Anyone have "flutter" at 4,500-5,000 rpm? - K-Bikes.com - Excellence in Motion
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post #1 of 28 (permalink) Old Jul 28th, 2008, 10:24 pm Thread Starter
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Anyone have "flutter" at 4,500-5,000 rpm?

Anyone have a flutter at 4,500 to 5,000 rpm? This is different than the ever-present 3k "flat-spot" because this flutter seems to hit as a "wave"- it kind of kicks power down, then WHAM!- back in. Almost threw me off the first time it happened.

It happend quite often, maybe not every time, but frequently....

I'm tempted to do a TPS reset.....
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post #2 of 28 (permalink) Old Jul 28th, 2008, 11:35 pm
 
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Doesn't ring a bell.

All by itself, eh? Weird. I guess a TPS reset is pretty easy troubleshooting, all things considered.
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post #3 of 28 (permalink) Old Jul 29th, 2008, 2:22 am
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I get a flutter in my nutsack at those revs but only cause I know whats coming!

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post #4 of 28 (permalink) Old Jul 29th, 2008, 7:10 am
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Quote:
Originally Posted by Brahma
Anyone have a flutter at 4,500 to 5,000 rpm? This is different than the ever-present 3k "flat-spot" because this flutter seems to hit as a "wave"- it kind of kicks power down, then WHAM!- back in. Almost threw me off the first time it happened.

It happend quite often, maybe not every time, but frequently....

I'm tempted to do a TPS reset.....
That sounds like what I had on my 07 KS. Pulling out from a stop in 1st gear the bike would buck like it wasn't getting any gas. Sometimes it would do it 5 times in a matter of 3 seconds. It also did it when accelerating quickly from a stop. The bike would reach maybe 7K rpm and then WHAM down to 3K rpm and then WHAM back up to 7K rpms. This was a violent and very unsafe action that happened in about 1 second. You are correct in that it would almost throw you off the bike.
I took the bike in twice. The first time they found nothing wrong. I showed the dealer how to replicate the problem. After contacting BMW NA, the dealer replaced the fuel tank, ecu, spark plugs, fuel filter, and some other things. (I don't have the service report.) They also exchanged the fuel tank (not the problem). This all took 28 days.
The problem has not surfaced again. The dealer can not pinpoint what the actual problem was, but it seems to be gone. My uneducated guess would be the ecu. I now have the BMS KP ecu with updated software. I still have a problem with the bike stalling at stops sometimes. It usually happens when I make quick stops.

07 BMW K1200 S (cosmic blue/titan silver)
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post #5 of 28 (permalink) Old Jul 29th, 2008, 10:25 am
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Quote:
Originally Posted by Brahma
Anyone have a flutter at 4,500 to 5,000 rpm? This is different than the ever-present 3k "flat-spot" because this flutter seems to hit as a "wave"- it kind of kicks power down, then WHAM!- back in. Almost threw me off the first time it happened.

It happend quite often, maybe not every time, but frequently....

I'm tempted to do a TPS reset.....
I haven't seen anything like what you describe.

I don't know if it matters, but my K1200GT has a buzzing vibration at the exact same RPMs. The vibrations have decreased significantly as the bike has broken in over the last year.
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post #6 of 28 (permalink) Old Jul 29th, 2008, 11:37 am
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I get the "nutsack flutter".

Chris
NS, Canada

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post #7 of 28 (permalink) Old Jul 29th, 2008, 11:50 am
 
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Quote:
Originally Posted by XMagnaRider
I haven't seen anything like what you describe.

I don't know if it matters, but my K1200GT has a buzzing vibration at the exact same RPMs. The vibrations have decreased significantly as the bike has broken in over the last year.

+1. I've got a good high frequency "buzz" around 4700-5000 rpms or so. So I just got faster! Problems solved.
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post #8 of 28 (permalink) Old Jul 31st, 2008, 10:18 pm Thread Starter
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Quote:
Originally Posted by Brahma
Anyone have a flutter at 4,500 to 5,000 rpm? This is different than the ever-present 3k "flat-spot" because this flutter seems to hit as a "wave"- it kind of kicks power down, then WHAM!- back in. Almost threw me off the first time it happened.

It happend quite often, maybe not every time, but frequently....

I'm tempted to do a TPS reset.....
So, as an update, I had GT out today, and riding in 5th gear on the freeway at 70 mph, my bike is at a clear 4,250 rpm on the tach. If I CRANK it, the bike bogs down- practially decelerates, then picks up again. If I go slow up from 4,250, it seems to be fine. I can duplicate this as many times as I need, and it is disheartening.

To me,this feels and seems like a vacuum leak of older cars-it stil lruns fine untl you crank it, and it sputters and then picks up.

I had my airbox changed, and wonder if my vacuum lines are in order.

Opinions?

B.
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post #9 of 28 (permalink) Old Aug 1st, 2008, 5:59 am
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Brahma, my GT has had every problem known and i dont suffer the one you describe. I have a distinct power range on mine once it gets near 7000rpm and definite hesitation sometimes when in too high a gear at lower revs but definitely no "fade" as you describe.
Did it happen before you had the airbox done?

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10 R1200RTSE
02 R1100S
07 K1200GT R.I.P.
86 K100RS Sold
07 R1200GSA Sold
07 Softail Heritage Sold
86 K100RS Sold
82 R100RS Sold
82 Suzi GSX1100 Sold
75 Honda 750/4 Sold
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post #10 of 28 (permalink) Old Aug 1st, 2008, 8:52 am
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Quote:
Originally Posted by Brahma
So, as an update, I had GT out today, and riding in 5th gear on the freeway at 70 mph, my bike is at a clear 4,250 rpm on the tach. If I CRANK it, the bike bogs down- practially decelerates, then picks up again. If I go slow up from 4,250, it seems to be fine. I can duplicate this as many times as I need, and it is disheartening.

To me,this feels and seems like a vacuum leak of older cars-it stil lruns fine untl you crank it, and it sputters and then picks up.

I had my airbox changed, and wonder if my vacuum lines are in order.

Opinions?

B.
Drop a gear, or two, then nail it. I bet you're doing this from 6th.

-=grif=-
What was that middle thang?
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