Warning, -16 late build Viper turbo breakdowns, bad rods.

[Joe ltx-le]

I sure hope they didnt do testing for just stock. Has to be another bad batch of parts or something. A rod is pretty easy to test and why would they accept something less than what they had?

that's a really good question.
I obviously don't know for sure but I hate to say it, but maybe Yamaha just went cheap, as far as testing and quality of material.

I mean come on! Your absolutely right rods are so easy to test.

 

[shagman]

For sure, but the internals on the 1100 are all built extremely beefy, an 1100 turbo connecting rod looks like a big club compared to a viper rod, I myself would've hoped to see the new engine internals made more beefy and lower compression since turbos are becoming the biggest craze lately.

I agree. Ive seen the new rod print and the old one side by side and the new one is beefyer. It should be stronger. its also shorter than the old one. I would lean more towards not made correctly.

 

[stingray719]

I sure hope they didnt do testing for just stock. Has to be another bad batch of parts or something. A rod is pretty easy to test and why would they accept something less than what they had?

Once again you are taking something said on a forum as fact, without any real proof. Lets wait and see if this is really an issue. Maybe it is, but let's wait and see if MPI or EVO have issues first.

 

[cannondale27]

Once again you are taking something said on a forum as fact, without any real proof. Lets wait and see if this is really an issue. Maybe it is, but let's wait and see if MPI or EVO have issues first.

Pretty hard to deny a picture of a bent rod with failure point numbers to match Stingray. That said you are right. Its still possible this is just a bad batch of rods.

 

[Tarzan]

Want to see a movie with the new engine in the dyno at MPI like they did with the kit when they got the contract with Yamaha. Long dynotest as the video they did then

 

[ntm_08]

The new crank is just 1/3 of the cost of the old one.

 

[Tarzan]

Anyone that knows the weight on the new engine compared to the old?

 

[Joe ltx-le]

IMO. There was no reason to change any of the critical parts in the nytro engine. other then just cheaping out on production cost.

Only hope is they fix the problem and this is just some growing pains.

 

[Dealerjohn]

Once again you are taking something said on a forum as fact, without any real proof. Lets wait and see if this is really an issue. Maybe it is, but let's wait and see if MPI or EVO have issues first.

Haha, yes because MCX don't have any idea what they are doing.

 

[Joe ltx-le]

Haha, yes because MCX don't have any idea what they are doing.

Lol I sense the sarcasm.
It shows mpi and mcx do much more extensive testing then factory. I would believe any notice from either company before I believe Yamaha. I'm talking from experience on this one.

 

[Beenba]

I disagree that testing a rod is "easy".....a static load test with a press and the dynamic factors running in an engine are two totally different beasts.
A rod can fail from a bad tune if it starts knocking/detonating...Yamaha will have their work cut out to solve this one. Hopefully just faulty materials though.

I agree. Ive seen the new rod print and the old one side by side and the new one is beefyer. It should be stronger. its also shorter than the old one. I would lean more towards not made correctly.

New rod is shorter? Did they make up the stroke with the crank? Seems very odd.

 

[baggs66]

i would say this is a heat treat problem to hard and they are brittle to soft and they bend but time will tell.could be a material problem also sometimes the new and better isn' t so, what i do know is this will be costly for all involved, wish the best to all.

 

[Mountaintech]

Lol I sense the sarcasm.
It shows mpi and mcx do much more extensive testing then factory. I would believe any notice from either company before I believe Yamaha. I'm talking from experience on this one.

Yes, I have no problem digesting this info from MCX. If it is a problem for them it should show up in other places as well. They have been doing this longer than most other vendors.

 

[shagman]

I disagree that testing a rod is "easy".....a static load test with a press and the dynamic factors running in an engine are two totally different beasts.
A rod can fail from a bad tune if it starts knocking/detonating...Yamaha will have their work cut out to solve this one. Hopefully just faulty materials though.



New rod is shorter? Did they make up the stroke with the crank? Seems very odd.

Made up height with new piston. Crank offset controls stroke.


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[cannondale27]

I disagree that testing a rod is "easy".....a static load test with a press and the dynamic factors running in an engine are two totally different beasts.
A rod can fail from a bad tune if it starts knocking/detonating...Yamaha will have their work cut out to solve this one. Hopefully just faulty materials though.



New rod is shorter? Did they make up the stroke with the crank? Seems very odd.

The test MCX did is valid because they also tested a old rod the same way. Now MCX needs to cut up both new and old rod and do hardness tests to see what the difference is. That will determine cause. Either way if the goal is equal or better strength the new rod failed. Does it mean failure in a stock motor? No not necessarily but that wasnt their stated goal. In the Yamaha press release they said the new motor was equal.