919 runs rough around 2500-3500 rpm. - Wrist Twisters
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post #1 of 52 Old 07-12-2012, 09:35 AM Thread Starter
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Exclamation 919 runs rough around 2500-3500 rpm.

Hi I bought a 2002 919 about 2 weeks ago, changed the oil and some other stuff and Ive put a little over a thousand miles on it. The bike starts fine and idles right around 1100rpm. It does fine at high rpm and highway speed (45-up) but when cruising around town whenever I get to about 2500rpm it starts to hiccup. The bike will buck. you can hear it and feel it. It only happens from 25-3500 rpm and if youre easy on the throttle. If you pull harder it goes through with no problems. no FI light or anything.
The bike has also been giving off a strong gasoline odor which makes me think there is unused fuel in the exhaust thus issues with spark. if anyone has any ideas id really appreciate it!

Gonna change the plugs this weekend.

Spark plugs maybe ? or Ecu?

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post #2 of 52 Old 07-12-2012, 09:40 AM
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The throttle is very jerky on the 919 at low speeds (small throttle opening in lower gears). You can smooth it out with a power commander and a new fuel map. To me it sounds normal.

The gasoline smell is also normal, the 919 comes from the factory very rich. All my jackets smell like a gas can.

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post #3 of 52 Old 07-12-2012, 09:51 AM
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My '04 surges between 3000 and 3500 with 1/8 to 1/4 throttle, its not a huge bucking surge just a small annoying surge. It gets worse the lower the fuel level gets

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post #4 of 52 Old 07-12-2012, 10:02 AM Thread Starter
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This sounds very similar to my issue. is there anything to do about the fuel smell? would the map sensor help?

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post #5 of 52 Old 07-12-2012, 10:19 AM
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I don't think anyones ever solved the stink issue, sometimes mine stinks sometimes it doesn't

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post #6 of 52 Old 07-12-2012, 10:20 AM
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Take a look at the power band/curve on a 919. You might want to start riding it at an rpm a little higher than 2500.

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post #7 of 52 Old 07-12-2012, 11:05 AM Thread Starter
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lol ill have to try that.

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post #8 of 52 Old 07-12-2012, 11:34 AM
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hmm.... i dont know what you guys are talking about.... the 919 shouldnt buck or anything at any rpm.

Ill agree from completly off to small throttle its a little jerky.... but past that it should run smooth.

Its very possible that your FPR is going bad if your having actual stumbling.

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post #9 of 52 Old 07-12-2012, 11:37 AM
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Mine isn't a stumble or a jerk but a surge when riding a a steady speed between 3000-3500 rpm with light throttle settings

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post #10 of 52 Old 07-12-2012, 11:53 AM
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Quote:
Originally Posted by nd4spdbh View Post
hmm.... i dont know what you guys are talking about.... the 919 shouldnt buck or anything at any rpm.
+1 - Even at low RPM I've never had any kind of "bucking" sensation.

Also, I'd turn up the idle to about 1200-1300 - that's where my '02 seems to like it best. At that idle I don't ever have to even pull the choke in the morning.

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post #11 of 52 Old 07-12-2012, 11:55 AM
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An FPR could be at play alone or also involved.

If at 2500 and warm engine in creepy crawly 1st gear mode with barely cracked throttle, then I'd expect to be the inherent crap factory mapping in that zone of the % TP x RPM co-ordinate map, as likely aggravated by excessive throttle cable slack.

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post #12 of 52 Old 07-12-2012, 12:05 PM
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Mine def will buck if I'm creeping around at 2500 RPM, I think that's his problem. I learned quickly not to ride it in that rev range, no problems anymore.

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post #13 of 52 Old 07-12-2012, 12:45 PM
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I noticed that after I did the PAIRS removal and the Flapper mod two days ago, the bike does not have the 'surge' sensation in the lower revs anymore.
riding around my block, which is a 40km zone, I can keep it below 3000rpm and everything is smoothed-out after the mods. before the mods it definitely didn't like being below 3500rpm.
I am still a n00b though

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post #14 of 52 Old 07-12-2012, 01:03 PM
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Quote:
Originally Posted by TheBeeDeeGee View Post
Mine def will buck if I'm creeping around at 2500 RPM, I think that's his problem. I learned quickly not to ride it in that rev range, no problems anymore.
I can now walk mine down below 1000 RPM.
I've kissed 800 RPM with a passenger on and on a slight uphill slope, no clutching, just right hand finesse with good mapping and proper cable slack.

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post #15 of 52 Old 07-12-2012, 01:44 PM
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So are you saying those of us with issues don't have enough right hand finesse and must practice more?


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post #16 of 52 Old 07-12-2012, 01:44 PM Thread Starter
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can you get aftermarket sensors? if so any links?

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post #17 of 52 Old 07-12-2012, 01:46 PM Thread Starter
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Fuel Pressure Regulator? and has anyone removed their baffles from the stock exhaust? just saw a post and was curious as to how it sounds and if they prefer it to stock

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post #18 of 52 Old 07-12-2012, 01:48 PM
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Quote:
Originally Posted by lmgtk4 View Post
Fuel Pressure Regulator? and has anyone removed their baffles from the stock exhaust? just saw a post and was curious as to how it sounds and if they prefer it to stock
You're talking about a bafflectomy.

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post #19 of 52 Old 07-12-2012, 02:18 PM
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Quote:
Originally Posted by lmgtk4 View Post
Fuel Pressure Regulator? and has anyone removed their baffles from the stock exhaust? just saw a post and was curious as to how it sounds and if they prefer it to stock
I just don't think anything is wrong with your bike. The fact that you say it happens when 'easy on the throttle' around 2500 rpm. If I'm just creeping around with the throttle barely cracked it is very easy to make the bike lurch and jerk if you don't slip the clutch.

Like Mcromo said, his doesn't do this, but he has a custom fuel map. That would probably fix it.


As far as the baffle-ectomy. I prefer it to stock, stock is just way to quiet for me. Does it sound as good as a nice aftermarket exhaust, I don't think so, but at least you have some sound. But I think it did make my stink worse, but I don't mind.

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post #20 of 52 Old 07-12-2012, 02:25 PM Thread Starter
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ok, what year is your bike i saw a post that said if would be different for an 02. any idea where i can get a custom mapping sensor?

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post #21 of 52 Old 07-12-2012, 02:40 PM
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Just curious. What type of riding do you plan to do where you will be spending any time at 2500?

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post #22 of 52 Old 07-12-2012, 02:48 PM
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I would check the cable slack on the throttle as well as FPR. You can set the slack to nil or very close to nil, which would help with the on/off throttle feel. I usually like to stay around 3200-3500RPM when cruising, your stator will charge your battery at those RPMS as well.

Just swapped the FPR just a couple of days ago (thread). It drastically lowered stink and also helped a sluggish feel around the range you're talking about as well. You could also try getting a three wolves/moon shirt, according to that thread it's a fix-all.

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post #23 of 52 Old 07-12-2012, 03:12 PM Thread Starter
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alright so i got off work jumped on the bike and it feels like it died. The bike is super sluggish. 1/4 turn throttle to keep it from dying out of first gear. the bike feels like it has absolutely no power. its got a full tank. it buck and got very jerk on the highway. dont know whats going on. any ideas? FPR? spark plugs?

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post #24 of 52 Old 07-12-2012, 03:17 PM
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Battery.

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post #25 of 52 Old 07-12-2012, 03:31 PM
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Battery or ground cable is loose.

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post #26 of 52 Old 07-12-2012, 03:45 PM
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kiss method on the 919 (Keep it simple stupid)


First check the battery cables.

Next check the major ground lead thats under the tank on the throttle side of the backbone on the frame.

Does the bike crank over as fast as it normally should? If so then your batt is fine... if not then replace.


If both those are good, then its likely you have the one and really only part failure known to the 919 which is the fuel pressure regulator.

You can check this a couple of ways.

1. With the bike cold, start it up, feel the outer cylinder headers vs the inner cylinder headers.... if the inner's are cold compared to the outers then you have a FPR problem.

2. Pull the spark plug on cylinder #2 (that would be the second cylinder from the clutch hand side of the bike) ... if its black, FPR problem.

3. Pull the vacuum line on the FPR, if there is fuel dripping or smell of fuel in the line the fpr has gone bad.


All things stated... it really does sound like the FPR... easiest way to check is number 1.

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post #27 of 52 Old 07-12-2012, 06:20 PM Thread Starter
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Yeah I started the bike cold and the exhaust 1&4 are hot but I can hold 2&3 .

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post #28 of 52 Old 07-12-2012, 06:23 PM
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FPR

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post #29 of 52 Old 07-12-2012, 07:46 PM
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Quote:
Originally Posted by rmb
FPR
Yup. FPR. Sheesh, whoever said it was the battery was an idiot... >-<

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post #30 of 52 Old 07-12-2012, 08:31 PM Thread Starter
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Alright pulled the plugs and 2&3 smell of gas and look wet while 1&4 are gray and dry. I assume its the FPR but im going to change the plugs for good measure. Does anyone know where I can find a FPR, gonna call a few places in the morning but if anyone has a link or personally has a FPR in good working condition PM me please or post the link. Thank you for all your help.

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post #31 of 52 Old 07-12-2012, 09:42 PM
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Quote:
Originally Posted by g00gl3it View Post
So are you saying those of us with issues don't have enough right hand finesse and must practice more?

Not at all, especially when considering what my finesse level is.
My point is that if properly mapped, synched, and cable slacked, anyone can have a rheostat type response from their 919.

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post #32 of 52 Old 07-13-2012, 11:00 AM
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Quote:
Originally Posted by mcromo44 View Post
Not at all, especially when considering what my finesse level is.
My point is that if properly mapped, synched, and cable slacked, anyone can have a rheostat type response from their 919.
Yeah, I was being completely sarcastic . I wholeheartedly agree with you.

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post #33 of 52 Old 07-16-2012, 01:53 PM Thread Starter
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Can you change the FPR without taking off the take or is that nessacary?

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post #34 of 52 Old 07-16-2012, 02:54 PM
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I brlieve you'll have to lift the tank, I don't think you have to remove the tank. Search for FPR replacement here, I think there's a thread and maybe even a video.

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post #35 of 52 Old 07-16-2012, 04:42 PM
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ronayers usually has real good prices on OEM parts.

and yup... its the FPR no doubt bout it. its a pretty simple replacement, all you need to do is lift the tank.

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post #36 of 52 Old 07-16-2012, 08:19 PM
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Not for nothing but (k.i.s.s) keep it simple stupid when was it last maintenanced air filter, spark plugs oil change? Not saying oil will affect fuel injection but the air filter def will give you sputter and rich gas smell so will spark plugs

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post #37 of 52 Old 07-16-2012, 08:25 PM
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Not for nothing but when was the bike last maintenanced I mean (k.i.s.s.) keep it simple stupid air filter, spark plugs, oil change. I am not saying that an oil change is going to fix the issue but a clogged air filter will definitely give you the heavy gas smell and the sputtering issue, so will bad plugs id start their before diving into fuel regulators and remapping my 2004 has a little sputter but its not obnoxious and my backpack and clothes smell like exhaust not like fuel but other then that I have noticed a buck at the low low but that's to be expected everything I have ever ridden has that

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post #38 of 52 Old 07-16-2012, 08:27 PM
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Quote:
Originally Posted by nd4spdbh View Post
kiss method on the 919 (Keep it simple stupid)


....... the fuel pressure regulator.

You can check this a couple of ways.

1. With the bike cold, start it up, feel the outer cylinder headers vs the inner cylinder headers.... if the inner's are cold compared to the outers then you have a FPR problem.

2. Pull the spark plug ...........

All things stated... it really does sound like the FPR... easiest way to check is number 1.

I dont really get this part... can anyone explains to me what is the theory for number 1?

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post #39 of 52 Old 07-16-2012, 08:34 PM
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Quote:
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I dont really get this part... can anyone explains to me what is the theory for number 1?
It has to do with how the FPR works. If the FPR is not working correctly, it'll flood the #2 and 3 cyls. which results in cyl #1 and 4 firing, but 2 and 3 remaining cold, a telltale sign.

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post #40 of 52 Old 07-16-2012, 10:11 PM
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yup like pvster stated and i will elaborate.

The FPR is vacuum operated off the inner 2 and 3 cylinders (along with the intake flapper). What happens is the diaphragm in the FPR gets a little hole in it over time (which i think has to do with alot of sitting and non use)... this hole allows gas to be sucked into the 2 and 3 cylinders flooding them, not allowing them to fire and thus cold 2 and 3 headers.

like stated its a telltale sign... and honestly one of the only "problems" the 919 has.... its a 50ish dollar part that can be replaced in 30 min or so.

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