KymcoForum.com
General => General Discussion => Topic started by: chubbyrockstar on June 12, 2009, 07:58:14 AM
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I found this whilst Browsing and thought I'd share so mayben it might help someone along the way
Pull the pipe out.
Be careful not to damage the gasket between the cylinder head and the exhaust; if you do, you will have to replace it; it won't do to have gases escaping from this union.
Plug one of the openings of the exhaust; you have to create a good seal here, sometimes wine bottle corks work well, but don't use any tape, as the cleaning chemical you will be using will break it down completely. Now, spray a whole can or two of brake cleaner inside, then plug the other opening; sometimes there is a secondary opening on the side of the pipe, or a "slave tube", plug these as well.
Slosh it around and let it sit for a while; then, slosh it around again and let it sit in a different position; do this as many times as you can and if possible allow the chemical to work overnight. While you are waiting, you can take a look at the exhaust port on the cylinder head, if there is build up here too, clean it up VERY CAREFULLY with a little brake cleaner and a rag; turn the engine so that the exhaust port is covered by the piston, that way you'll avoid pushing deposits into the chamber; don't use a screw driver, as you could damage the piston.
here is another way but I prefer what youve already read above..
http://www.scootertherapy.com/mufflercleanpage.html (http://www.scootertherapy.com/mufflercleanpage.html)
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I know that many mechanics use Coca Cola for overnight session and it works just as well.
I did it also 4-5 years ago when I had two Piaggios NRG 50 (2 stroke).
Of course, blow everything out using air compressor.
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Nice, I will give it a shot!
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OK i used the cola method axy suggested, seemed to work a bit and loosen some of the depositis but i figured if i was goin to do it (which i had too) i wanted to see inside of this thing lol
heres what i did..i cut open the backside of the exaust pipe in a rectangle and then using a screwdriver and a nice high pressured air gun to remove the carbon and man it was bad...heres a pic of after it was welded back closed. now some bbq paint and it you wont even be able to tell.
(http://i271.photobucket.com/albums/jj136/ChubbyRockstar/mopedTIPSnShots/DSCF2606.jpg)
(http://i271.photobucket.com/albums/jj136/ChubbyRockstar/mopedTIPSnShots/DSCF2605.jpg)
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I like to throw the old pipe out and buy an expansion chamber exhaust. :) I've never tried the brake cleaner or coke, might be an interesting project some day.
~Josh
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Good job. :)