Fixing a dented header for cheap!


JohnnyAirtime

Anyone a skeptic??? I sure was, until last night. Here's what I did, and to what:

I dented my FMF Ti header pre-running for the Baja 500 recently. Sure it wasn't too bad, but bad enough where people see it and say "hey... your pipes dented..." Enough to make you want to fix it right?!

After reading on several forums about filling the pipe with water and putting it in the freezer to pop out the dent, I was pretty skeptical. I thought, "how can freezing water be that powerful?" Also, not being any kind of engineer or scientist, I had to try it!

Skeptic? Yes. That is until I actually did it last night and found it to be 100% true! Simply amazing and so easy! Here's just how easy it was:

- Took the header off in about 5 minutes (from CRF450X).

- Added enough water to fill the dented area of the pipe, plus a bit more

(did not end cap the pipe or plug anything).

- Placed in freezer so that the pipe wouldn't leak any water.

- Woke this a.m. to a near perfect repair!

This repair sure saves taking the pipe to a welder (which I am by hobby) and having them use a rosebud and air to blow out the dent!! Plus, this is MUCH cheaper. You may need to attempt this two, three or four times to get the dent completely removed. But don't give up, the reward is worth it.

Good luck!! And have fun!

An edition to this article by sootgrinder

In the tech tips section there is a nice write up on how to use the freezer to pop out dents in your exhaust header pipe. It is a nice article, and the process works well for four stroke pipes that are a consistent diameter, I.E. not stepped headers or Powerbomb type headers. But it would be nice is you could put some language at the end of the article to warn against using this tip on stepped headers and definately not two stroke expansion chambers. I have personally seen expansion chambers ripped apart at the welds when trying to use the freeze technique. I just want to prevent someone from ruining an exhaust system, and getting upset because they thought it would work for expansion chamber pipes as well.




User Feedback


i did it with my expansion chamber and yes ! it did split it an not even at the weld it split a 6in. crack down the middle little over an inch from the weld heads up do not try this with an expansion chamber ! lol

Share this comment


Link to comment
Share on other sites

I wonder if this would work in an expansion chamber if you used less water? The key would be to add just enough so that when it expanded it would just fill out the original pipe. One problem is that the dent material will likely be harder than the rest of the pipe due to work hardening. To fix this, you could anneal the pipe by heating it up just below cherry red, then cooling it very slowly. Easy to do by burying it in a nice bed of hot campfire coals and just leaving it there to cool as the coals die out, say overnight. Just a thought.

Share this comment


Link to comment
Share on other sites


Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:


  • Similar Content

    • By yz480doinwork
      Brand new, still in the packaging Lexx end cap fits the stock muffler of 2006 & 2007 YZ450f and 06-13 YZ250f. Comes with a forest service approved spark arrestor and two different size tips. Don't spend hundreds of dollars on a slip on, this tip can be quiet and forest legal or loud and make power! Also a note for WR450 guys: get this tip and find a used 06/07 YZ muffler, fits directly on 09-15 WR450. $80 shipped free to the lower 48. PM, call or text 406-223-8789
    • By TeamGrey
      Have anyone used wiseco center intake valve with the four rest beginning OEM? How does it turn out in terms of power and reliability? 
    • By Liquid10
      My 2011 YZ250 is undergoing a full engine and chassis rebuild and I have decided to go with a 300 kit (the bike needs a new cylinder anyway so this is a good time to do it). 
      The current YZ250 power curve/delivery is good so i'm not aiming to create a torque monster that doesn't rev, just looking to add more power throughout the current range.  I primarily ride MX, intermediate level.
      My questions for those run an Athena 300 kit are below:  
      Has it been reliable?
      Is there in increase in bottom end/crank problems?
      What pipe/jetting do you run/recommend (for MX, 0-1500ft altitude)?
      Anything I need to watch out for during install (I've heard Athena circlips are bad)?
      Did you have custom porting done and if so who do you recommend for that?
      What octane of fuel do you run?
       
      Thanks in advance!
        
    • By pbblueroom
      Hi Everyone,
      I just picked up a 2000 TTR90 for my son.  the previous owner had the exhaust fall off while riding and a guess left it in the desert. Anyway I want to pick one up, cheap. I'm not looking for extra power or anything.  Ebay has a ton that say they fit, but I don't see how they fit the support bracket, and the exhaust pipe is 26mm, but these all seem to only go down to 38mm. here are some links so you can see what I'm talking about.  If you know a good link for one please let me know.  
      https://www.ebay.com/itm/Universal-38-51mm-Motorcycle-Carbon-Fiber-Exhaust-Muffler-w-Removable-Silencer/332167907200?fits=Year%3A2000|Model%3ATTR90&hash=item4d56c00780:g:WSQAAOSwzgBY23oo&vxp=mtr
      https://www.ebay.com/itm/28mm-Exhaust-Muffler-For-90cc-110cc-125cc-Dirt-Pit-Bike-TTR-CRF50-SSR-Thumpstar/321988125687?hash=item4af7fce3f7:m:mtBWjDVUEnYxJPki7bidl3Q&vxp=mtr
      https://www.ebay.com/itm/Universal-38-51mm-Motorcycle-Carbon-Fiber-Exhaust-Muffler-w-Removable-Silencer/232615617126?fits=Year%3A2000|Model%3ATTR90&hash=item3628f8a266:g:WSQAAOSwzgBY23oo&vxp=mtr
       
       
       
       
       
    • By moto blitz
      Yoshimura RS-9D complete exhaust system. Completely refurbished by Yoshimura with tunable inserts and spark arrestors. 
      TI/TI/CF USFS approved.  2015/16 CRF450R    1 310 923 3091