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Discussion Starter #1
hello again. helppppppWe are currently working on a 1995 VN750
trying to get to carbs so we can work on choke. HOW do we get the airbox out of the way. bike runs then surges then dies.. anyone have a virtual pistol to shoot it and put it and us out of misery
 

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Calif Rider
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725 Posts
I may be wrong but as far as I have read about the air box.. I have not done this myself, but the engine has to removed, or you cut it out of the bike frame. It goes in first before the engine is installed. As for getting the carbs out to work on them it can be done gut a big pain. Look up carbs removel in the search area top right of page.
 

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Sparky!!!
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8,697 Posts
weh44att is right... the only way to get that darned air box out is to drop the engine or cut it out. removing the carbs is a pita with the airbox in place.. which is the number one reason people go with an ear shave.
 

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Old Truck Junkie
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4,133 Posts
hello again. helppppppWe are currently working on a 1995 VN750
trying to get to carbs so we can work on choke. HOW do we get the airbox out of the way. bike runs then surges then dies.. anyone have a virtual pistol to shoot it and put it and us out of misery
Do you want to see the bike go?? Or do want to go first?? lol

Are you planning on going back with the air box?? If so don't remove it. It can be removed whole with the engine in place, but it is not easy. You will have to remove some water lines and work out backwards.
 

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Banned
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1,620 Posts
The surge tank can be removed without dropping the engine......but you do have to remove water lines and some electrical connectors, and even then it's a PITA. But you don't have to remove the surge tank to get the carbs out, at least not on my bike (before the ear shave) I cut my surge tank out with a saw when I did the ear shave
 

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Registered
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Discussion Starter #6
does the ear shave get rid of the need for the airbox>>
also we tried marbling today and the bike ran terribly hellllooooo
 

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Banned
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Yes, the ear shave will get rid of the 'airbox'
I completely removed all the emissions off of my bike, it had the 'California' emissions on it too..... runs great without any of that crap on it.
 

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Premium Member
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3,027 Posts
I have a CA model, and removed ALL parts of both the air injection system and the evap system. That's a LOT of parts, about 20 pounds worth. But the bike runs great. You may have an air leak somewhere.

The airbox. You have 2 choices. You can cut up the airbox and remove it, then get a complete "earshave" kit, which includes all the parts to do the job right, including new carb jets.

Or if you want to keep the airbox, and the stock filter housings, you can get the carbs out by removing the gas tank, removing the rubber ducts that connect the carbs to the airbox (surge tank), then wrapping something around underneath the airbox and over the frame backbone tube to hold the airbox up out of the way, so you can get to the carbs. It's still a bit tight, but much easier. Loosen the clamps that hold the carbs to the manifolds, spray WD40 around the connections, and work them loose. Both carbs come out together. They are actually one piece. Leave all the cables on them until you get the carbs out, and make sure you put them back on before reinstalling the carbs. It is (almost) impossible to put the cables back on with the carbs in place.

But either way, all the crappy emissions garbage needs to go. My bike runs much better, and even a bit cooler, since I removed all that crap. If you remove the emissions crap and keep the airbox, you will need to plug 2 holes in the airbox, and a vacuum fitting on the rear carb. If you have 2 connections at the rear of the tank, just put longer hoses on them, and run them out underneath the bike somewhere, so the tank will be vented to the atmosphere as it should be. Jerry.
 

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Super Moderator
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11,934 Posts
I just read about the "Ear Shave" Procedure, does it really produce better performance??
Yes.

(if done properly) your getting more air and fuel into the cylnder...more fuel, bigger bang, more power. We are not talking arm stretching power, perhaps another 2-3 hp overall.
 

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1986 VN750
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3,255 Posts
I just read about the "Ear Shave" Procedure, does it really produce better performance??
I'm not a fan of the ear-shave myself, but I do highly suggest removing all the California emissions stuff. It made a world of difference on my ride.
 

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I just did the earshave on my bike and love it. Looks better sounds better and has more umph. !!! Wouldn't go back.
 

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Premium Member
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3,027 Posts
I don't recommend doing the earshave simply because you have to use inferior air filters that do not filter nearly as good as stock, which will increase engine wear and shorten the life of your engine. I actually like the ears, they give the bike some character. I agree the convoluted intake system is overly complex, and I do not like complicated things. But protecting my engine comes first.

I have removed and reinstalled my carbs twice with the airbox in place, and did not have any problems other than it took a while. Get something to drink, sit down and take your good easy time, you'll be surprised how easy it is.

The main thing is to tie the airbox/surge tank tightly to the frame, so it can't keep falling down in your way. Remove the ducts between the airbox and carbs. Also remove any hoses connected to the bottom of the airbox.

I do strongly recommend complete removal of the CA emissions crap (if you have it) and the air injection system, which all Vulcan 750s have. Each one has a hose that goes to the airbox, which can be plugged with snap in rubber or plastic plugs. When you have the carbs out is a good time to plug the holes, since you have plenty of room to get to them. And with those hoses out of the way, carb removal/installation is a whole lot easier.

I can't think of any reason why a bike would run worse with marbles, assuming you used marbles bug enough to fit tightly in the hose. That mod doesn't really have anything to do with how the bike runs, it is to cool down the exhaust temperature and reduce backfiring on deceleration, but the main reason I removed the whole system was to get rid of a bucket load of ugly and unnecessary parts, and because it was required by the epa nazis. Not going to go there.
 
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