
I assume if I do anything cosmetic to cover up the scratches they will reappear when I clean the bike next time. I mean - if it was possible to hide them permanently then they would already have done it, right?
The main thing I want is to keep the bike in as good condition as possible for as long as possible.
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oilyrag
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Joined: 07 Oct 2020
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PostPosted: 18:19 - 13 Jan 2021    Post subject: Reply with quote

Can you put up a picture of the scratch?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 13:06 - 14 Jan 2021    Post subject: Reply with quote

A common dealer trick (car and bike) is to cover up minor scratches in black painted parts with felt-tip marker pen.

So I wouldn't assume any damage had been repaired properly. Quite the opposite, I would assume it had been covered up using the minimum necessary effort so you don't notice it in the showroom.
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jeffyjeff
Trackday Trickster



Joined: 02 May 2020
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PostPosted: 15:09 - 14 Jan 2021    Post subject: Reply with quote

Is it an aluminum engine casing? Are these minor scratches, or is it road rash? if you are so inclined, you can smooth the damage with sandpaper, gradually moving to wet-dry and finishing with rubbing compound and polishing compound. I have finished some pretty ugly rash in both aluminum and plastic using patience and elbow grease. Might never look OE to a trained eye, but you can get pretty damn close.
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Johanna
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Joined: 21 Jul 2018
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PostPosted: 15:14 - 14 Jan 2021    Post subject: Reply with quote

It's small, but if I can clean it up and protect it sooner rather than later I'd be happy.
https://i.postimg.cc/XNsN3fWV/20210114-150228.jpg
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 15:23 - 14 Jan 2021    Post subject: Reply with quote

Johanna wrote:
It's small, but if I can clean it up and protect it sooner rather than later I'd be happy.
https://i.postimg.cc/XNsN3fWV/20210114-150228.jpg

You won't be able to easily match the finish. If you really want to do something about it, clean it most carefully with petrol or another solvent, and touch the spots in with an alloy paint touch-up stick (pen, brush) kit.

The other option is to spray the lot, but that's more involved.
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rpsmith79
Could Be A Chat Bot



Joined: 31 Jan 2017
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PostPosted: 15:26 - 14 Jan 2021    Post subject: Reply with quote

The other option (if available) is to buy some engine covers/protectors (R&G and the like)

Then you can apply whatever touch up/protectant spray, and then cover the whole thing with the engine covers
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Johanna
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Joined: 21 Jul 2018
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PostPosted: 15:34 - 14 Jan 2021    Post subject: Reply with quote

rpsmith79 wrote:
The other option (if available) is to buy some engine covers/protectors (R&G and the like)

Then you can apply whatever touch up/protectant spray, and then cover the whole thing with the engine covers

I like the covers idea, especially since my previous bike was dragged on its side off the road after an attempted theft. I'm still conscious of wanting to protect the new bike!
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steve the grease
Spanner Monkey



Joined: 26 Jan 2018
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PostPosted: 16:36 - 14 Jan 2021    Post subject: Reply with quote

Theres an aerosol called 5 wheel silver, the idea being that there is enough to paint , or at least touch up 5 wheels. It can give quite a good finish on engine casings, it's quite easy to spray ( do a test piece first) and then you could wipe the excess off leaving the paint in the scratch. Maybe leave it till it warms up a bit or it will bloom (go all white) because of all the damp in the air.
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 06:09 - 15 Jan 2021    Post subject: Reply with quote

The Old Simoniz wheel silver used to be an almost perfect match for Honda silver they used on engines and frames. the new stuff not so much.

Those are not 'accident' scratches. All that's happened there is the bike has gone over whilst stationary.
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