Highway rpm's - Kawasaki KLR 650 Forum
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post #1 of 15 Old 04-11-2010, 09:17 PM Thread Starter
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Highway rpm's

Hi, I'm wondering if cruising at 65 mph at approx. 4,300 or more rpm's is safe for the engine? How far can I go for extended periods of time? Maybe at 70 mph, which I think would be my very upward limit. Can I do 5,000 rpm for extended periods of time safely?

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Jose Gonzalez
Guatemala
2001 KLR 650
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post #2 of 15 Old 04-11-2010, 09:21 PM
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That sounds normal...not the most fun way to ride, but it's fine.

I've done 85 mph for hours on end (not fun either). You'll get a lot of vibration, but 70 mph should be no problem.




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

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post #3 of 15 Old 04-11-2010, 09:33 PM Thread Starter
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Thanks, I'm not planning to do 70 for many hours, but wanted to know if I could do it without any problems other than the vibration.

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post #4 of 15 Old 04-11-2010, 10:09 PM
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The motor will have no problem running at 5000 rpm as long as you want to. Running at or above 5000 rpms can cause some oil consumption. Just check the oil at gas stops and don't let it get low.
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post #5 of 15 Old 04-11-2010, 10:45 PM
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Thanks SLO and Lockjaw, I too was wondering the same thing before I ventured out on my first excursion. That basic information is just what us KLR beginners need to know. I'm looking to do a run from Sunspot, NM down through the forest service roads and dry creekbeds all the way to Carlsbad Caverns. I need to know what type of supplies for a ride like that will be needed. I know a first aid kit and water are essential.
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post #6 of 15 Old 04-12-2010, 12:22 AM
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In case you didn't already know, a 16 tooth from sprocket does wonders for superslab travel. I was like, "ahhh, whatever!" whenever I heard about the 16 tooth. But now that I have one I love it! But, the trade off, for me anyways, is that on fire roads and the like the lower gearing is a little off.
On the superslab I shed about 500 RPM. I got mine for about $10.
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post #7 of 15 Old 04-12-2010, 01:46 AM
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I like to operate between 3,500 and 5,000. The speedometer is not correct and can be off as much as 7 MPH.

Agree with John about the 16T counter sprocket. I have used the 16T with two stock 650 engines, one 685 engine (perfect match), and a couple thousand miles with a 705 engine. The 16T allows reasonable freeway speeds between 4,000 and 4,500 RPMs.

Sustained 85 MPH is not on my list of things to do to a 650, 685, or 705 engine. At 85 MPH you would be well over 5,500 RPMs and I do NOT recommend anything sustained over 5,000 RPMs.

Installing a 685 kit we be recommended if you want to rid your engine (and you) of most vibration and extend the engine life.

Tim

2005 KLR 685
2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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post #8 of 15 Old 05-30-2010, 05:22 PM
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Fellows, the engine will tell you when it's in the sweet spot. That's the rpm where is the smoothest. When I first purchased my KLR and before it was equipped with a GPS I also wondered about speed.

My bikes speedo is considerably off. Most of my riding is at 80mph on the speedo but the GPS resisters 69mps and that's her smoothest. If you haven't wicked it up to that speed you'll be amazed at the smoothness.

The only problem I have is surging at speeds above 50mph. It's getting worse and I changed out everything except the carb.
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post #9 of 15 Old 07-02-2010, 06:06 PM
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Surging

Quote:
Originally Posted by Joe Crumley View Post
Fellows, the engine will tell you when it's in the sweet spot. That's the rpm where is the smoothest. When I first purchased my KLR and before it was equipped with a GPS I also wondered about speed.

My bikes speedo is considerably off. Most of my riding is at 80mph on the speedo but the GPS resisters 69mps and that's her smoothest. If you haven't wicked it up to that speed you'll be amazed at the smoothness.

The only problem I have is surging at speeds above 50mph. It's getting worse and I changed out everything except the carb.
If you have opened up the airbox with the L-mod or something similar the CV carb will be "searching" for a steady air flow and cause surging. Put the box back to stock and try it.
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post #10 of 15 Old 07-03-2010, 12:41 AM
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Our 08 and 09 I broke in by the book. I generally ride between 4,000 - 4,500 rpm with stock gearing solo or with the sidecar. When we replaced the chain and sprockets, with the sidecar we kept the stock 15 tooth countershaft sprocket and added 2 teeth the rear for a little more torque in the hills, so far so good, RPM up 500 RPM at cruise is 5,000RPM. I have ridden an 06, later years the 08-09 have considerably less vibration. I am adding the ROX 2" risers with isolators to be able to stand while riding to streach my legs and take a little pressure off the butt. I had herd good things regarding the rubber isolater, more of a curiosity than anything, everything helps.
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