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post #1 of 23 Old 06-08-2010, 03:23 PM Thread Starter
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RPM question

Hi. This might seem like a dumb question, but, what is a good RPM to keep at when cruising? I'm still getting use to the Wee, and coming from a KLR. Someone told me, that 4k and below would lung the motor. I try to keep it between 4.5 and 6 thousand RPM. I'm looking for the best for the motor and fuel economy.

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post #2 of 23 Old 06-08-2010, 03:26 PM
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That engine will do 7000 rpm all day long with no problems. The sweet spot starts at 6000. I'm higher geared so most of my time on the freeway is spent about 5800

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post #3 of 23 Old 06-08-2010, 03:26 PM
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Most engines I've had over the years, regardless of what they have been in, tended to run best about the middle of the RPM range.

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post #4 of 23 Old 06-08-2010, 04:09 PM
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Quote:
Originally Posted by classact68 View Post
Hi. This might seem like a dumb question, but, what is a good RPM to keep at when cruising? I'm still getting use to the Wee, and coming from a KLR. Someone told me, that 4k and below would lung the motor. I try to keep it between 4.5 and 6 thousand RPM. I'm looking for the best for the motor and fuel economy.

Classy
my 650 experience had me keeping rpm above 4500 solo, and above 5000 2up
to have reasonable power on tap, and best fuel economy came when I cruised at those rpms



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post #5 of 23 Old 06-08-2010, 05:48 PM
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Quote:
Most engines I've had over the years, regardless of what they have been in, tended to run best about the middle of the RPM range.
I agree Middle of the RPM range.

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post #6 of 23 Old 06-08-2010, 06:01 PM
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As often as I see this question, it always amazes me that it gets asked. It's your ride, do what you like.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #7 of 23 Old 06-08-2010, 06:37 PM
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Quote:
Originally Posted by classact68 View Post
Hi. This might seem like a dumb question, but, what is a good RPM to keep at when cruising? I'm still getting use to the Wee, and coming from a KLR. Someone told me, that 4k and below would lung the motor. I try to keep it between 4.5 and 6 thousand RPM. I'm looking for the best for the motor and fuel economy.

Classy
No dumb questions here, just varying levels of tolerance due to varying levels of experience. 4.5 will give you good economy and 6 will give you the ability to accelerate out of trouble. And it's lug not lung.

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post #8 of 23 Old 06-08-2010, 10:16 PM
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I also came from a KLR...I found my Vee fairly simular for cruising rpm's,right around the 5000 mark.If your bike is brand new there pretty tight and will loosen up after a while and you'll find the rpm's squeeking up a tad more...:mrgreen:
I have no problem pretending im an HD poser putting around at 3000 in 2nd though...lol

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post #9 of 23 Old 06-09-2010, 01:43 PM
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#1. It's not a dumb question...some folks just aren't sure what an engine is capable of.

#2. Engineers figure red line based on piston speed and inertial loading of the crank and rod bearing, valve spring float, connecting rod stretch, etc. By setting a red line on an engine, engineers are telling you it's OK to run up to that speed and stay there for the life of the engine because that's what the internal parts of our engine design will tolerate before something reaches a breaking point.

Now that being said, yes it'll shorten the life of your engine to some degree to run it at red line all the time. The increased forces will simply wear the bearings out faster, cases develop microscopic cracks from increased forces, etc. This is why NASCAR engines may go 500 miles at 9000 RPM then be low on compression and smoking. They wouldn't go 200,000 miles like your family car will, if they stayed at 9000 all the time.

#3. Ride your bike and enjoy it. You'll be tired of your strom long before you wear it out or break it by riding it at highway speeds.
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post #10 of 23 Old 06-09-2010, 11:24 PM
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In between 5K and 8K the torque curve is almost flat. HP peaks about 8.5K.
I too sometimes do that HD imitation at 3K putting about the back roads.
Whatever feels good at the time is best for me but I have never hit the rev limiter...no point IMHO.

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