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Beer van Huet
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« on: August 05, 2012, 01:17:44 PM » |
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By now, I know at least 10 bikes where the pre-filter (small piece of foam) in the airfilter cover intake has deteriorated to the extent that the engine does not accelerate above 3500 RPM. This may be accompanied by black smoke from the pipes and increased fuel consumption. Most people noticed pieces of foam lying on top of the airfilter. I expect more bikes to follow soon. So, if you experience this problem, take a look at the airfilter cover as well. Any type of foam of the same size will fix the problem temporarily. The pre-filter cannot be ordered seperately, it is a permanent part of the cover.
Beer
VRCC Benelux Rep
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Chrisj CMA
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« Reply #1 on: August 05, 2012, 04:14:37 PM » |
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I think I recall learning that we dont have that particular item on US bikes
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Ricky-D
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« Reply #2 on: August 05, 2012, 04:17:20 PM » |
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If you are talking about the pre-filter that comes with the K&N filter,
Well I threw that away when I first installed the K&N and there never has been a problem running without that foam piece.
If that little piece of foam can affect the running of your Valkyrie, there's more to it than just that piece of foam.
***
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2000_Valkyrie_Interstate
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X Ring
Member
Posts: 3626
VRCC #27389, VRCCDS #204
The Landmass Between Mobile And New Orleans
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« Reply #3 on: August 05, 2012, 05:32:06 PM » |
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If you are talking about the pre-filter that comes with the K&N filter,
Well I threw that away when I first installed the K&N and there never has been a problem running without that foam piece.
If that little piece of foam can affect the running of your Valkyrie, there's more to it than just that piece of foam.
***
No, he wasn't. Marty |
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People are more passionately opposed to wearing fur than leather because it's safer to harass rich women than bikers.  |
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Mildew
Member
Posts: 464
Live, Not Just Exist
Auburn, Ga
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« Reply #4 on: August 05, 2012, 06:20:53 PM » |
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My 14 year old filter still looks new  |
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Live, Not Just Exist
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BonS
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« Reply #5 on: August 05, 2012, 07:47:36 PM » |
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Some overseas Valkyries are tuned for less horsepower. The jetting is different and the airbox is different and has an additional foam prefilter. This prefilter has to be in place or the engine runs horribly. AFAIK.
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X Ring
Member
Posts: 3626
VRCC #27389, VRCCDS #204
The Landmass Between Mobile And New Orleans
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« Reply #6 on: August 05, 2012, 09:48:35 PM » |
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If you are talking about the pre-filter that comes with the K&N filter,
Well I threw that away when I first installed the K&N and there never has been a problem running without that foam piece.
If that little piece of foam can affect the running of your Valkyrie, there's more to it than just that piece of foam.
***
No, he wasn't. Marty If it is not the KN pre filter then what is it? Read the OP. Beer says it is a permanent part of the cover. It may be something the Europeans require for noise abatement or to restrict airflow for less hp. Marty |
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People are more passionately opposed to wearing fur than leather because it's safer to harass rich women than bikers. |
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Chrisj CMA
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« Reply #7 on: August 06, 2012, 03:58:17 AM » |
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If you are talking about the pre-filter that comes with the K&N filter,
Well I threw that away when I first installed the K&N and there never has been a problem running without that foam piece.
If that little piece of foam can affect the running of your Valkyrie, there's more to it than just that piece of foam.
***
Using or not using that foam will not have huge consequences, but...it will change the the mixture.....will run a tad leaner without it. Mine was running real rich with the Honda air filter........changed to the K&N without the prefilter and it leaned it out, but a bit too much. Just right with that pre filter added in...... |
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Blackduck
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« Reply #9 on: August 06, 2012, 05:05:30 AM » |
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It is foam but it is not a filter as such. It is for noise reduction, does not filter any air.
On my current Valk (2001) I had to go from 78 mains to 100's when I removed it.
The Valkyrie air box acts like a choke and the faster you go the richer the mixture becomes, modifying any of it to increase airflow leans off the mixture, even just removing that 4" x 4" x 3/8" foam pad.
If the US bikes don't have the pad it would explain why your bikes have 100 mains. All part of Honda's anti pollution (noise) controls.
Along with 78 mains our piggies are only 1/2" pipe not the US 3/4"
Cheers Steve
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2001 Standard, 78 Goldwing, VRCC 21411
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BonS
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« Reply #10 on: August 06, 2012, 08:05:09 AM » |
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It is foam but it is not a filter as such. It is for noise reduction, does not filter any air.
On my current Valk (2001) I had to go from 78 mains to 100's when I removed it.
The Valkyrie air box acts like a choke and the faster you go the richer the mixture becomes, modifying any of it to increase airflow leans off the mixture, even just removing that 4" x 4" x 3/8" foam pad.
If the US bikes don't have the pad it would explain why your bikes have 100 mains. All part of Honda's anti pollution (noise) controls.
Along with 78 mains our piggies are only 1/2" pipe not the US 3/4"
Cheers Steve
I agree that the pad doesn't filter air. And whereas I can see where the foam pad and shrunken exhaust outlet size may contribute somewhat to intake and exhaust noise reduction I absolutely cannot see where shrinking the jets, stifling the exhaust outlets by 55% and stuffing a restrictor in the air intake path couldn't reduce horsepower and/or torque. I wonder if the ignition module part number is different as well? |
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Blackduck
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« Reply #11 on: August 06, 2012, 07:20:59 PM » |
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BonS,
Checked my module, does not have the Honda part number as such, MZOAE 681A 08 14U
Standards use MZO and I/S MBY prefixes
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2001 Standard, 78 Goldwing, VRCC 21411
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BonS
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« Reply #12 on: August 06, 2012, 08:20:15 PM » |
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The part number for the original US ignition module for 1997 & 1998 Standard was 30410-MZ0-760 but is replaceable by 30410-MZ0-671 if necessary. Starting in 1999 the Standard module is 30410-MZ0-671.
The US Interstate model is 30410-MBY-003 and never changed.
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« Last Edit: August 07, 2012, 04:56:05 AM by BonS »
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