Here we go again thought we were done with header problems

[stingray719]

This was likely caused by the extra heat and pressure from the turbo, the header was not designed for that

Maybe, but the weld is a cold weld. Proper weld is stronger than the metal around it.

 

[Mountaintech]

This was likely caused by the extra heat and pressure from the turbo, the header was not designed for that

X2. Another reason is the open tunnel directly below the header. (extreme heat cycling) Has anyone taken a look at the inside of the OEM flex joint? Does it have an interlocking liner or is it just braided mesh?

 

[newtron]

This happened to me last year. Kept loosing boost so took it to Hurricane thinking it was the turbo but turned out the header was cracked. Dave did a great job welding it!

 

[turbo800]

The seam is always where it cracks on a 2 stroke pipe too! Usually the first sign is slight loss of boost then the longer you ride the louder it gets! I agree the weld does look cold....it probably would have been ok if it wasn't boosted. Should be an easy fix to weld with a Tig!

 

[Mountaintech]

The seam is always where it cracks on a 2 stroke pipe too! Usually the first sign is slight loss of boost then the longer you ride the louder it gets! I agree the weld does look cold....it probably would have been ok if it wasn't boosted. Should be an easy fix to weld with a Tig!

That is where cracking will almost always occur, whether it is a cold weld or not. The area immediately adjacent to the weld bead is the weak point. The part was not designed for a boosted scenario, and because it is continually being sprayed by cold snow or water, will fail quicker. Looks like the EVO stainless header is the ticket for now.

 

[Srxspec]

The weld was done with no gas. Also the weld is also only on the upper 1/2 of the pipe as well. The item was covered under warranty.

 

[wot-75]

Has anyone taken a look at the inside of the OEM flex joint? Does it have an interlocking liner or is it just braided mesh?

Yep, the flex joint is actually built very well, oever-engineered.

Interestingly, it appears to be directional as well.. there's a lip inside it that if facing the wrong direction could cut down on air flow, aka, less power if Cat installs it backwards.. wouldn't surprise me lol.

 

[Yamadog]

That is where cracking will almost always occur, whether it is a cold weld or not. The area immediately adjacent to the weld bead is the weak point. The part was not designed for a boosted scenario, and because it is continually being sprayed by cold snow or water, will fail quicker. Looks like the EVO stainless header is the ticket for now.

You guys are missing the point here! You are all saying that the pipe is not designed for the turbo yet now there is turbo packages available for low land and mountain applications from Yamaha this most definitely will be a head ache for them. How many thousands turboed or s/c'd the nytros and I never saw a post on header failures there! And how many of us on Rx's and apex's dealt with donuts and cracked pipes without the added heat or pressure of the turbo? I know I had 4 rx's that did it and at

 

[Mountaintech]

You guys are missing the point here! You are all saying that the pipe is not designed for the turbo yet now there is turbo packages available for low land and mountain applications from Yamaha this most definitely will be a head ache for them. How many thousands turboed or s/c'd the nytros and I never saw a post on header failures there! And how many of us on Rx's and apex's dealt with donuts and cracked pipes without the added heat or pressure of the turbo? I know I had 4 rx's that did it and at

I don't think I'm missing the point. The #1 fatigue and failure item in a turbo system is a thin wall exhaust between the head and turbo. Yamaha is endorsing a turbo kit produced by an aftermarket manufacturer. If they were to design it, you can bet it would look a little different. Producing and selling turbo kits is all about the price point. The trick is to alter the sled as little as possible, and use as many OEM parts as you can to keep the costs competitive.

 

[Yamadog]

Yup and they are going to be replacing a lot of headers under warranty!

 

[TD Max]

Yup and they are going to be replacing a lot of headers under warranty!

Or just yours because it was borderline defective. No doubt running the engine to destructive temps had an impact as well.

 

[stingray719]

A cold weld will fail on a Ford Taurus.....When we see actual failures of a healthy pipe I will be worried.

 

[Srxspec]

New header has an added gusset on it. Anyone (turbo or not) should probably keep an eye on their 2014 model header (updated part number as well).

 

[yamaha1973]

Interesting...

 

[TestMaster]

New header has an added gusset on it. Anyone (turbo or not) should probably keep an eye on their 2014 model header (updated part number as well).View attachment 98853

Thank you for the observations, agree 100%.