Blown Viper Motor. Diesel fuel.

[Rev-it]

Two sleds filled up out of the same pump, drove 42 miles before it blew. Other sled was a 2 smoke 800 and we were both to the pin across the lake. These motors have been turbo'd for thousands of miles with no issue. This is a one in a thousand failure. Injector, jems controller, one hole leaned out. I am bringing the awareness to people about the issue and the lack of caring from Yamaha. Also I figure if my vehicle comes with a turbo and has the ability to not self distruct with the quality of fuel now a days. Why can't a snowmachine that costs half the price with no where near half the build cost.

 

[Studroes144]

The ecu in these sleds is setup rather aggressive, which for a boosted sled is not a good thing, also the non innercooled kit is forcing very hot air into the engine. Not saying this happened to you, likely it's a faulty part like you said, but I know the local yammi rep in our area has been made well known of the potentially bad things that can happen to these things once boosted and stuff not set just perfect. What do u mean by "to the pin across the lake"? That intake air keeps getting hotter and hotter and long wot runs are going to result in bad things, if it was being held wide open for a mile, I think we founds the problem

 

[stingray719]

Two sleds filled up out of the same pump, drove 42 miles before it blew. Other sled was a 2 smoke 800 and we were both to the pin across the lake. These motors have been turbo'd for thousands of miles with no issue. This is a one in a thousand failure. Injector, jems controller, one hole leaned out. I am bringing the awareness to people about the issue and the lack of caring from Yamaha. Also I figure if my vehicle comes with a turbo and has the ability to not self distruct with the quality of fuel now a days. Why can't a snowmachine that costs half the price with no where near half the build cost.

Don't panic yet, countless numbers of this engine have been boosted without any issues. Like rev-it said this is a one off issue of some kind, and looks like weak injector combined with weak fuel pump if I had to guess.

 

[cannondale27]

Two sleds filled up out of the same pump, drove 42 miles before it blew. Other sled was a 2 smoke 800 and we were both to the pin across the lake. These motors have been turbo'd for thousands of miles with no issue. This is a one in a thousand failure. Injector, jems controller, one hole leaned out. I am bringing the awareness to people about the issue and the lack of caring from Yamaha. Also I figure if my vehicle comes with a turbo and has the ability to not self distruct with the quality of fuel now a days. Why can't a snowmachine that costs half the price with no where near half the build cost.

I dont buy that. That was water either in the gas or from the head gasket that took that out. If it were lean the damage would be on the crown.

 

[kodak]

Shouldn't this be a test for octane level and if within the suggested safe zone suggested by Yamaha and MPi then they should cover it and if not we'll tough luck and let everyone know where you bought your gas. What is the sense of boosting a sled if you can't hold it open for a mile. Yamaha should stand behind there boosted sleds because they seem to know to compete with the other competitors they need to boost their sled if not why do they always bring boosted sled to shootouts this has been done since the nytro from articles I have read over the years. Just my 2 cents I do feel this is probably a one of and if gas is not the issue this should be covered bad news spreads faster than the news from the many happy turbo viper owners

 

[Rev-it]

I don't know if the gasket was gone or not. I assume it was.

 

[Rev-it]

I keep my sled outside covered fill up at the same two gas stations as a lot of other sleds because they are the easiest to get to by sled. The gas station I filled up at when I got my sled out of the shop, two of his sons own the same sleds just different colors. And the dealer fills there as well. This is only time it has been in the shop because the little ball froze in the oil separator and puked all the oil out of the motor. Dealer changed the rollover valve and I drove it from there to where it blew up.
The sled did bobble once and when I slacked off to half throttle it went away. I went about a 1000' and it died again on one cylinder. I let off and accelerated and it still had lots of power just running on two. I looked down and seen smoke rolling out from the right side panel and let off the throttle. Sled went to idle and died. The next day I got it pulled back to town and I filled it with oil and when I hit the key. Nothing starter just clicked. Loaded it and took it back to the dealer.

 

[Rev-it]

Another thing is if a guy was getting bad gas why can't we back off on the timing like the cats have? We are running their programming for some stupid reason. Yamaha had a bullet proof system and to let someone else run it? Nytro programming worked. Why isn't it on this?

 

[Studroes144]

This ecu is much more complex than that of the cat turbo, which is why nobody has been able to crack it yet and actually come up with a solid flash that works, even the yamaha ecu update is not consistent and many guys are having issues with that, there's a reason for that, and you can be certain it's the same reason that the yamaha factory race vipers are using the old nytro electronics and ignition. That being said, I had a head gasket go on mine recently, no sign of running lean, no detonation, just leaking a bit in one spot, sled ran flawless and you'd have never known except it was slowly forcing coolant back into the overflow bottle, right where the gasket leaked it did cause just a little chip on the top edge of that piston, no other damage but they r replacing the piston since the engine was out because of the starter going anyways. But the consensus was that there was no reason for the head gasket to blow, especially only running 5.5-6 pounds of boost. Head studs right from the start would've kept this from ever happening and a slightly thicker gasket, like what they're using in mine now, would only help matters by lowering compression a bit. In your case, if the head gasket blew bad enough and there was a lot of coolant leaking into that cylinder that could very easily be the cause of the piston looking like that

 

[cannondale27]

This ecu is much more complex than that of the cat turbo, which is why nobody has been able to crack it yet and actually come up with a solid flash that works, even the yamaha ecu update is not consistent and many guys are having issues with that, there's a reason for that, and you can be certain it's the same reason that the yamaha factory race vipers are using the old nytro electronics and ignition. That being said, I had a head gasket go on mine recently, no sign of running lean, no detonation, just leaking a bit in one spot, sled ran flawless and you'd have never known except it was slowly forcing coolant back into the overflow bottle, right where the gasket leaked it did cause just a little chip on the top edge of that piston, no other damage but they r replacing the piston since the engine was out because of the starter going anyways. But the consensus was that there was no reason for the head gasket to blow, especially only running 5.5-6 pounds of boost. Head studs right from the start would've kept this from ever happening and a slightly thicker gasket, like what they're using in mine now, would only help matters by lowering compression a bit. In your case, if the head gasket blew bad enough and there was a lot of coolant leaking into that cylinder that could very easily be the cause of the piston looking like that

That is some good advice and direction I will go if ever putting a turbo on.

 

[Rev-it]

It's proving it so they would fix it. Kinda hard you say it happened before they say after.

 

[Rev-it]

It's my last resort. I am waiting as patiently as a guy that just blew a lot of cash on something I might get to ride next winter. Waiting for the dealer to get back from his sled trip in the mountains to look at my sled.

 

[stingray719]

This ecu is much more complex than that of the cat turbo, which is why nobody has been able to crack it yet and actually come up with a solid flash that works, even the yamaha ecu update is not consistent and many guys are having issues with that, there's a reason for that, and you can be certain it's the same reason that the yamaha factory race vipers are using the old nytro electronics and ignition. That being said, I had a head gasket go on mine recently, no sign of running lean, no detonation, just leaking a bit in one spot, sled ran flawless and you'd have never known except it was slowly forcing coolant back into the overflow bottle, right where the gasket leaked it did cause just a little chip on the top edge of that piston, no other damage but they r replacing the piston since the engine was out because of the starter going anyways. But the consensus was that there was no reason for the head gasket to blow, especially only running 5.5-6 pounds of boost. Head studs right from the start would've kept this from ever happening and a slightly thicker gasket, like what they're using in mine now, would only help matters by lowering compression a bit. In your case, if the head gasket blew bad enough and there was a lot of coolant leaking into that cylinder that could very easily be the cause of the piston looking like that

Warning for low landers running over 5 pounds boost. MPI has said the stock fuel system should not be used over 6 pounds boost at 0 to 2000 feet altitude. No way I would run a turbo "on the edge" of the fuel system limits, in my opinion just begging for detonation on a sketchy load of fuel. info below taken from MPI site on the fuel upgrade kit. Not that it happened to the OP just putting the info out.




Viper Stage Fuel Pump & Regulator Upgrade (Includes):

• High Volume OEM Walbro Fuel Pump
• Returning Style 1:1 Boost Sensitive Regulator
• All required Plumbing & Hardware
• New pump & regulator typically required above these boost levels:
  • 0-2000ft: 6psi
  • 2000-6000ft: 7.5psi
  • 6000-10000ft: 9psi

 

[cannondale27]

Stingray look at that piston. That is not detonation. That is steam cutting like a torch.

 

[yamahajohnson220]

That is 100% detonation. Good luck with warranty.