Cold fusion midshaft housing - "cold welding" ?

[Christian_83]

So when i build my 2019 DJR Nitro i decided to put in some new bits, like a bran new cold fusion midshaft housing, always thought these were super nice. But after doing some inspection i was quite surprised that this has started to come apart, after under 10 hours of ride time. half/half freshwater and saltwater (not super super salty)
Is this common and why they stopped making these?
Im disapointed to say the least

 

[smoofers]

To me that just looks like the overlapped elastomer is starting to separate from the housing due to vibration. I wouldn't be concerned with what you are seeing. If it continues to grow and delaminate from the actual bore of the housing, that's when I would start to worry.

 

[Christian_83]

Let me tell you, this driveline is propper aligned. Not my first rodeo
I cen get a feeler gauge between the housing and the rubber, so its not just the lip, it has delaminated from the bore. Might be hard to see on the video
The other OEM midshaft housing i used in my KDX/KVX for 5 years has not seperated. So no i have to decline - its not due to vibrations.

 

[Christian_83]

***** is censored from "fee ler gauge" i donno why

 

[Harbor]

Is this common and why they stopped making these?
Im disapointed to say the least

Not sure, ... I also have the cold fusion, it’s anadized red and has CF logo, but I’ve never pealed the sealing lip back.. mine is about 5 years old and no issues so far...I just reinstalled it and can’t check under the lip

 

[Wetbuffalo]

Let me tell you, this driveline is propper aligned. Not my first rodeo
I cen get a ************ gauge between the housing and the rubber, so its not just the lip, it has delaminated from the bore. Might be hard to see on the video
The other OEM midshaft housing i used in my KDX/KVX for 5 years has not seperated. So no i have to decline - its not due to vibrations.

OEM only. The durometer is not right on the AM ones. What motor mounts are you running?

 

[smoofers]

Let me tell you, this driveline is propper aligned. Not my first rodeo
I cen get a ************ gauge between the housing and the rubber, so its not just the lip, it has delaminated from the bore. Might be hard to see on the video
The other OEM midshaft housing i used in my KDX/KVX for 5 years has not seperated. So no i have to decline - its not due to vibrations.

I didn't mean your driveline was misaligned. Two strokes vibrate by nature. With flexy motor mounts and an idling big bore two stroke, you're going to see some vibration regardless of alignment.

 

[Christian_83]

OEM only. The durometer is not right on the AM ones. What motor mounts are you running?

Running OEM GP 800 mounts Been using these for past 7 years, only way to go IMO

 

[Christian_83]

I didn't mean your driveline was misaligned. Two strokes vibrate by nature. With flexy motor mounts and an idling big bore two stroke, you're going to see some vibration regardless of alignment.

Yeah well in that case i suppose they have to "reverese engineer" the proiducts - if a OEM midhsaft housing can withstand, they should be able to make a "high end" product that can do the same. But i guess not

 

[zzylstra]

Yeah well in that case i suppose they have to "reverese engineer" the proiducts - if a OEM midhsaft housing can withstand, they should be able to make a "high end" product that can do the same. But i guess not

Must be a lemon, My CF housing still looks new after years of use

 

[TheBuzzard]

the rubber is supposed to be vulcanized to the aluminum. it probably wasn't done correctly and didn't stick that good.
same reason aftermarket motor mounts are junk, the rubber lets go of the metal.
just like on the kawi, that housing is just a seal between the water and the engine compartment. its not there to keep; the driveshaft from wobbling, so even if it was totally unstuck from the metal, it would still work but some water might leak by.
put a bead of silicone on that lip and forget about it

 

[Wetbuffalo]

Running OEM GP 800 mounts Been using these for past 7 years, only way to go IMO

The rubber in the OEM mounts absorbs energy at a different rate then the AM midshaft housing. You need to match that with an OEM midshaft housing

 

[Christian_83]

the rubber is supposed to be vulcanized to the aluminum. it probably wasn't done correctly and didn't stick that good.
same reason aftermarket motor mounts are junk, the rubber lets go of the metal.
just like on the kawi, that housing is just a seal between the water and the engine compartment. its not there to keep; the driveshaft from wobbling, so even if it was totally unstuck from the metal, it would still work but some water might leak by.
put a bead of silicone on that lip and forget about it

Ive already done that, Just a bit disapointed. Guess its OEM again after this

 

[Christian_83]

Must be a lemon, My CF housing still looks new after years of use

But you run only freshwater, or also salt?

 

[zzylstra]

But you run only freshwater, or also salt?

Mostly fresh, has seen salt and brackish before

 

[Christian_83]

Okai, could be that i got one of the "export lemons"