For the sake of longevity I've actually lowered mine 500 RPM's. The recent news of cranks snapping has me erring on the side of caution. Power is still falling off at 14k so what's the point of going past?

 

The recent news of cranks snapping...

Wut?

Link(s) please.

 

Hmm. I haven't heard about cranks snapping but not really reading forums as much lately. Power doesn't feel to be falling of at 14k at lower gears, and feels like you can carry more speed/hp between gear changes with increased rev limit. But ok I guess I will not increase but also won't decrease it. I will probably keep it at factory rev limit.

 

EDR Performance out of Oregon has seen some stuff.
This post is dated 26 July. There's another post or two prior to this, but this part seemed the most relevant. Check out the comments on the side.

 

I wonder if the failures are occurring on the 2015's, the 2016's with the additional support from the added bearing, or all years? Eric's phrase "FOR RACING" stood out. Just how hard these bikes are being pushed on the track, though? Are they tuned to the ragged edge, with the maximum rpm's being exceeded on a regular basis? Tim Radley states that they're back to "near stock rpm limit" on their R1 racebikes. I'd say that the rev limiter is there for a reason.

As for the R6's eating their crankshafts Tim said that they've been doing so "for years." I'm not a regular on the R6 forum but I can say that from all the racers and trackday regulars I know (and it's a substantial number), I have not heard of crankshaft failures on those bikes. Personally, since my r1 is a streetbike first and doesn't see the track as often as my 750 does, I'm not going to worry about the sky falling here.

PS: IIRC the 2009 GSXR1000's snapped cranks when race tuners tried to squeeze more power of the motors. Not aware of any street bike failures though.

 

By no means do I think the sky is falling. In my situation the bike will only be tracked/raced, and I can't see it hurting me on track, or in the longevity department, so a reduction of 500 rpm's sounds sensible. Time will tell, though our very own @R1@150@alltimes just lost a motor to, what I think was a snapped rod. That was another thing EDR said; "Two thousand (race) miles and replace the rods."

And the R6's, I remember hearing that high mile race motors could snap a crank, but never read of it happening. I think most serious racers replaced the cranks ahead of time.

 

I wouldn't worry about reliability if the engine is assembled and tuned correctly.

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There's only one shop spreading panic about cranks snapping. We work with so many of these that are used and abused often at the track and we've not seen it.

There's no point in running these engines high, even with aggressive cam timing, power falls off at higher RPMs.

 

I would lower it to 13750. Bike doesn't make more power and your possibly asking for split crank trouble. Both stock and built motors.

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Decision made; I decided to keep the stock rev limit. Thanks for the input guys.

 

I've noticed all the panic seems to be from EDR I haven't really heard about cranks snapping or crank case wear from anyone else but it makes me wonder