exhaust dents,true? can u get rid?

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hyper 78

hyper 78

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I read that you can get rid of dents in your zaust by filling with water and freezing to pop out a dent, am i being daft or can this be true?questions, questions!
 
Back when I used to ride dirt bikes(I was 12 years old or so) we never did try that freezing technique as our freezer was never large enough to hold something that large. Also I doubt any mom out there would ever let a crusty exhaust into the freezer just to fix a dent. The fix back in the day was to insert a rubber expansion plug on one side. My dad fabbed up a t-fitting with a rubber coupler;
-1 side would have the rubber coupler on to the sleeve(other end of sleeve would be on pipe) while both ends secured with hose clamps.
-1 end ended up with some sort of tire valve stem.
-last end just had a pipe plug installed.

With an acetylene torch we would heat the dented area cherry red hot. Once hot enough, grabbed a tire inflator/air chuck, hook it up to the tire valve stem and fill with air. The air pressure in the pipe would push out the dented/cherry red hot area out. Keep in mind it doesn't take much pressure to pop it out. Once satisfied, remove the air chuck and remove the pipe plug quickly to relieve the pressure. Also keep in mind it never ends up looking like new, small blemishes still could be seen. Once the area is nice and cool, sand the area and/or the whole pipe assembly and repaint with some high heat stuff.
 
I've used this technique before on my nitros with varying degrees of success and I know a few two stroke dirt bike guys who have managed to freeze dents out of their pipes. A lot of it depends on the size and location of the dent. Dents on a straight section of the pipe stand a better chance of being popped out versus dents on bends or near the stinger. It may take several applications and there is a chance of the pipe splitting. You'll need to cap off the ends of the pipe with expansion plugs otherwise the water will just ooze out of the pipe when it freezes instead of freezing inside the pipe and popping out the dent.
 
one2boost said:
Back when I used to ride dirt bikes(I was 12 years old or so) we never did try that freezing technique as our freezer was never large enough to hold something that large. Also I doubt any mom out there would ever let a crusty exhaust into the freezer just to fix a dent. The fix back in the day was to insert a rubber expansion plug on one side. My dad fabbed up a t-fitting with a rubber coupler;
-1 side would have the rubber coupler on to the sleeve(other end of sleeve would be on pipe) while both ends secured with hose clamps.
-1 end ended up with some sort of tire valve stem.
-last end just had a pipe plug installed.

With an acetylene torch we would heat the dented area cherry red hot. Once hot enough, grabbed a tire inflator/air chuck, hook it up to the tire valve stem and fill with air. The air pressure in the pipe would push out the dented/cherry red hot area out. Keep in mind it doesn't take much pressure to pop it out. Once satisfied, remove the air chuck and remove the pipe plug quickly to relieve the pressure. Also keep in mind it never ends up looking like new, small blemishes still could be seen. Once the area is nice and cool, sand the area and/or the whole pipe assembly and repaint with some high heat stuff.
Click to expand...

this is the best method and does work well as you're only targeting the dented area..you can plug one end with a compressible bung and use a rubber end on an air nozzle (check pic) so the pressure is released instantly as soon as you pull the nozzle away, the freezing method doesn't target just the dent so can split the pipe especially a thin wall pipe like the VRC or samba.

41PZxfZUKUL._SS500_.webp
 
mooman007uk said:
this is the best method and does work well as you're only targeting the dented area..you can plug one end with a compressible bung and use a rubber end on an air nozzle (check pic) so the pressure is released instantly as soon as you pull the nozzle away, the freezing method doesn't target just the dent so can split the pipe especially a thin wall pipe like the VRC or samba.

41PZxfZUKUL._SS500_.webp
Click to expand...

Like mentioned the method my dad used was 20+ years ago. I personally would have ditched the tire valve stem deal in favor of a rubber tipped air nozzle like the one pictured. Back then that is what we had to work with and it did it's job.
 
dwarfy said:
I would leave the dents in it personally! Next time out, roll over, dented again - doh!!!
Click to expand...
No doubt will roll it again....and again and again, maybe youre right lol, is it worth trying to get it out only to gat another the next day,anyway, its ready tommorrow, will get it back and have to run in new top end....going to be so hard not to blast it to see if it wheelies. I understand ther are people that rag it from the word go,,,we will have to wait and see!:lol:
 
lol are you kidding? milk? did u put 2 sugars and a tea bag in it ,lol the dent is near the end of the can above the support brackrt(jetpro 2) not on a straight bit,curves around to end pipe.size of a 10 pence piece
 
hyper 78 said:
lol are you kidding? milk? did u put 2 sugars and a tea bag in it ,lol the dent is near the end of the can above the support brackrt(jetpro 2) not on a straight bit,curves around to end pipe.size of a 10 pence piece
Click to expand...

No,no joke.It dosent expand as much as water for some reason.I got the solution off a Moto X forum.
J
 
oh o.k. well if it worked then i cant fault you, but forget that, i have a new probem now that really is stopping me in my tracks, check new thread " cant get started after installing bb kit"
 
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