Just curious what is the max rpms for our somewhat stock evo's?

I know my original rev limiter kicked in at 5200 rpms, now I have the ultima ignition set for 5500.

Just got to thinking what is to much for these motors? I see lots of aftermarket modules (even screamin eagle) that have 6000, 6200, even more.

Had my finger on the 6000 rpm switch, but kept it at 5500. YD

 

You'll be perfectly safe to those revs IMHO. What you will probably find, unless you have other performance mods, is that the engine will be reluctant to rev beyond around 5k. That is partly because it doesn't have much to give, also not having spent much time up there in the past, it may not be run in for those speeds!

A friend bought a secondhand car many years ago, one owner from new. It just wouldn't 'go', so he quizzed the PO. Transpired he had never been out of town or done more than about 50mph! After some careful running in over the upper rev range it was soon maxing out in every gear. You may have to do the same with your bike.

 

more RPMs require lighter valve train parts and in most cases stronger springs on the valves and a HYD lifter that can handle a lot more stress

your good to go 5500 stock parts / 300 RPMs are lost in the feed to the ignition so 5200 stock is really 5500 and so on, by the time you shift the bike to the next gear the engine has gone another 300 RPMs by default skipping on the rev limit switch

 

You're good at 5500 rpm. a stocker will run out of power at that rpm so you'll probably not get there much. basing a motor on what the PO did is not a gauge, It only tells you that if he putted around it might have a little too much carbon build up. So go blow it out and have fun, it'll handle it...

 

IIRC, my Dyna 2000 ignition is set at a 6200 limit. I know I've had it up there once running through the gears. And when it kicked off, it scared the crap outta me. I wouldn't want to run it at 6000 rpms for any length of time. Or 5000 rpm for that matter. Mine is happy-happy at 3200-3700 rpm out on the highway.

 

I have hit my 5200 rpm limiter twice in the 2 years I have owned this bike. I run with mostly twinkies so I have to get the bike wound up every once in a while when we "play".

Good to know about the 300 rpm difference. I was not aware of that.

While I wanted to use the 6000 rpm limit, I am just going to keep it at 5500. Yes, the valve train/lifters are stock.

Maybe I will bump it up to 5800 when and if I ever get or make a data/programming cable, but my current switch options are 5500, then 6000, then 6500, and finally 7000. For now I'm going to leave as is.

BTW, I found an interesting link to a method of being able to adjust timing all from the right side of the bike. Takes a little bit of effort to set up, but when done, it looks like it will make timing easier and faster. This may be old news, but thought I would share.

http://www.wildwestcycle.com/f_timingtrick.html

Thanks for the info. YD

 

Actually your power band in a stocker is gone by 5000 rpm so if you want to keep up with those twinkies an earlier shift will be better than the later...

 

The 5200 rev limit is for EPA exhaust noise. Police bikes had about an 55-5600 limiter,my '86 sometimes felt like it was ready to shift just as the rev limiter hit which was a pain.

 

the reason it did that is the Police machines have the same lifters as a production bike and they are pumping out at 5600 and the motor will continue to spin up but the power is falling off 60 percent at that point -- reason Ultima uses 5500 / then 6000 < starting rev limit for better parts --

be happy with the few rpms more it will make it pull in the next gear with more umph stock cam of a small cam replacement same deal

 

There is a risk breaking rings if the motor is worn in to a 5k limit and you suddenly start exceeding that