Any Problems with Ear Shaves? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 17 (permalink) Old 01-18-2012, 09:11 PM Thread Starter
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Any Problems with Ear Shaves?

I am really wanting to do the "Ear Shave" on my '92 this spring. I just got a set of Cobra Pipes and I want to do the shave when I install them.

I have read a lot about it and and tracked down all the parts that I will need. Seems like it can be a pain in the a#$ because of the airbox and carbs being cramped in the frame. But, that just gives me an excuse to spend a whole day in the garage.

Has anyone experienced any problems after doing this? (Ex. sluggish throttle, bogging, poor idle, etc...)

The reason that I ask is because I had a problem with my engine randomly sputtering due to an improperly placed vacuum line.
Here is the thread from that issue.
https://www.vn750.com/forum/showthread.php?t=17570

I had to re-route the vacuum line into the back of the right side Ear to keep wind from blowing in and causing the carbs to cut out on me.

If I remove the ears and airbox/hoses, will I encounter any problems like this? Or any other problems for that matter? I'd really hate to modify the stock intake on my bike just to end up causing some kind of problem that takes me forever to diagnose.

Thanks for any info!!
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post #2 of 17 (permalink) Old 01-18-2012, 09:53 PM
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The only issue in altering the air intake is adjusting the jetting properly to get the proper fuel/air mixture.

Luckily, there have been enough here that have done this to help you out that it makes it alot easier.

If it's something you really want to do, I'd say go for it. There's many here happy with theirs, and can help you out if you run into any problems.

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post #3 of 17 (permalink) Old 01-19-2012, 05:11 PM
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It's a fairly straightforward procedure, the only downside to it is you have to use inferior (and by that I mean they don't filter as well, not talking about performance here) filters, which will allow more dirt into your engine. That part has been proven in tests. I'm just going by the "common sense" method in coming to the conclusion that more dirt in the engine means accelerated engine wear and reduced engine longevity.

It does simplify things, and I love simplicity. I have removed the complete CA evap system, the complete air injection system, the clutch and sidestand safety switches, the rear throttle cable, the license plate bracket and light, and even the right front brake (which besides simplifying things, actually improved braking feel and performance for me). In other words, I removed most of the things that either served no purpose and looked bad to me, and/or were actually detrimental to the performance of the bike. But I kept the complete stock intake system, mainly because of the filters, but also because I actually like the ears. I am mainly a long distance highway rider, and rack up a lot of miles (71,000 on my '02 so far), and I want my engine to last as long as possible.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #4 of 17 (permalink) Old 01-19-2012, 05:43 PM Thread Starter
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Thanks for the responses.

I just wanted to make sure that I wasn't going to run into problems with vacuum lines or something that would cause the bike to run poorly.

I figure that I'll probably need to re-jet for the Cobra Pipes anyway. (Even though it says you don't have to) My bike always seemed like it was slightly lean in stock form. So....I figured that it would be a perfect time to do the ear shave.

I love the look of the bike without the ears. Plus, I hate how the reeds cause so much popping and backfiring. That airbox just seems ridiculous to me anyway.

I know that Kawasaki designed that system to work well on the VN750. But, I do think that the modified intake (along with re-jetting) should help the bike run a little better throughout most of the RPM range.

Hopefully all goes well and I'm cruisin' with a little less ear and a little more throat this spring.
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post #5 of 17 (permalink) Old 01-19-2012, 07:55 PM
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The reed valve setup can and should be removed. It's just gvt. garbage. I removed mine years ago. It causes the exhaust to run hotter by injecting air into the exhaust, to burn any remaining fuel that might have escaped being burned in the combustion chamber, and winds up in the exhaust. This is a bad idea. Not only does it cause the exhaust to run hotter, but burning the fuel in the exhaust also causes backfiring, especially on deceleration.

I agree that the air intake system is too complicated (just like the rest of the bike), but I don't know of any filters you can get that attach directly to the carb that filter anywhere near as well as the stock filters. Those filters are about the same as stretching pantyhose over a wire mesh frame. I used to use those filters back when I was into performance moped tuning. But in every single case, the engine always blew up from being overstressed before the dirt had a chance to do much damage. Anyway IF filters that matched the stock filters filtering ability were available, I'd probably do the earshave thing too, just to rid the bike of more complication. But I would keep the ears, because I like the way they look. I only wish you could get solid chrome covers for them, like the old BUBF 1500.

Oh yeah, there is one hose you will have to deal with, and that is the crankcase vent hose, connected to the front head. It is normally connected to the stock airbox, but if you remove the airbox, you will need to put some kind of filter on it.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #6 of 17 (permalink) Old 01-22-2012, 01:50 AM
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Did mine per a write up on the forums, runs better, starts better and just all around feels better, I know all the people want to pro and con it to death but it was best move I made to the bike for me, cutting out that POS air box makes working on it ALOT easier as well.

Bike 1: (Wifes Bike Now)
2005 VN750
Ear Shave / Coastered (142/42)
Fire & Steel Saddle Bag Supports
Fire & Steel Signal Relocators
Fire & Steel Luggage Rack
Fire & Steel Engine Guard
V&H Pipes
AGM
RR Relocated
Sissy Bar Extender
170 Rear Tire

Bike 2:
2008 Harley Davidson FLHX Street Glide
1584cc (96 CID)
AM/FM/WX/CD/MP3

https://www.vn750.com/forum/signaturepics/sigpic10325_1.gif

www.escambiariders.com
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post #7 of 17 (permalink) Old 01-23-2012, 08:50 AM
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If you're thinking about the ear shave, think about this version abyssdncr did.
I've personally done this as well & I love it. I opted for the slightly shorter in height filter & I didn't have to modify the cooling pipes at all.

I'm very please with the K&N's performance.

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EDIT: Correction, Looks like I had the originator wrong. abyssdncr used the same filter I did but AceMcGyver first did this in 09.

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Last edited by kanuck69; 01-23-2012 at 09:02 AM.
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post #8 of 17 (permalink) Old 01-23-2012, 11:39 AM
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i did the same as above posts except i used a brigs and straton air filter
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post #9 of 17 (permalink) Old 01-23-2012, 12:58 PM
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Check this or click link below.
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post #10 of 17 (permalink) Old 01-23-2012, 01:12 PM
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I like the setup that AceMcgyver did, except that it still uses a K&N filter. I wonder if there is a real filter available that would fit like that? I would think a Briggs&Straton filter would work ok. I have both used and worked on a lot of lawn equipment with B&S engines, plus had a mini bike with one about 45 years ago. A lawnmower is used under about the same conditions as a dirt bike, and I have cleaned and reoiled hundreds, probably thousands of B&S filters. They would be completely caked with dirt on the outside, and totally clean on the inside. The secret is to use a LOT of oil on them, and clean and reoil them after every so many hours of service.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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