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Dirt Bike Brands - Other
getting out dents
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[QUOTE="pesky nz, post: 1425182, member: 120687"] [b]+1[/b] I have used a rubber door stop with an 8mm bolt and washers to squash and block the tail pipe end successfully my one is about 25mm thick. It needs to be clean where the rubber touches the pipe. I have tried similar front pipe bungs with three bolts but they were not trustworthy and popped out at close to leathal force too often so on the header end I use a large washer and solder it in place with easyflow or silphoss and use an old valve from an innertube in the centre to be able to fill with compressed air. Whwn I'm finished I heat the solder joint and remove it then pollish the area free of solder. BIG WARNING YOU ARE MAKING A POTENTIAL COMPRESSED AIR BOMB if you count the number of square inches on the surface of the entyre expansion chamber and multiply it by the psi that is how many pounds of energy can be released. Wear safety glasses or a complete head shield. My experiences needed around 60 to 80 psi and heating to a just visible cheery red, any sparkling is way too hot and will usually end with a blow hole shooting sparks across the workshop. I usually had to add extra air after each dent as the pipe got bigger inside more than the heat over-pressurised. If any area bulged out too much a very gentle tapping with a small hammer will be able to smooth it back into place. I've never had an explosive split but often get a leek and have to depressurise and weld up small cracks or pin holes. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
getting out dents
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