October 25th, 2009, 03:00 PM | #1 |
ninjette.org sage
Name: J.G.
Location: Austin
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Is 9000 rpm too much at 70?
2009 - 1800 miles - I'm 150 lbs.
I think I may have a tach or ignition problem (from pass post) - I went for a ride today and keep a mental note of the RPMs - 55 mph about 6200 rpm - 70 mph about 9000 rpm - does this seem high? Doing some research on the forum - I found posts about the tach and the IC ignitor - could I have one of these issues? Bike is still under warranty. |
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October 25th, 2009, 03:31 PM | #2 |
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I usually hit 8000 rpms at 70. I'm around 225lbs......weight will make a difference.
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October 25th, 2009, 04:02 PM | #3 |
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October 25th, 2009, 04:04 PM | #4 |
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70mph @ around 9k rpm doesn't sound like a problem. I wouldn't worry too much.
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October 25th, 2009, 04:11 PM | #5 |
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im at the same. you might want to check your clutch freeplay
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October 25th, 2009, 04:11 PM | #6 |
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I find in top gear, stock gearing, stock tires, my revs are about 1,000 more than my speed. 7000 rpm at 60, 8000 rpm at 70.
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October 25th, 2009, 05:57 PM | #7 |
North Alabama Mtn. ryder
Name: Nate
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put a 15 tooth up front...run at 9k in 6th..smile
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October 25th, 2009, 07:06 PM | #8 |
ninjette.org sage
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I think the tach is just about worthless on these bikes, mine shows anywhere from 7500 to 10k at 70. Seems like ambient temp and bike temp have a role in the different readouts.
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October 25th, 2009, 07:25 PM | #9 |
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Cedilla, that sounds like the infamous CDI problem.
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October 25th, 2009, 07:52 PM | #10 |
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Not sure how much of a difference there is in rpms between the pre-gen and the new-gen. However, on my 1994 ninjette in 6th I run between 1k to 1.5k higher in rpms then mph. So for me at 70 I'm usually around 8500 or so. Since mine is modded for more power it could be you don't have a real problem. But I'm not an expert.
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October 25th, 2009, 07:58 PM | #11 |
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Probably normal, wouldn't worry about it.
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October 25th, 2009, 08:02 PM | #12 |
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Sounds about right to me
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October 25th, 2009, 08:03 PM | #13 |
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After my speeding ticket, I stick strictly to indicated 70 mph on the freeway and the tacho is consistently showing 9,000 rpm.
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October 25th, 2009, 08:16 PM | #14 |
=°°=
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im also 150lbs and at 70mph im at 9000rpms too, so i dont think theres a problem
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October 25th, 2009, 08:23 PM | #15 |
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October 25th, 2009, 11:24 PM | #16 |
ninjette.org sage
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70mph in 6th = 9K really?
I am almost certain that at exactly 70mph I'm never @ 9K... usually below whenever I'm at that speed in that gear and I have not made any sprocket changes either |
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October 26th, 2009, 12:36 AM | #17 |
old git
Name: Steve
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I am not saying that mine was correct but I had 8500 at 75 mph, what is important is that it reads the same every time.
Steve
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October 26th, 2009, 04:19 AM | #18 |
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rider weight ...(the More you weigh, the less your Top Speed will be from a 100 lbs rider off the 100MPH mark)
When i ride 2-UP with dawn on back, my Top end is cut to 90 MPH, solo riding i hit 100 MPH. "IDC about the speedo 10% off thing, blah blah. " |
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October 26th, 2009, 08:26 AM | #19 |
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Does the tach show less revs as well with a passenger. My thought would be the added weight reduces mph as you stated, and then rpm would also be less.
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October 26th, 2009, 08:33 AM | #20 |
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Weight doesn't affect what revs show up on the bike at a particular speed. In fact, nothing affects what revs the engine is turning at a particular speed, other than gearing changes. If the passenger causes you to go slower, then sure, the revs would be lower, but only because the speed was lower the same corresponding amount.
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October 26th, 2009, 09:15 AM | #21 |
CPT Falcon
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October 26th, 2009, 09:41 AM | #22 |
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The biggest problem with the faulty CDI is the rev limiter will cut in sooner, before you're truly at the engine's rev limit!!!!
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October 26th, 2009, 11:11 AM | #23 |
ninjette.org member
Name: Mike
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I have run my Ninja up to 14000rpm and the rev limiter has not cut in. I too believe my tach is reading high. Does the rev limiter work off the tach or the cdi unit? Is it possible the cdi unit could be sending a faulty signal to the tach but the signal could be correct going to the rev limiter?
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October 26th, 2009, 01:18 PM | #24 |
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Mike,
Off hand, I don't remember what the rev limit is; however, a search will probably reveal same. I thought it was like 12,500 RPM. It may be the tach is receiving a bogus signal and the RPMs are really less than the rev limit. When the CDI is bad, the displayed RPMs are higher than the actual RPMs! |
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October 26th, 2009, 02:43 PM | #25 |
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Weight doesn't effect the actual speed your engine is running. 9k at 70 is about a grand too much. That means the tach is reading wrong. This problem is common with a CDI Malfunction.
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October 26th, 2009, 03:10 PM | #26 |
ninjette.org sage
Name: J.G.
Location: Austin
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Good thing it still under warranty - I'm considering the GTPP now - should I have this issue repaired ASAP, or wait until the first major service (with GTPP)? How do I convince the dealer that there is indeed an issue?
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October 26th, 2009, 03:18 PM | #27 |
ninjette.org dude
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Just checked out the www.gearingcommander.com site. With stock gearing and stock tires on a 2008+ ninjette, at 9000 RPM in 6th gear the expected road speed is 73.1 mph. Our tachs have a fudge factor, and our speedos certainly have a fudge factor, so I wouldn't be immediately alarmed. It may be reading a little higher (or a little lower) than other bikes, but it doesn't mean there is anything particularly wrong with the bike. There very well may be. , but this data point alone isn't enough to come to that conclusion.
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October 26th, 2009, 03:34 PM | #28 |
ninjette.org sage
Name: J.G.
Location: Austin
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What other things should I keep an eye out for to help add info. to determine if I have a true problem, or am I just wishing for a 7th gear?
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October 26th, 2009, 03:42 PM | #29 |
ninjette.org dude
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The only likely problem is the CDI issue that seems to affect a number of our bikes. Check the wiki in the troubleshooting section for more detail than you'd ever ask for on the issue. In a nutshell, an overheating CDI causes the tach to do screwy things. Read higher when warm. In some bikes, that is accompanied by running problems as well, while on some bikes the problem seems to be exclusively a display problem on the tach. So if you see different engine speeds on the tach at different times of day, even though you're going the exact same speed on the speedo and are in the same gear, then perhaps you're experiencing the CDI issue.
But it's not likely. The ninjette runs high revs on the highway. With only a small handful of torque, it has to in order to have nearly enough horsepower to push us down the road at highway speeds. It's just the nature of the machine. Some folks do put on a larger sprocket in front to gear the bike a little taller, and lower revs somewhat on the highway, but it's not going to be a night and day difference.
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October 26th, 2009, 03:53 PM | #30 |
ninjette.org sage
Name: J.G.
Location: Austin
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It does seem to read different RPMs as the heat goes up (guessing without a temp gauge), but the RPMs do seem to differ as the ride progresses. I will check out the wiki, thanks.
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October 26th, 2009, 06:46 PM | #31 |
ninjette.org sage
Name: Chris
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Ill have to look into this as well, I just figured the tachs were garbage. Can the faulty CDI mess anything else up? My tach as not been reading right since day one, and it otherwise runs fine, the tach being off does not bother me much though.
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October 26th, 2009, 08:19 PM | #32 | ||
ninjette.org sage
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Quote:
Quote:
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October 26th, 2009, 08:27 PM | #33 |
CPT Falcon
Name: J.Emmett Turner
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October 27th, 2009, 03:45 AM | #34 | |
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Quote:
Converted, it ALWAYS reads 6000 RPM at 50, whether hot or cold! The rev limiter is set higher than I want to take it! Check out the DIY CDI conversion: http://www.ninjette.org/forums/showthread.php?t=26765 |
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October 27th, 2009, 08:28 AM | #35 | |
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Quote:
Another way to think of it is riding a single speed bicycle. If my legs spin the crank at 60 rpm and I can go 20 mph, then a passenger gets on the bicycle, the added weight reduces my crank rpm to 30 rpm and my speed drops to 10 mph. Not real numbers but just to make a point. |
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October 27th, 2009, 08:50 AM | #36 | |
CPT Falcon
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Quote:
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October 27th, 2009, 08:57 AM | #37 |
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That is what I am saying revs and mph (assuming same gear) move together. Adding a passenger (weight) puts more load on the engine thus reducing revs and mph. The same is true climbing a hill - revs and mph increase more slowly. Going down a hill revs and mph increase quicker.
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October 27th, 2009, 09:15 AM | #38 |
CPT Falcon
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No one's saying you're wrong. It's just clouding things up. Going up hill, you slow down. Going down hill, you speed up. Speed is what is relevant to RPMs... not the hills causing it. That means that they are a distracting/irrelevant detail. Lots of things other than weight or grade can slow you down by sapping power (or speed you up by reducing strain), including headwinds/tailwinds, elevation, etc.
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October 27th, 2009, 09:17 AM | #39 | |
ninjette.org sage
Name: Josh
Location: Richmond VA
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Quote:
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October 27th, 2009, 09:28 AM | #40 |
ninjette.org certified postwhore
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A corner can also cause a change in rpm. As the bike is leaned and the tire is put on edge, the effective diameter changes, thereby changing the effective ratio. Probably not noticeable on the road, unless fully tapped before and through the corner.
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