look at it this way, the Moco sets up the valve train cylinder heads and Pistons so you have at least a hundred thousands clearance between the valve in the Pistons on a stock motor. Now if you over rev the motor and float a valve, I doubt you're going to get piston to valve contact because there's just too much clearance built-in from the MOCO.
Now for a little performance upgrade and With that you shave your heads .050" and 0 deck the cylinders and then you put an adjustable pushrods, a bigger cam now your setting preload to .130" to help quiet things downd that leaves you say .070" cushion on the lifter and who knows what your valve to piston is unless you clay it and check it all out. So Say you have. 060" valve to piston which is what my builder uses for a comfortable cushion.

Now under normal driving circumstances that's fine you'll get by and never have any issues but if you do over rev the motor and Float a valve you have a very good chance of that valve contacting the Piston because you're hundred and thirty thousand preload now disappears when that lifter pump pumps up from being floated and where do you think that's going to be made up? At the total lift of the valve and where's that piston going to be. Bang.....don't forget you only set it up for .060" clearance and with that preload of .130" a floated valve has no chance... So yes. Using a rev limiter on a built motor is very important. On a stock motor not so...

 

 

Through all the lessons I've learned in the past decade or so I've found that shifting at 5500 puts you right back in the real power zone... You need to remember that torque gets you there and horse power only maintains...

 

Are we Racin here???
Or just takin a putt on an antique Harley???

 

 

 

 

I dunno... I must be old, but I rarely see 80 mph. Only when pushed by traffic and the need to get out of harms way. I can (and have) cruised 70-75 mph for 10+ hours on my 93 FLHS, That's somewhere in the 3200-3500 rpm range (really hard for an old guy to see the small tach markings at speed), with the occasional blasts to 80-85 to get around traffic. Oh, and my Dyna 2000 ignition is set for around 6000 rpm rev limit. And I've hit it a couple of times 'showing off', but never trying to set a world land speed record. I've done 2 up at 110, and afterwards I realized what an idiot I was....

But to reply to your post, it's not going to hurt the EVO to run at 80 mph all day long.

 

Getting back on the bike after a couple decades of not having one, I'm one of those people that tends to lug the motor. After reading this thread earlier in the week, and making changes to my riding habits, I found the bike performs much better at higher rpm's. I'm also thinking the bikes getting better gas mileage.
Does that make sense? My Road King's fuel injected.
I was always under the thought that the lower the rpm the better the fuel mileage. Especially on fuel injected engines.