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Old 05-20-2008, 04:07 PM   #21
dasboot
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Quote:
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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.
this is what i suspected. try riding again at that speed in a lower gear and see if the rpm's are what they were the other day. also check to see if you have enough play in your clutch lever.
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Old 05-20-2008, 04:13 PM   #22
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I don't want to try to do 70 in 5th...that's probly put me @ 10k....I'll count them out again on the way home and make sure (again) that I'm in 6th. So if the engine is revving higher does it sound like it's a sensor or something mechanical?
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Old 05-20-2008, 04:41 PM   #23
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Not a sensor. Something mechanical.

Im not familiar at all with those bikes but generally something that would make that much difference at that reproduceable isnt normal... unless its a given characteristic of the bike.

Now if you said it has been doing it regularly, or seems to be higher since your rear tire has been worn down etc... I could understand but to change from morning to afternoon consistantly either the bike is not producing the power efficiently(gas? bike characteristics?) or something else is wrong.

Have you had it to drive in hot months yet? Had it done this last year?
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Old 05-20-2008, 04:44 PM   #24
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It didn't do this last year...I got her fresh out of the crate in March
This is not normal though...only noticed it for the first time last week; and like I said the only thing that stuck in my mind was how hot it was outside.
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Old 05-21-2008, 08:54 AM   #25
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So I dropped by the Kawi dealer on the way home b/c she did it to me again

According to the guys in the service dept it's b/c it's so hot the bike is having to work harder....I was thinking this was the problem since it was the only constant in my afternoon rides, but now that I heard it from them I'm skeptical about how valid this explanation is. I plan to change the front sprocket out and I am going to get my friend to run his 2fiddy in the heat to see what his does. :dontknow:
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Old 05-21-2008, 08:55 AM   #26
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Best course of action... ask others with a 250...

they should be experiencing the same problem if this is known to be normal.
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Old 05-21-2008, 08:57 AM   #27
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Yeah that's pretty much all I can think of right now
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Old 05-21-2008, 08:58 AM   #28
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Only thing I have carburated was the Kan-a-tuna and I never noticed a difference. But maybe its engine size has something to do with it
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Old 05-21-2008, 09:38 AM   #29
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Quote:
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So I dropped by the Kawi dealer on the way home b/c she did it to me again

According to the guys in the service dept it's b/c it's so hot the bike is having to work harder....I was thinking this was the problem since it was the only constant in my afternoon rides, but now that I heard it from them I'm skeptical about how valid this explanation is. I plan to change the front sprocket out and I am going to get my friend to run his 2fiddy in the heat to see what his does. :dontknow:
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.

Someone is jerking you because they don't want to figure out what the real problem is.
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Old 05-21-2008, 09:40 AM   #30
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Well searching around, it looks like this is a problem that many other people are having, but they are being told different things from buy a new tach to that's just how they run....
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Old 05-21-2008, 09:43 AM   #31
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Quote:
Originally Posted by FJRmgm View Post
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.

Someone is jerking you because they don't want to figure out what the real problem is.
That's what I'm thinking
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Old 05-21-2008, 09:45 AM   #32
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It may go back to the heat as you have mentioned and the fact that the engine size is smaller, the air charge to the cylinder is less dense w warmer air and the volume isn't there to draw the gas volume from the bowl to compensate for the increase in temperature.

In other words, the engine's efficiency is affected and the power output is less. Does it seem to lag a little more when its that hot outside? Just curious. If you are running straight on the freeway and close the choke does it make a difference?
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Old 05-21-2008, 09:48 AM   #33
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http://www.ninja250forum.com/index.p...id=27&Itemid=1

^^^someone in there should know
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Old 05-21-2008, 09:53 AM   #34
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Well I don't normally use the choke now that it's warmer so wouldn't that mean it stays closed?

The heat seemed like a good answer to me before it looked like a convenient answer for the shop guys

The bike doesn't lag, just works harder to do what I want her to.
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Old 05-21-2008, 09:54 AM   #35
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Unless there is something different about the 250s, there is a mechanical link between the engine and rear tire. The temperature should not change the rpm/speed. It will affect how much gas you have to give it to get to that speed but wont effect the rpm. There has to be a problem with the bike and the dealer should be able to fix it especially if it is under warranty. Clutch slipping, gauge reading incorrectly, etc.
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Old 05-21-2008, 09:57 AM   #36
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Quote:
Originally Posted by FJRmgm View Post
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.
That's the point I was trying to make earlier. If the bike is in fact revving higher, then the clutch may be slipping or the speedo is reading wrong. If the motor is not revving higher then the tach is wrong.

That's why I said to compare it to another car or a GPS to see if he really is doing 70 in the morning or the evening to rule out the speedo. If that's reading consistently in the morning and the afternoon, then either the clutch is slipping or the tach is wrong. Of course this is all assuming that he is in fact in 6th gear when testing.

It's just a typical process of elimination to find out what is working right and what isn't.
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Old 05-21-2008, 09:57 AM   #37
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[QUOTE=GQ*;1203639]Well I don't normally use the choke now that it's warmer so wouldn't that mean it stays closed?[QUOTE]

When you move the lever down for colder weather you are actually closing the choke, which covers or restricts the throttle so less air comes in. Reason being air is denser when its colder and less is needed when the temperature drops.
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Old 05-21-2008, 10:22 AM   #38
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Oh, I will try to close the choke on the way home then...I guess it's always open. thanx for the clarification

Let me assure everyone that I am in 6th. I counted on the way up to 6th and then on the way down from 6th. I even made sure I couldn't go to a higher gear after cruising for a lil while on the HOV...

So with this going on am I going to be damaging my 2fiddy by cruisin @ 9k or no b/c redline is like 13k??
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Old 05-21-2008, 10:29 AM   #39
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BTW, I rode to work this morning and the RPMs were normal...
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Old 05-21-2008, 01:04 PM   #40
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Quote:
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Oh, I will try to close the choke on the way home then...I guess it's always open. thanx for the clarification

Let me assure everyone that I am in 6th. I counted on the way up to 6th and then on the way down from 6th. I even made sure I couldn't go to a higher gear after cruising for a lil while on the HOV...

So with this going on am I going to be damaging my 2fiddy by cruisin @ 9k or no b/c redline is like 13k??
A choke is usually just needed to get the motor warmed up or started. You shouldn't need it choked once the engine is running and warm. If you leave it choked, you are running the engine richer than the engineers intended for normal operation and wasting fuel/limiting power output.

No, running the engine at 9k (under load) is not going to hurt it. If it did, they would have put the redline at 8k or 8.5k. Companies are not going to let you rev the engine to the point where it will break it, that would increase their warranty repairs and cost them money.
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