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Old 05-21-2008, 01:11 PM   #41
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So this is something weird, but not something that is going to damage my 2fiddy?
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Old 05-21-2008, 01:56 PM   #42
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Running the engine at 9k rpms shouldn't hurt it. But if the reason it's now running 1k rpm higher at the same speed is because the clutch is slipping, that needs attention. That's why it's important to figure out what exactly is going on.
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Old 05-23-2008, 07:03 PM   #43
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Okay so bm0r3n0 just reported that his 2fiddy is doing the same thing...the same RPMs @ the same speeds as mine. This make me think 1 of 2 things...it is the heat and the 2fiddy doesn't like the heat or it's something wrong w/at least 2 2fiddys :dontknow:

From what I can see online these are the only 2 accounts of this problem I can find. So people aren't paying attention or not speaking up. Anyone want to trade a 600 for a 250? j/k
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Old 05-23-2008, 07:32 PM   #44
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you probably have a tail wind going to work... and a head wind going home.
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Old 05-23-2008, 08:34 PM   #45
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Quote:
Originally Posted by GQ* View Post

From what I can see online these are the only 2 accounts of this problem I can find. So people aren't paying attention or not speaking up. Anyone want to trade a 600 for a 250? j/k
Ride that thing for a while. At the last lstd event an instructor was schooling a guy on a 600 during the mock race with an 08 250
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Old 05-23-2008, 11:39 PM   #46
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I was joking, I love my 2fiddy, plan on keeping her when I do step up to a 600...just wish I could figure this problem out and hope it's not really b/c it's "too hot" since it's not even summer yet!
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Old 05-25-2008, 07:05 PM   #47
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"Bull - the engine/tire is rotating the same number of rpms to hit 70 mph at 50 degrees as it is at 90 degrees temp."

temperature, wind, or an incline have no effect on rpms at any speed, with the exception of a slipping clutch.

seeing that you are not the only one with this problem, my quess would be that the temperature or humidity is affecting you vehicle speed sensor. most motorcycles have a magnetic sensor that detects how fast the front sprocket is turning. since there is now physical connection it is easy to be incorrect.

I say get a gps or a car and see if your going 70 at 8.5k, at 9.5k or both, and go from there.
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Old 05-25-2008, 10:52 PM   #48
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don't rule out temperature related mechanical problems clutch slipping could be related to temps and oil viscosity friction material responds differently at different temps as well( yes I know it would take extremes for it to show)
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Old 05-25-2008, 10:58 PM   #49
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but wouldn't it be a big 'WOW' that (2) 250s are having the same problem. My 250 is doing the same thing, as reported by GQ*
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Old 05-25-2008, 11:21 PM   #50
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you might wanna try this website. it lets you put in the rpm amount and gives you the speed you're going.

http://faq.ninja250.org/speed/

and its only for the ninja 250s
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Old 05-25-2008, 11:34 PM   #51
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Quote:
Originally Posted by tommyg View Post
you might wanna try this website. it lets you put in the rpm amount and gives you the speed you're going.

http://faq.ninja250.org/speed/

and its only for the ninja 250s
Thanks tommyg...i put in 9000 rpm and it said the speed was suppose to be 70 mph...still....im wondering!
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Old 05-26-2008, 09:33 PM   #52
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Quote:
Originally Posted by bm0r3n0 View Post
Thanks tommyg...i put in 9000 rpm and it said the speed was suppose to be 70 mph...still....im wondering!
ya i know what you mean. i ride a 06 ninja 250 and it reads 9-9.5 when the speedo says 75. i hope its the heat affecting it and not something mechanical.
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Old 05-27-2008, 08:05 AM   #53
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Here's an update...went down to G-town Sunday and the RPMs were up again...was next to a buddy doin 70 and so was he...then I got in front of him for a good 10-15 min will my speedo said I was doin 80-85 his said 75-80. So why would my speedo read a higher speed w/higher RPMs? Since I'm not going as fast as the speedo says wouldn't my RPMs be lower? Also when I was going 70 @ the same time the cage was doin 70 my RPMs were still higher than they normally are....this is getting old fast!
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