Stained aluminum

yzcrkxrm
Profile picture for user yzcrkxrm
Posts
31
Joined
10/13/2018
Location
Beverly Hills, CA US
yzcrkxrm
Edited Date/Time 4/26/2019 11:05am



Posted this in old school section but thinking it's more appropriate here. Any idea if this is fixable without polishing? Just showed up out of nowhere. Tried bronze wool with some wd-40 but it's not removing it.
|
kb228
Profile picture for user kb228
Posts
6161
Joined
1/31/2018
Location
Mansfield, OH US
kb228 4/22/2019 7:34am
4/22/2019 7:34am
Try mag 1 wheel cleaner and red scotch brite. The mag 1 is an etcher. It takes off a super thin layer along with dirt.
yzcrkxrm
Profile picture for user yzcrkxrm
Posts
31
Joined
10/13/2018
Location
Beverly Hills, CA US
yzcrkxrm 4/22/2019 7:40am
4/22/2019 7:40am
I don't think it's dirt. It's like a stain in the aluminum. I'll give it a try on a small area. Thanks
yzcrkxrm
Profile picture for user yzcrkxrm
Posts
31
Joined
10/13/2018
Location
Beverly Hills, CA US
yzcrkxrm 4/22/2019 9:56am
4/22/2019 9:56am
Doesn't that remove the clear coat? I don't want a polished frame nor do I want to disassemble the whole bike. Just trying to figure out what it is and how to remove it short of sanding the whole thing down.

The Shop

See All »
captmoto
Profile picture for user captmoto
Posts
5140
Joined
4/22/2009
Location
Rancho Cucamonga, CA US
captmoto 4/22/2019 6:31pm
4/22/2019 6:31pm
If it is clear coated then the staining is under the clear coat. Clear coat resto means removing, cleaning and recoating. Frames aren't clear coated. Honda recommends a red scotchbrite to clean up the frame. What part is that?
yzcrkxrm
Profile picture for user yzcrkxrm
Posts
31
Joined
10/13/2018
Location
Beverly Hills, CA US
yzcrkxrm 4/22/2019 6:41pm
4/22/2019 6:41pm
That picture is the swingarm on a 19' 450 Yamaha.
bkillgore
Profile picture for user bkillgore
Posts
326
Joined
3/24/2016
Location
CA US
bkillgore 4/25/2019 11:56pm
4/25/2019 11:56pm
yzcrkxrm wrote:
That picture is the swingarm on a 19' 450 Yamaha.
The swingarm on that bike isn’t clear coated which is why it’s “stained”. You had some hard dirt on there and it etched the aluminum. All you need is some simple green and a scotch bright pad and it’ll come out. I have to do it on my 18 yz450 every other ride due to one of the tracks local has some acidic like dirt.
1
AJ565
Profile picture for user AJ565
Posts
2079
Joined
3/12/2012
Location
San Antonio, TX US
AJ565 4/26/2019 9:20am
4/26/2019 9:20am
Thats not a stain, its corrosion.
yzcrkxrm
Profile picture for user yzcrkxrm
Posts
31
Joined
10/13/2018
Location
Beverly Hills, CA US
yzcrkxrm 4/26/2019 9:24am
4/26/2019 9:24am
Bike is cleaned after every ride. I don't let dirt sit on it overnight. Could it be defective from Yamaha?
captmoto
Profile picture for user captmoto
Posts
5140
Joined
4/22/2009
Location
Rancho Cucamonga, CA US
captmoto 4/26/2019 10:42am
4/26/2019 10:42am
It's not defective, it's just stained.
yzcrkxrm
Profile picture for user yzcrkxrm
Posts
31
Joined
10/13/2018
Location
Beverly Hills, CA US
yzcrkxrm 4/26/2019 11:05am
4/26/2019 11:05am
I buffed it again with the bronze wool and it's not as bad but I can still see it a little. I'll probably just leave it at this point and put away the microscope. Ha!
Thanks everyone for the assistance.
1
AJ565
Profile picture for user AJ565
Posts
2079
Joined
3/12/2012
Location
San Antonio, TX US
AJ565 4/26/2019 2:13pm
4/26/2019 2:13pm
yzcrkxrm wrote:
Bike is cleaned after every ride. I don't let dirt sit on it overnight. Could it be defective from Yamaha?
Doesn't matter, raw aluminum can corrode from moisture in the air.
Tryhard
Profile picture for user Tryhard
Posts
405
Joined
6/6/2017
Location
VA US
Tryhard 4/27/2019 7:11am
4/27/2019 7:11am
yzcrkxrm wrote:
Bike is cleaned after every ride. I don't let dirt sit on it overnight. Could it be defective from Yamaha?
AJ565 wrote:
Doesn't matter, raw aluminum can corrode from moisture in the air.
Yeah , this is totally aluminum oxide corrosion . Which is aluminum reaction to the atmosphere . Which cannot be avoided . Nothing serious jut use some aluminum cleaner and some scotch brite . You can;t really hurt it ....
bf884
Profile picture for user bf884
Posts
509
Joined
1/11/2016
Location
Belle Chasse, LA US
bf884 4/27/2019 12:53pm
4/27/2019 12:53pm
Brass wire wheel on a drill or grinder.

Post a reply to: Stained aluminum