KNOCKING NOISE WHEN ACCELERATING - Wrist Twisters
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post #1 of 44 Old 06-25-2009, 06:50 PM Thread Starter
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KNOCKING NOISE WHEN ACCELERATING

I searched "knock" & "knocking" and still don't have a clear answer.

Some say injectors................

Some say loose spark plug..........

Some say cam chain tensioner.........

Some say don't worry, just ride...........

I say it is ANNOYING and it needs to go away.


So what is the cause?

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post #2 of 44 Old 06-25-2009, 07:47 PM
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the best and only cure I know of is.... "Loud Exhaust". Problem noise gone!!!

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post #3 of 44 Old 06-25-2009, 07:48 PM
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Woohooo! I beat Brian for the first reply!

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post #4 of 44 Old 06-25-2009, 07:49 PM
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I heard once that turning up the volume on your IPOD makes the bad sound go away, too

Well, fire the engines! Spur this iron space-pony on!

"The Shadow"
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post #5 of 44 Old 06-25-2009, 07:53 PM
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Any way for you to isolate the sound motor vs. running gear i.e. only happens when revving the motor or only happens under load etc.?

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post #6 of 44 Old 06-25-2009, 07:54 PM
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Damn you guys! B. told me he was heading out for the evening-I thought I'd steal a first responder!

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post #7 of 44 Old 06-25-2009, 08:27 PM
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Quote:
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Woohooo! I beat Brian for the first reply!
i wasnt home... it don't count.....

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Damn you guys! B. told me he was heading out for the evening-I thought I'd steal a first responder!
haha... had a good time ... won a few bucks off the suckers...



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post #8 of 44 Old 06-25-2009, 09:39 PM
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Pauli

Have you had either of your wheels off lately?

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post #9 of 44 Old 06-26-2009, 09:18 AM Thread Starter
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Quote:
Originally Posted by Nesty View Post
Any way for you to isolate the sound motor vs. running gear i.e. only happens when revving the motor or only happens under load etc.?
Only under load. Cruising at 3500 RPM no knock, rolling on the throttle or up a hill the knock it there.

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post #10 of 44 Old 06-26-2009, 09:20 AM Thread Starter
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Pauli

Have you had either of your wheels off lately?
No

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post #11 of 44 Old 06-26-2009, 09:41 AM
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Quote:
Originally Posted by PAULIBIKER View Post
I searched "knock" & "knocking" and still don't have a clear answer.

Some say injectors................

Some say loose spark plug..........

Some say cam chain tensioner.........

Some say don't worry, just ride...........

I say it is ANNOYING and it needs to go away.


So what is the cause?
Assess the root cause and stop it that way. Just stop accelerating!

Seriously, I'd empty or run the tank down and go to a different gas station. If you have a Sunoco 94, try a tank of that. IMO, the easiest thing to eliminate is the fuel. Be it octane or moisture. Then go after the other stuff.

It's better to have loved and lost than live with the psycho for life!
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post #12 of 44 Old 06-26-2009, 09:44 AM
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would you tighten the sparkplugs... or at least check them to see...

my #3 plug was loose and me and tk919 agreed it sounded like it was knocking....

it only takes a few minutes... and none of us can fix your bike from our houses... you actually have to try the things we suggest...


or just take it to the dealership...



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post #13 of 44 Old 06-26-2009, 10:13 AM
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Quote:
Originally Posted by PAULIBIKER View Post
I searched "knock" & "knocking" and still don't have a clear answer.

Some say injectors................

Some say loose spark plug..........

Some say cam chain tensioner.........

Some say don't worry, just ride...........

I say it is ANNOYING and it needs to go away.


So what is the cause?


I have personally owned 2 919s, a 2006 and my current 2007. I know exactly the noise you are talking about, as both of my 919s did it, and it used to drive me crazy. As an MMI grad and tech, I personally beat this subject to death desperately trying to find the cause. In the end, it was verified via Honda themselves that this particular motor is prone to "piston slap"....makes perfect sense to me now They assured me it was ok and to just ride the piss out of it.

As mentioned before, try to drown the noise with pipes, earplugs, music etc. I notice that I still baby the bike due to the "knocking" if I get on it without earplugs. Otherwise, I run the mess out of it.

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post #14 of 44 Old 06-26-2009, 10:16 AM
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What is piston slap?

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post #15 of 44 Old 06-26-2009, 10:22 AM
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piston skirts hitting cylinder walls in short...

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post #16 of 44 Old 06-26-2009, 10:23 AM
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long answer : What is Piston Slap

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post #17 of 44 Old 06-26-2009, 10:33 AM
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Quote:
Originally Posted by PAULIBIKER View Post
I searched "knock" & "knocking" and still don't have a clear answer.

Some say injectors................

Some say loose spark plug..........

Some say cam chain tensioner.........

Some say don't worry, just ride...........

I say it is ANNOYING and it needs to go away.


So what is the cause?


Some characteristics of this "KNOCKING" noise?

- Is it worse when the bike is cold?
-Is it heard mostly between 3k and 5k RPM, and seem to totally go away above 6k RPM?
- Is it loudest or only heard under moderate acceleration?

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post #18 of 44 Old 06-26-2009, 12:51 PM Thread Starter
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Quote:
Originally Posted by redrider22 View Post
Some characteristics of this "KNOCKING" noise?

- Is it worse when the bike is cold?
-Is it heard mostly between 3k and 5k RPM, and seem to totally go away above 6k RPM?
- Is it loudest or only heard under moderate acceleration?
-Can not recall
-Yes
-Yes

Sounds like we're on the same page.

So what is it? Piston slap? I have a hard time believing a Honda would have piston slap.

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post #19 of 44 Old 06-26-2009, 01:21 PM
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Yes, piston slap. Try not to look at it as a flaw, but a characteristic. I know for sure these things go and go with this "knocking" and it never changes. I have a buddy with a 2003 919 that he bought new and is currently clocking 50k+ miles and he has always had this without change. You can search for other threads here that discuss this same thing. The top ends on these things, as well as all sport bikes but especially hondas, are put together with very loose tolerances. It is even within spec for a Honda to burn a half quart to 3/4 quart of oil every 1000 miles without a problem. BTW, what oil you using and how many miles you got on the bike?

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post #20 of 44 Old 06-26-2009, 01:39 PM Thread Starter
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Quote:
Originally Posted by redrider22 View Post
Yes, piston slap. Try not to look at it as a flaw, but a characteristic. I know for sure these things go and go with this "knocking" and it never changes. I have a buddy with a 2003 919 that he bought new and is currently clocking 50k+ miles and he has always had this without change. You can search for other threads here that discuss this same thing. The top ends on these things, as well as all sport bikes but especially hondas, are put together with very loose tolerances. It is even within spec for a Honda to burn a half quart to 3/4 quart of oil every 1000 miles without a problem. BTW, what oil you using and how many miles you got on the bike?
2000 miles. Rotella 5w40 syn.

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post #21 of 44 Old 06-26-2009, 01:40 PM
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it's nearly brand new! did you put in the rotella at your 600mile service?

30,000 mile 919 survivor. No plans of stopping the abuse any time soon.
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post #22 of 44 Old 06-26-2009, 01:49 PM
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is it still in warranty????

if so take it to the dealership



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post #23 of 44 Old 06-26-2009, 01:51 PM
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Mine doesn't slap. I get a slight tick at idle when it is really hot, but that's the only sound I hear besides vroom, vroom.

Press Any Key To Continue.
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post #24 of 44 Old 06-26-2009, 01:59 PM
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Quote:
Originally Posted by redrider22 View Post
Yes, piston slap. Try not to look at it as a flaw, but a characteristic. I know for sure these things go and go with this "knocking" and it never changes. The top ends on these things, as well as all sport bikes but especially hondas, are put together with very loose tolerances. It is even within spec for a Honda to burn a half quart to 3/4 quart of oil every 1000 miles without a problem.
I call on all points mentioned!

Unless you have litigate data please do not post hearsay and innuendos which some of our less technical members will take as the gospel.

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post #25 of 44 Old 06-26-2009, 02:09 PM
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Quote:
Originally Posted by MisterMike View Post
I call on all points mentioned!
absolutely correct...


pauli have you even tried any of the suggestions we gave you???



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post #26 of 44 Old 06-26-2009, 02:21 PM Thread Starter
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Quote:
Originally Posted by barton664 View Post
absolutely correct...


pauli have you even tried any of the suggestions we gave you???

I tightened the plugs, except #3. The Honda dealer had to order the spark plug wrench.

Knowing my luck that will be the one that is loose.


Besides the plugs, what else should I try?


To answer the earlier post, I just changed the oil and went with Rotella syn. BTW it "knock" before and after the oil change.

It is not in warranty.

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post #27 of 44 Old 06-26-2009, 02:24 PM
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Quote:
Originally Posted by PAULIBIKER View Post
I searched "knock" & "knocking" and still don't have a clear answer.

Some say injectors................

Some say loose spark plug..........

Some say cam chain tensioner.........

Some say don't worry, just ride...........

I say it is ANNOYING and it needs to go away.


So what is the cause?
all of the above...



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post #28 of 44 Old 06-26-2009, 05:18 PM
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Quote:
Originally Posted by PAULIBIKER View Post
Only under load. Cruising at 3500 RPM no knock, rolling on the throttle or up a hill the knock it there.
Quote:
Originally Posted by MisterMike View Post
I call on all points mentioned!

Unless you have litigate data please do not post hearsay and innuendos which some of our less technical members will take as the gospel.
I was trying to get a little more systematic course of troubleshooting going. Maybe somebody can chime in. If it is the plugs or anything else associated with the motor, wouldn't you hear the sound if you just revved the bike while on its stand? Whereas if you revved the bike and heard nothing, but then heard it while on the road and under throttle, wouldn't that lead you to the running gear?

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post #29 of 44 Old 06-26-2009, 05:28 PM
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Quote:
Originally Posted by Nesty View Post
I was trying to get a little more systematic course of troubleshooting going. Maybe somebody can chime in. If it is the plugs or anything else associated with the motor, wouldn't you hear the sound if you just revved the bike while on its stand? Whereas if you revved the bike and heard nothing, but then heard it while on the road and under throttle, wouldn't that lead you to the running gear?
if you wanna be all "analytical" and stuff yeah...



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post #30 of 44 Old 06-26-2009, 06:51 PM
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I recently purchased a new 2007 919 and it makes the exact same noises you describe. It goes in for a 600 mile checkup on Tuesday. I can post the results from my experience Tuesday evening.

My gut feeling is that if so many people are hearing the same thing, it probably is a trait of this motor. I'll have the Honda dealer's answer in a few days.

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post #31 of 44 Old 06-26-2009, 06:57 PM
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Could it be?

Lugging the engine - 1. Letting the RPMs fall a lot lower the engine's powerband (so it has very little acceleration). 2. Operating the engine at lower than normal RPM. 3. Being in a gear too high for your speed. The engine “lugs”, rattles or bogs suggesting you to downshift to a gear better suited to your current road speed.

Mine makes the knocking you describe if I accelerate at a low RPM in a higher gear like below 3000.

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post #32 of 44 Old 06-26-2009, 08:59 PM
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Mine doesn't knock or use a drop of oil. Guess I'm special.

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post #33 of 44 Old 06-27-2009, 03:52 AM
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Mine doesn't knock or use a drop of oil. Guess I'm special.
I'm with SBeau, that why MisterMike's post stands out to me.

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post #34 of 44 Old 06-27-2009, 05:10 AM
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Mine doesn't knock or use a drop of oil. Guess I'm special.
+1 I'm special........................-ed

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post #35 of 44 Old 06-27-2009, 06:39 AM
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+1 I'm special........................-ed
Well jeez, we knew that!

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post #36 of 44 Old 06-27-2009, 06:58 AM
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Mine has the "knock" as well under light load acceleration but then again I'm wearing a new helmet which seems to allow a little more outside noise in than my last lid. I'm now wondering if the sound was always there or just appeared.....I'm hoping for the latter.

Also agreed when "getting on it" I hear nothing but pipes....I'll dig into the bike further this weekend short of pulling the heads and I'll post up any findings that I may come across.




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post #37 of 44 Old 06-27-2009, 07:09 AM Thread Starter
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Quote:
Originally Posted by tpschil View Post
I recently purchased a new 2007 919 and it makes the exact same noises you describe. It goes in for a 600 mile checkup on Tuesday. I can post the results from my experience Tuesday evening.

My gut feeling is that if so many people are hearing the same thing, it probably is a trait of this motor. I'll have the Honda dealer's answer in a few days.
Thanks! Keep us posted.

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post #38 of 44 Old 06-27-2009, 02:55 PM
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I wonder if the knocking you hear is actually a rapping noise that mine makes thru the exhaust. At around 3-5k rpm full throttle, mine raps almost like a Duc. I don't know why it does this, but, I sorta like the sound. After 5k it starts to wail.
I can't hear my injectors, don't smell the exhaust, don't have piston slap, solid brake levers, don't use oil between changes.
I guess it was made on a wednesday about 10am.

[
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post #39 of 44 Old 06-30-2009, 04:19 PM
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Picked up my 919 from the dealer tonight after it's slightly overdue 600 mile checkup. In addition to the regular oil change and adjustments, I had them take it for a ride to listen to the sounds I was hearing under acceleration. The mechanic says the sounds I am hearing are the fuel injectors. I am hearing them open and close. The sound is perfectly normal for this engine. Nothing to worry about, just keep riding. This is the same response I read from a few of you other 919 owners under a different thread. My plan is to continue wearing ear plugs and ignore the sound. The bike now has almost 800 miles and it's time to start pushing the engine a little harder. I really enjoy the acceleration rush of pushing my 599 Hornet. I am expecting even more fun on the 919.

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post #40 of 44 Old 06-30-2009, 07:40 PM
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I'd say your fine.

I bet if rider A thinks his bike knocks & rider B doesn't the knock would follow the rider if they switched bikes. Same for the stink.

Mine stinks & knocks BTW.

But I can run 112 links

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