I've been having this issue with a strange bleep sound coming from the front end of my motorcycle. (Recording attached)
Through various tests, trials, and pain, here is a summary of what I've managed to find todate:
This sound only seems to occurs when the engine temperature is over 70°C. (Exact temp, I'm not sure - it might be 75°, or 77°, but somewhere in the vicinity of this).
The sound appears to be throttle related. It's probably hard to hear in the audio, but I am ever so slightly 'bleeping' the throttle (with the lightest of touch) to get this sound to occur. (Please - no jokes about bleeping causing a bleep :) ) Without touching the throttle there is no bleeping sound at all.
This sound has occurred both when the bike is in gear, and also in neutral. (Originally from a previous discussion at http://www.vfrdiscus...onk-from-front/it was looking like it might be the flapper valve but recently I've confirmed that it does happen in neutral as well).
This sound has occurred when the bike has both being stationary, as well as moving. (I've only noticed at low speeds / revs but that may be because I can't hear it over engine and wind noise at faster speed / revs)
It doesn't appear to be the horn from what I have checked.
It seems as though it occurs in gear more than in neutral. This may just be my mind playing tricks with me - but it's definitely occurred in neutral as well.
I've already had one mechanic try and find the issue without luck (although at that stage I didn't have as much information compiled as I have now), and will be looking at taking it to another mechanic for a look, but if anyone has any ideas as to what this might be I would be extremely grateful.
Cheers
Adam.
Attached Files
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[image: Attached File]
bleep.mp3 275.06KB
50 downloads
Sounds just like the flapper valve to me. Lift the tank, pull and plug the vacuum hose and try it again. My bet is that the sound will be gone.
Thanks Lint. I'll pull off the fuel tank and will try pulling that hose off to see what happens.
Any news on this? It's been a minute.
Timing. :) I've been away for a couple of weeks, and haven't had a chance to get the bike out for a ride until today.
Unfortunately the sound wasn't as loud today as normal for me to check out (typical), but I still believe I could hear it faintly. I lifted the fuel tank, removed the hose, and unfortunately I believe I could still hear the sound as before, so it's looking like it may not be the flapper. :-( I would have liked it to have been louder and more pronounce as it has been the last few times after a ride, so if/when it's louder again I'll do the check just to make sure this time it wasn't my tinnitus...
I do have the bike booked in for a service soon though with another mechanic, so I'll run the recording by them too.
This should be dealt with in the original thread... now we have two threads on the same issue from the same author... this will not help my multiple personailty disorder.
:unsure:
So... did you run the procedure I posted in the other thread for testing the flapper valve?
If you didn't you can't discard or confirm whether it is or isn't the flapper valve.
Do me a favour: put the bike on the centrestand, be REAL SURE that the rear wheel is OFF THE GROUND. Make sure no dogs or cats or small children are lurking around (mother's in law are OK), just in case they get there head or arm or leg taken off in the spokes of the spinning wheel... now do your same "bleeping" of the throttle with the bike IN GEAR and the bike IN NEUTRAL... again CAREFUL with the bike in gear (try weighting down the front) you don't want the spinning real wheel to touch the ground and launch the bike forward!!!
Now: does it make the noise both in gear and in neutral??
I started this new thread because the original had lots of different directions, such as steering bearings, suspension, etc. After narrowing down the sound to be directly linked to the throttle I thought it was better to clean up. Sorry if I've done the wrong thing.
I have previously done what you've mentioned. Yes - the sound occurs both Neutral as well as in gear.
Someone else has a thread where I can hear the same sound in it:
http://www.vfrdiscus...attach_id=39737
They have a video looking at part of the engine: http://www.vfrdiscus...attach_id=39737
I'm not sure if they're referring to the different tones in the engine either side of the bleep, or the bleep itself, but the bleep sound is very close, if not exactly what I'm hearing.
That's the flapper, bro. Go in, remove all things flapper, then it will be gone.
The air box is very noisy on the 6th gen, but I am 100% sure that is the flapper "gulping".
Once I removed the valve, lines, yada yada the sound went away for me.
Veefer2010 has the same issue as me, and has just found a recent discovery that it may be related to the PAIR Valve solenoid
http://www.vfrdiscus...it-2010-vfr800/
I'm yet to disable PAIR on my bike. I took off the flapper valve hose, but the problem seemed to remain, so I'm going to check out this PAIR stuff instead...