Help Need a fuel tank!! YZ426
Posted November 12, 2008 - 03:33 PM
Posted November 13, 2008 - 06:29 PM
Posted November 14, 2008 - 12:11 PM
The tank is made from polyethylene so you can do one of two really cheap things:
1. Weld it with material shaved off the tank bottom where it's not visible (my plan).
2. Weld it with a chunk of plastic from another polyethylene container.
I have been told by a chemical engineer that polypropylene will also work but he would stick to the same material because it would have the same molecular structure. Both are safe to use for gas containers.
The hard thing is being able to tell the difference between the two materials.
Polyethylene is a little more plyable but that doesn't tell you much....
You could use a chunk off a fender or recycle bin to weld into the tank - once again though - how do you tell the difference.
Glueing or epoxy is very temporary and will likely leak very soon - those epoxies are NOT designed to work with chemicals such as gasoline.
I will be shaving off some material on the bottom of mine to use as filler and use a flat head soldering iron to do the welding, to do it successfully, you have to melt the tank and the filler together and build it up a little bit - just like regular metal welding - don't burn it - just melt it together.
With a YZ tank - don't you have to change out the seat too?
Also - reason I'm fixing mine and not replacing is because I just put new graphics on last fall and it would be a shame to lose the perfectly good tank portions.
Posted November 15, 2008 - 02:21 PM
Posted November 16, 2008 - 06:35 AM
Posted November 17, 2008 - 07:55 AM
Some of the same plastic.
I fixed mine this weekend and tested it (pressurized it with gas in it) - shaved off some plastic strips from the corners on the underside with a sharp blade - strips were quite thin - don't need to be thick.
Carefully melt the top 1mm layer starting beyond one end of your crack and working down the length of the crack - as you go, feed the shaved off strips into the soldering iron where the crack is and smooth it out using the soldering iron - you need to melt both the tank and the filler strips together - overlaying it onto an unmelted tank won't do it.
Here's a video of a pro doing it - haha: