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Old 08-23-2010, 10:36 PM   #1
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Default DO NOT PUT SPEED CRANKS IN WD40

Just a precaution, had my speed apart waiting on bearings and had all internal parts in a ziploc bag that i sprayed lightly with wd to keep moisture out. The silicone in the speed crank absorbed it all and ballooned outside normal dimensions! i have it airing out and seems to have swollen down to normal so justt be careful
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Old 08-23-2010, 10:44 PM   #2
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Absolutely, wd40 is a solvent. In the instructions is states to keep solvents away from the silicone. wd40 will also ruin the orings and glow plugs wd40 is mistakingly used as after run oil all the time

use marvel mystery oil in the future
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Old 08-23-2010, 10:49 PM   #3
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funny as i always use marvel for after run and such but simply am used to wd40 with all my other mechanical fields i figured it wouldnt hurt. guessed wrong
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Old 08-23-2010, 11:10 PM   #4
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Originally Posted by Tony Newland View Post
Absolutely, wd40 is a solvent. In the instructions is states to keep solvents away from the silicone. wd40 will also ruin the orings and glow plugs wd40 is mistakingly used as after run oil all the time

use marvel mystery oil in the future
X2 never use solvents on silicone filled cranks. Many engines have them these days. Keep them away from the solvents.
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Old 08-23-2010, 11:14 PM   #5
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Hey Tony (long time since we've spoke last!) I've tested most of these oils that people use for after run and I can tell you that when it comes to Marvel Mystery Oil, at least their Air Tool Oil it will do the same thing if you douse the engine and leave it in there for a while.
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Old 08-23-2010, 11:25 PM   #6
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Clockworks recommended to me a light singer sewing machine oil. I have been using that for about a year now when I need to use anything and filled crank or not have had no issues.
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Old 08-23-2010, 11:34 PM   #7
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We have been using a fuel with rust inhibitor in the fuel and always run the engines dry while warm at the end of a race meet and never in the last 5 years have we had to put and after run oil at all....


I have seen that happen as well the silicon expand and it was from washing in the internals in a wash trough then dried, its like the silicon absorbs the solvents like a kid with a lolly has to have it...lol
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Old 08-23-2010, 11:49 PM   #8
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Quote:
Originally Posted by Werks View Post
Hey Tony (long time since we've spoke last!) I've tested most of these oils that people use for after run and I can tell you that when it comes to Marvel Mystery Oil, at least their Air Tool Oil it will do the same thing if you douse the engine and leave it in there for a while.
Hey Ron, how are you?... ya been a while huh, worlds 08? your # the same? I'll hit ya up so we can chew the fat

I've always used the red stuff and had no issues
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Old 08-24-2010, 12:22 AM   #9
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Clockworks recommended to me a light singer sewing machine oil. I have been using that for about a year now when I need to use anything and filled crank or not have had no issues.
you mean that cheap stuff?

wow never thought about that
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Old 08-24-2010, 12:48 AM   #10
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Quote:
Originally Posted by blackbeardrollo View Post
Just a precaution, had my speed apart waiting on bearings and had all internal parts in a ziploc bag that i sprayed lightly with wd to keep moisture out. The silicone in the speed crank absorbed it all and ballooned outside normal dimensions! i have it airing out and seems to have swollen down to normal so justt be careful
i wouldnt reuse those orings...replace them...my best guess the hardness has changed and ther are probably going to be very brittle

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Originally Posted by Werks View Post
Hey Tony (long time since we've spoke last!) I've tested most of these oils that people use for after run and I can tell you that when it comes to Marvel Mystery Oil, at least their Air Tool Oil it will do the same thing if you douse the engine and leave it in there for a while.
+1
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Old 08-24-2010, 06:59 AM   #11
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Why not just buy a 4 dollar bottle of after run oil that is designed for this actual purpose????
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Old 08-24-2010, 07:02 AM   #12
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Why not just buy a 4 dollar bottle of after run oil that is designed for this actual purpose????
As long as it's not the red stuff. No red aor in these silicone filled cranks.
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Old 08-24-2010, 07:04 AM   #13
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evolution engines makes some good blue oil.
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Old 08-24-2010, 07:12 AM   #14
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I use either Mineral Oil or Amsoil Synthetic 2 Stroke Oil. The Amsoil worked awesome on the MX bike as well. Miss it big time.
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Old 08-24-2010, 08:03 AM   #15
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WE have come across this problem quite a bit with the epoxy coming loose or falling out. If anyone ever needs a crank filled feel free to check out our service. $15 for a re-fill using Oem spec epoxy.

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Lance
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