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Old 05-20-2008, 02:59 PM   #1
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RPM Question...

I have been noticing that since last week when I am going home from work on the Ninja the RPMs are @ about 9 - 9.5 while cruisin 70...well this bothers me b/c they are normally sitting about 8 - 8.5 when doing 70 and have been when coming to work those same days.

Anyone have any clue why this would be happening? The only thing that's consistently different is the temperature. :dontknow:

What you guys think?
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Old 05-20-2008, 03:00 PM   #2
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you've gained weight

Temperature.
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Old 05-20-2008, 03:02 PM   #3
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Quote:
Originally Posted by BigComfy View Post
you've gained weight

Temperature.




Well it's going to be hotter cause your revving higher to get the same speeds obviously. thats a big jump just all of a sudden. Sure someone didn't change your sprockets out while you were sleeping?
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Old 05-20-2008, 03:03 PM   #4
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check your tires (air pressure)
Check your brakes
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Old 05-20-2008, 03:08 PM   #5
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I don't mean the bike is hotter, I meant the only thing that was always different was that it was 90+ on the way home and in the 60/70's on the way in.....and I'm working on the weight issue

Tires are good...sprocket hasn't been changed...brakes are good...

I rode to work yesterday and the RPMs were normal, no the way home they were high, on the way to work this morning..you guessed it, normal again...:dontknow:
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Old 05-20-2008, 03:08 PM   #6
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Different gear?
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Old 05-20-2008, 03:09 PM   #7
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mine is at about 6k at 70
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Old 05-20-2008, 03:10 PM   #8
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Quote:
Originally Posted by GQ* View Post
I don't mean the bike is hotter, I meant the only thing that was always different was that it was 90+ on the way home and in the 60/70's on the way in.....and I'm working on the weight issue

Tires are good...sprocket hasn't been changed...brakes are good...

I rode to work yesterday and the RPMs were normal, no the way home they were high, on the way to work this morning..you guessed it, normal again...:dontknow:

Reminds me of when I was a kid. I had to walk 7 miles up the hill in the snow to go to school in the morning. And then after school I would have to walk 7 miles up the hill in the snow to go home
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Old 05-20-2008, 03:11 PM   #9
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Quote:
Originally Posted by GQ* View Post
I don't mean the bike is hotter, I meant the only thing that was always different was that it was 90+ on the way home and in the 60/70's on the way in.....and I'm working on the weight issue

Tires are good...sprocket hasn't been changed...brakes are good...

I rode to work yesterday and the RPMs were normal, no the way home they were high, on the way to work this morning..you guessed it, normal again...:dontknow:
:/: wind?
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Old 05-20-2008, 03:14 PM   #10
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I'm in 6th (I make sure), the wind has been blowing harder than the past week and I have still been @ 8-8.5k RPMs @ 70 mph

Comfy...how the ?
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Old 05-20-2008, 03:16 PM   #11
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Take it back to Kawi and see what they say


It does not make any sense to me
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Old 05-20-2008, 03:24 PM   #12
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Lower air pressure in the tires can make the rpms go up. But RPMS are directly related to the speed of the tire but that seems excessive. Maybe you thought you were in the top gear but were actually a gear down. Count your shifts. Maybe a bolt in the case worked loose on the shift drum and it won't get into top gear now. My friends bike did that. Either that or the clutch is slipping due to poor adjustment.
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Old 05-20-2008, 03:31 PM   #13
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Mechanically, the rpm's should be the same in the morning and the afternoon for the same speed. If for some reason your rear tire was really low in the afternoon that might account for it, but I don't think it would be a 1k rpm difference. Besides, air will expand when it gets warmer like in the afternoon and if anything you'd run a lower rpm due to it.

Get someone to pace you in the morning and evening to see if your speedometer is consistent. If there isn't a difference in your actual speed and the speedo between the morning and afternoon, your clutch may be slipping a bit or the tach could be reading wrong. If there is a difference, the speedo may be reading incorrectly. You could also get a GPS and check your speed more accurately with that.
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Old 05-20-2008, 03:31 PM   #14
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Quote:
Originally Posted by BigComfy View Post
Reminds me of when I was a kid. I had to walk 7 miles up the hill in the snow to go to school in the morning. And then after school I would have to walk 7 miles up the hill in the snow to go home
You went to school with my mom it sounds like.
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Old 05-20-2008, 03:39 PM   #15
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That's quite a significant difference. And since it changes from morning to afternoon consistantly, you can rule out all mechanical components.

As for air pressure, it should expand/ contract that extreme unless the temp difference is greater then say 20 deg morn/night.

I be interested in whether your pick up signal is creating more resistance when the temperature goes up. does the exhaust sound the same or is the engine really higher?
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Old 05-20-2008, 03:44 PM   #16
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Quote:
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That's quite a significant difference. And since it changes from morning to afternoon consistantly, you can rule out all mechanical components.

As for air pressure, it should expand/ contract that extreme unless the temp difference is greater then say 20 deg morn/night.

I be interested in whether your pick up signal is creating more resistance when the temperature goes up. does the exhaust sound the same or is the engine really higher?
I dont know if you can hear a 250 at 70
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i think mckee is psychoninja's , ask psychoninja if mckee can take it
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Old 05-20-2008, 03:45 PM   #17
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or vibrations then... something to determine whether the engine really is working harder or not... that would help us determine whether it is a gauge problem(sensor or a cable) or an actual mechanical situation(engine,trans--less likely)
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Old 05-20-2008, 03:46 PM   #18
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Old 05-20-2008, 03:49 PM   #19
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I think it is a sensor problem it has a warranty on it take it to the dealer get them to test it and fix it
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i think mckee is psychoninja's , ask psychoninja if mckee can take it
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Old 05-20-2008, 03:54 PM   #20
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Well I can hear the engine revving higher (yes you can hear her screamin on the freeway...when you're on her ) along w/seeing the RPMs are higher. I'm gonna see what happens on the way home today...if she's still working harder then I'm gonna go by the Kawi dealer on the way home...

This blows.
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