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Stained engine cases

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Yesterday was my first ride that included a lot of muddy water crossings (nasty red clay) because it had just rained fairly heavy. I took out the power washer this morning and was surprised that the stains on the engine didn't come off. I then tried washing them by hand and they still don't come off. The rest of the bike came clean with no problems, but it appears that the stains were baked on and don't want to go away. I sprayed them with WD-40 (works to get tar off, so thought that might work) and it took a little bit off, but still lots left. Tried contact cleaner on a couple of spots and rubbed hard, and again a slight improvement, but still very visible stains.

Has anyone else experienced this and if so, how did you clean the engine?

Cheers,

Mac

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I got em on my exhaust header but never my engine case. But you were saying that you washed your bike the next day after riding??? Because I always wash my bike the same day as riding even if it is dark and freezing. But, ohh well it is just a trail bike, and besides it not looking "good" it isn't like you are losing power.

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If all else fails, Keep ridin, they'll come off. Dirt is like sand paper.

I've never really had a problem, but whenever I encounter something like that, I use kerosene, then a followup of dawn dishwashing soap. Most of the times I just ride it out.

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I normally wash right after a ride, but this time I didn't. All the mud especially on the engine cases, was thoroughly dried by the time I got home, so I thought it wouldn't make any difference. From the way it came off everything else but the engine, I figured it had to be because of the heat drying the mud.

I'll try the kerosene next, but if that doesn't work, then it will stay like that. No dirt bike can stay new-looking for long anyway...

Cheers,

Mac

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I have some of those stains too. Went to Durham Town Planatation in Georgia and that red clay left more stains. Kerosene huh :)

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As I remember there was a product sold at Kragen Auto Parts Stores (might be another name but the same in your neck of the woods) to clean automobile alloy wheels. I don't recall the brand name of the product but it was sold in a couple of different formulas, A,B and I think C. One was for bare or raw aluminum/alloy, the others are for anodized,coated or painted aluminum/alloy wheels. As I recall the active ingredient was phosphoric acid. You had to make sure that you chose the right one or it would remove, strip or "fog" the coating. On raw alloy it would remove all of the oxidation and stains in one application and make the surface look like new!

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I went out, dug around my shop and found the Mfg. The cleaner that I have had around for years was made by Eagle One. If you check their website

http://www.eagleone.com/_products/index_whe.asp they have reformulated it as "acid free" but they still have different formulas for raw, coated and anodized alloys as before. I can't vouch for how this new formula works but it may be worth looking into....Karl

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I have not used the above mentioned cleaner, but I do know of a couple of guys that used Castrol's cleaning formula on their Honda CR's and the alloy turned black. Be careful with what ever you use !!

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