Maintenance & Technical > KX500 Original

Pipe dent removal

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81cr450:
I need some input on pipe dent removal. I've done it before with banshee pipes & had good luck, but the big bore pipe's tend to spit out my end plugs, due to larger area more pounds per sq".I'll have to revise them for sure, I'm thinking of lathing a barbed edge in the plug to the to help hold the hose on the plug. Makes you about crap your pant when they POP free.
What I do is use regulated compressed shop air, 40-60psi, & then put a mild torch flame to the dent & heat till it comes back out. The problem is as you heat the pipe the air in it expands increasing the air pressure in the pipe, which in turn makes me severely nervous of the metal blowing up in my face before the plugs spit out. The cpi I just dented is extra thick compounding my concern as I know the pressure is going to have to be higher to relieve the dent.
Basically what I need to know is, is my technique sound, how much pressure till the pipe blows through, how much pressure are other guys using. I realize I'm probably over thinking this but when you have 80-100psi under cherry red metal that your staring at...
Thanks for any input

royceymon@hotmail.co.uk:
i have a blow out kit ,i use about 40-50 psi and oxy acet beyond cherry red to more on the yellow side ,i always wear eye protection ,the kit bolts on opposed to push in bungs easy enough to make ican post a photo if required.
on the heat front i watch as i heat the pipe as it doesnt always need the same heat,also you can only get away with heating the same spot twice then it deteriates.

81cr450:
I'd definitely take some pics. Always easier to copy than create from scratch. The set up I've used before is just heater / radiator hose with aluminum plugs attached with hose clamps. Thanks for the help & input

RoostDaddy:
maybe Joe can chime in. (JOKO,  I believe)
He does this stuff, so if you have any trouble contact him.        http://www.fusiononeusa.com
He did my SPES pipe for my KX500 some time ago and I was really pleased for the price.  For those of you that dont know how rare it is to find one of these, I was happy he was able to get it back in order.

Dutch-K5 Fan:
If you look at Mx24.com, motorcross, spareparts,exhaust, pipe repair.(sorry cant copy link om my phone).
I have somewhere a same kit, it use a valve from a tubeliss tire.
You can heat the spot and than pressure the pipe, the safe way. Or first pressure than heat.

Had once that I made the spot to hot that it blow open. I use the first option since.
There are been more company's who made these kits, Doma, UFO,TMV(dutch brand) and more.

Dutch

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