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Smoke from pipes
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Smoke from pipes - April 26, 2007, 04:23 PM

Last fall I got some high temp black spray paint and painted my exhaust. It had a good coat of rust. Now when I start my bike up it smokes. I am pretty sure it's the rust and spray paint that is smoking but I need to get a inspection done. Do you guys think I might pass if I explain it to the inspector?


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April 26, 2007, 04:31 PM

What pipes did you paint?
The smoke is coming off the outside?


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April 26, 2007, 04:37 PM

Outside. These are the pipes that come from the engine (4) and they merge into one pipe out the back. Where the smoke is coming from is where the 4 pipes merge under the oil pan. I have checked and checked for a oil leak and all is dry. The only thing it could be is the rust from where I took a wire brush and rust remover and then spray painted over it with high temp paint.


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April 26, 2007, 08:30 PM

just let it run, and rev and hold or ride, itll stop smoking eventually, or catch fire----be careful
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April 27, 2007, 07:26 AM

This sounds like an oil change problem. I know you said it was dry, but did you change the oil and is it possible that just a very little drop or two landed in the crevaces of those pipes? It will smoke for about twenty minutes or more if that's the case. How about smell? Any odor noticed?
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April 27, 2007, 08:12 AM

Quote:
Originally Posted by 1hander
just let it run, and rev and hold or ride, itll stop smoking eventually, or catch fire----be careful
HA!


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April 27, 2007, 08:34 AM

Quote:
Originally Posted by Madali
This sounds like an oil change problem. I know you said it was dry, but did you change the oil and is it possible that just a very little drop or two landed in the crevaces of those pipes? It will smoke for about twenty minutes or more if that's the case. How about smell? Any odor noticed?
Nope, I check for that, and even sprayed a cleaner in the crevices and flushed it real good. There is a smell but does not smell like oil. I can't describe the smell other then maybe a plastic burning smell? I have ridden it for about 2 hours now and it still smokes.


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April 27, 2007, 08:53 AM

Does it smoke from several areas? If so, just burn in the paint more.
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April 27, 2007, 09:15 AM

Quote:
Originally Posted by Jedi
Outside. These are the pipes that come from the engine (4) and they merge into one pipe out the back. Where the smoke is coming from is where the 4 pipes merge under the oil pan. I have checked and checked for a oil leak and all is dry. The only thing it could be is the rust from where I took a wire brush and rust remover and then spray painted over it with high temp paint.

Ok, so you painted the header and you're getting smoke from the union. Rust does not burn so this has to be something else. It could be that you have this rust remover (what did you use? Petro-based?) mixed with the scrapings/fines from your wire brushing effort caked in the union, coated with a nice layer of hi-temp paint. Check again for an oil leak. Do you know what burning oil smells like? If not, swab a little tiny bit on a header pipe up near a cylinder and fire up and get a whiff after it starts buring. Then decide if it is the same or different from the other smoke.

After you are pretty sure you don't have one, check again. Don't just look at the pan above the union. Oil moves once it drips onto the exhaust accroding to the force of gravity so look upstream of where the smoke is coming from. Also check to make sure your rear brake system isn't leaking/squirting fluid onto the exhaust. After you do whatever it takes to be 100% certain that you do not have an oil leak that is allowing drops of oil to fall on your exhaust (even as little as just one drop per day), go for a nice long ride this weekend and burn that stuff off. I hope that does the trick.


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