fish_antlers
Administrator
The Truth is Out There
Posts: 21895
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posted March 13, 2006 08:27 AM
The 4K "flat spot"?
Now, I have to say that I never noticed this... Personally I dont spend that much time at 4K let alone 6 K... I wind a bike out, cuz that's what it was made to do IMHO...
so... my question is this... just what ARE you doing at 4K? 4K was the launch RPM so dragracing yer above it... street riding the only time you;d see 4K would be lugging the poor engine in 6th at 60mph-ish...
perhaps someone confused lugging the engine with a flat-spot?
I never felt it... guess we need to get some owners out there to report back...
But I do ask... 4K? Whatcha doin at 4K anyway?
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What business is it of yours where I'm from, Friendo?
   
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vegasdude
Zone Head
Posts: 821
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posted March 13, 2006 08:37 AM
 Edited By: vegasdude on 13 Mar 2006 08:39
Sounds like the gearing is lower in the 14 than the busa, if it's doing 60 or so in 6th at 4 grand. At corrected speed the busa is doing 70 at 4 grand. The 14 should have more than enough torque to be at 4 grand in 6th. The busa sure does..............
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zerMATT
Pro
Posts: 1931
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posted March 13, 2006 09:22 AM
Edited By: zerMATT on 13 Mar 2006 09:23
I think the "flat spot" was brought up because of some dyno charts that showed a dip there. I doubt it was from personal experience since pratically nobody but you has ridden the bike, fish  . If you didn't notice it on your road ride, then it's probably not going to bother anyone.
Yeah, 4k rpm in 6th gear is really only going to be an in-town highway thing on occasion. If I'm just coasting with traffic, I'll have it in 6th at 60 or 70, but otherwise I'm going 75+ on highways so a "flat spot" at 4k shouldn't be an issue.
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'06 Passion Red ZX-14 | Black D&D Slip-ons | Speedo Healer | V1 | zumo 550 | Heli-Risers | PhantomX
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marco383
Expert Class
Posts: 145
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posted March 13, 2006 09:40 AM
I think that it's a fair assumption that a Power Commander and some tuning will minimize or even eliminate any flat spots. I've been reading about "flat spots" caused by removing the valve in the exhaust system when going aftermarket on one litre sportbikes since 1998. Damned if I ever could find one.
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zxlnt
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted March 13, 2006 09:49 AM
Sounds like its the same flat spot ZX11's had. I do know that if your taking off from a stop and turning a corner that lots of time you come up around 3-4K right in mid corner. My ZX11 would clear up right past 3K mid corner, it was quite interesting at times when it did, and you didn't even have to be on the gas very much at all....
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blueford
Needs a job
Posts: 2984
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posted March 13, 2006 10:29 AM
Edited By: blueford on 13 Mar 2006 10:30
Flat spot! Shit, lets not forget how incredible TODAYS machines are, here's where I started and I thought that was incredible! 
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marco383
Expert Class
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posted March 13, 2006 12:53 PM
Anyone ever tell you that you look a lot like Steve McQueen?
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fish_antlers
Administrator
The Truth is Out There
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posted March 13, 2006 01:17 PM
"that's hot"
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What business is it of yours where I'm from, Friendo?
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speedgene
Zone Head
Posts: 996
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posted March 13, 2006 02:49 PM
Don't get me wrong, I'll take a 200HP production bike any day of the week... even if they couldn't get it out, and coined it (flat spot) FS-14.
It's all speculation as far as I'm concerned. I'll take the bike "as is" thank you.
The first few days of ownership will trickle in with (field) reports.
It will be too high an rpm for some to chance recommended break-in? At least those on the other side of break-in will report for sure.
I'll have the bike the same day as most, but the bike will be down. I can hardly wait for the dinner bell (mail signal) to ring on the garage PC. Call it a lunch break away from the 14.
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E-tard
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jimzx9r
Expert Class
Posts: 451
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posted March 13, 2006 03:03 PM
4k rpms is plenty low for the break in. The best thing to do is vary the rpms, cruise around in a few different gears...giving it some gas and playing around. I wouldn't be going over 8k rpms for a few hundred miles, though. Then again, I know of drag racers that pick bikes up at the dealer, load them on a trailer and go straight to the strip. I've never heard of a motor blowing prematurely due to not following the break in procedure. Some of those beaten to death motors actually dyno higher than others that did get the recommended break in. Just make sure to change the oil when the manufacturer recommends.
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speedgene
Zone Head
Posts: 996
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posted March 13, 2006 03:28 PM
"so... my question is this... just what ARE you doing at 4K?"
The locals here might know Stunt Road? Some of those turns (going up hill) might need a first gear (two up riding= HP weight change) pull. Last thing I need is a surprise going up some strange canyon.
I know a part of HWY 1 that is an easy 160 (using both lanes..plus a little) through a section of big sweeping S changes. Kinked over at 4K feed?... not fun if I have to hunt up or down is the problem. Ideally, any stumble rpm feed needs a cleaning.
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E-tard
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Ozzy
Needs a job
need guberment cheese
Posts: 3172
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posted March 13, 2006 06:17 PM
quote:
Sounds like its the same flat spot ZX11's had. I do know that if your taking off from a stop and turning a corner that lots of time you come up around 3-4K right in mid corner. My ZX11 would clear up right past 3K mid corner, it was quite interesting at times when it did, and you didn't even have to be on the gas very much at all....
Dam, you look just like Steve McQueen!
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aughtsix
Expert Class
Posts: 277
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posted March 13, 2006 06:19 PM
The infamous 4k flat spot is most likely the same problem that has plagued imported bikes since, well, bikes were imported. It's the inevitable result of the factory(s) lean tuning for the 'cruise rpm' emissions test. Off the top of my head I can't recall a bike I've purchased new that hasn't had this same issue. Then again, back in the 'ol days you could just put a shim or two under the needles and presto, problem solved.
It's a 'get over it' issue...
One of the many drawbacks of modern fuel injection is that you can't just shim the needles - and I'm one who absolutely refuses to run a power confounder.
YMMV...
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CrotchRocket
Moderator
Bracket Racing with Betsy
Posts: 8038
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posted March 13, 2006 06:30 PM
Launch at 4k with stock gearing???...Fish, no wonder why you went high 11s on the 14 
What would I be doing at 4k, cruising during break in!!!...Thats the only time I will be at 4k...
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Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
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Rubber Pants
Zone Head
Posts: 798
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posted March 13, 2006 07:05 PM
quote:
"that's hot"
What.................................... a flat spot?!!?
I like em BIG!!!!! And ROUND! and FULL!
Now ....."That's Hot"
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"Ya Gotta Have Big Ones!"
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bugsey
Novice Class
Posts: 78
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posted March 14, 2006 12:02 AM
Sometimes 4k is 70 mph cruzing rpm on some bikes....but not sure I understood the question entirely?
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VPN
Zone Head
Posts: 718
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posted March 14, 2006 12:51 AM
Edited By: VPN on 14 Mar 2006 00:51
That Kawasaki was supposed to launch from full stop "in almost any gear"
The earlier dyno looked under 4K the same as the Hayabusa
I'm afraid that there is not enough low rpm torque after all...
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