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I've started to notice rust on my Burgmans exhaust. If I don't do anything about it, will it hurt the scooter in the future? Is rust a purely cosmetic issue or can it hurt the function of the scooter? Lastly, I read about coca cola as a way to remove rust. Soak the exhaust in coca cola to remove rust? Does that really work?
 

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The rust won't help anything but it really doesn't hurt either. I had two Suzuki GS500 motorcycles in the late 90's and their head pipes would rust, I would sand the rust off and repaint, then the rust would return in a few months.

The best solution is to purchase an aftermarket stainless steel exhaust system but that's at least $300.

FYI, my 04 Burgman has a rust pipe too. Now my muffler is started to rust apart from the inside and sounds like loose gravel. I'll be replacing it soon with a stainless system from http://www.pjsparts.com/catalog/product_info.php?products_id=5284
 

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Where's the rust? If it's on the header pipes then don't worry about it. You live in western WA state I think, where the roads aren't salted in the winter, so vehicles aren't exposed to that horror. Only if the rust appears to be deep corrosion, as in it's about to poke a hole through the pipe, would it worry me.
 

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The Leo Vince all-stainless-steel exhaust that I bought
at a bargain-price sale for my 400, goes all the way to
the cylinder head, after removing the short header pipe.
The exhaust system listed above appears to only go to the
short exhaust header pipe that is attached to the cylinder
head...a MUCH easier installation job.
Make sure to use a new gasket at the bolt-together flanges.:)
An OEM Suzuki muffler/exhaust pipe (non-stainless steel)
will cost somewhere over $400 in the US.
 

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Phosphoric acid is the active ingredient that is in Coca Cola and can be found in a lot of things. Molasses will even work, even better if you add low voltage to it.
Here's a link to Google information. https://www.google.com/search?q=Molassus&rlz=1C1KMOH_enUS565US566&oq=Molassus&aqs=chrome..69i57&sourceid=chrome&es_sm=122&ie=UTF-8#newwindow=1&safe=off&q=molasses+to+kill+rust+from+metal
Here's a link to a video of someone trying it for the first time https://www.youtube.com/watch?v=vq5IUiYMhRM
The best option to kill rust would be Ospho. http://www.ospho.com/
 

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I learned about the molasses for an old man when I was restoring my Model T Ford. It works even better when it's hot. For larger parts you can take a kids swimming pool for the molasses bath and cover it with visqueen(polyethylene plastic sheeting) and put it in direct sun, the more molasses the quicker it works. With heavy pitted parts just leave them soaking for days out in the sun.
 
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