Knocking from the Clock

Bard · 08-31-2008, 01:06 AM

Hi everybody, I ride VFR 800 5th Gen, red one and I am charmed!

I have the following ask: When I press the clutch handle and start to release it a strange knock is heard from the clock. Or when I hold the handle in middle position this knock is getting frequent. Sounds like a relay .. but I found nothing in the manual. Ideas?

Vee-Ef-Ar · 08-31-2008, 03:49 PM

Hi Bard... playing with the clutch will cause the variable air valve {or flapper valve} to open and close on top of the airbox. Sounds a bit like a ping pong ball inside the airbox.

I sometimes hear mine when slowly releasing the clutch before a green light... pop pop, rumble rumble.

Search for flapper valve for more info.

Oh and welcome to VFRWorld.

Bard · 09-01-2008, 12:24 AM

Quote:

Originally Posted by Vee-Ef-Ar

on top of the airbox.

I hear it from the clock, not under the tank. And it happens only in gear.

I'll check this valve in the manual.

stephanon2whls · 09-01-2008, 10:14 AM

Quote:

Originally Posted by Bard

I hear it from the clock, not under the tank. And it happens only in gear.

I'll check this valve in the manual.

It's definitely the airbox intake flapper valve then.. You just provided the last piece of evidence I needed to be 100% sure.

You see, the flapper is only active while the bike if in gear. It is not actuated in neutral.

The noise sounds like it is coming from the clock because the actuator is under the tank towards the front. The noise is projected forward and reflects off of the instruments.

-Stephan

Bard · 09-01-2008, 12:11 PM

Quote:

Originally Posted by stephanon2whls

It's definitely the airbox intake flapper valve then.. You just provided the last piece of evidence I needed to be 100% sure.

You see, the flapper is only active while the bike if in gear. It is not actuated in neutral.

The noise sounds like it is coming from the clock because the actuator is under the tank towards the front. The noise is projected forward and reflects off of the instruments.

-Stephan

Ok, Thank you very much.

In the manual is written that this valve is open above 5500 rpm, and under 5000 is closed. What is my situation? Something to worry about?

Bard · 09-09-2008, 01:45 PM

You were right. It is airbox intake flapper. I left the tank and turn on the engine and saw the flapper.

Do I have to worry ?

stephanon2whls · 09-09-2008, 06:15 PM

Nothing to worry about.. all systems operating within parameters.

ChatBox (No new messages since your last visit)
Loading...
Message...
Ask your questions in the forums. The ChatBox is for small talk. Lamps to everyone!

08-31-2008, 01:06 AM	#1 (permalink)
Bard Junior Member Join Date: Jun 2008 Last Online: 09-09-2008 11:17 PM Location: Bulgaria My Ride: VFR 800 Fi 1999 Posts: 4 Thanks: 2 Thanked 0 Times in 0 Posts	Knocking from the Clock Hi everybody, I ride VFR 800 5th Gen, red one and I am charmed! I have the following ask: When I press the clutch handle and start to release it a strange knock is heard from the clock. Or when I hold the handle in middle position this knock is getting frequent. Sounds like a relay .. but I found nothing in the manual. Ideas?

08-31-2008, 03:49 PM	#2 (permalink)
Vee-Ef-Ar Member Join Date: Jul 2006 Last Online: 11-18-2008 12:36 AM Location: Queensland My Ride: 1998 Honda VFR800FI {Silver} View my Photo Gallery Posts: 57 Thanks: 0 Thanked 2 Times in 2 Posts	Hi Bard... playing with the clutch will cause the variable air valve {or flapper valve} to open and close on top of the airbox. Sounds a bit like a ping pong ball inside the airbox. I sometimes hear mine when slowly releasing the clutch before a green light... pop pop, rumble rumble. Search for flapper valve for more info. Oh and welcome to VFRWorld. __________________ Silver Stock Bob

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Re: electrical problem - nothing works but the clock,/ Main Fuse Starter Relay.		VF/VFR Mailing List	1	08-18-2008 05:39 AM
Re: electrical problem - nothing works but the clock,/ Main Fuse Starter Relay Area....	mrydr	VF/VFR Mailing List	0	08-13-2008 08:36 AM
Re: electrical problem - nothing works but the clock, and thatain't doing so well	Thomas Davenport	VF/VFR Mailing List	0	08-12-2008 07:06 PM
electrical problem - nothing works but the clock	Lee R	VF/VFR Mailing List	0	08-12-2008 12:23 PM
Knocking sound, please help	kinome79	Mechanics Garage	14	07-24-2008 08:05 AM

09-09-2008, 01:45 PM	#6 (permalink)
Bard Junior Member Join Date: Jun 2008 Last Online: 09-09-2008 11:17 PM Location: Bulgaria My Ride: VFR 800 Fi 1999 Posts: 4 Thanks: 2 Thanked 0 Times in 0 Posts	You were right. It is airbox intake flapper. I left the tank and turn on the engine and saw the flapper. Do I have to worry ?

09-09-2008, 06:15 PM	#7 (permalink)
stephanon2whls Member Join Date: Feb 2004 Last Online: 11-15-2008 12:42 PM Location: The 1st State. - Find Me! My Ride: 2000 VFR800 View my Photo Gallery Posts: 81 Thanks: 0 Thanked 1 Time in 1 Post	Nothing to worry about.. all systems operating within parameters.