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Discussion Starter #1
I have a Vulcan Custom 900 SE and I need to know which one does a better job.
Any help would be apperciated. Thank you.
 

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Actually what you need to do first is marble. Lot's of threads on this forum on how to go about it. Only took me about 5 minutes and almost eliminated the popping. Still some but not much and marbling is free.
 

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BOTM Winner, December 2013
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actually you dont even need to marble.... first make sure the idle is set at a minimum of 950rpm, second make sure the throttle cables have the proper amount of slack in them and third when decellerating close throttle all the way... as having the throttle twisted even enough to take up the slack will make it pop...
 

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Discussion Starter #6
Actually what you need to do first is marble. Lot's of threads on this forum on how to go about it. Only took me about 5 minutes and almost eliminated the popping. Still some but not much and marbling is free.
Thank you all for the marble ideea. I will try that first but how do you do a search on the subject for the VN900? This is not easy to navigate.
Also, Electronic Jet kit sells the Gen 3 digital box with 6 settings for $250. Does any of you have any input on this compared with Dobeck 4 pot box for $170 on Amazon?
I am asking because I intend to get a K&N air filter or box with a larger filter in the future.
 

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Thank you all for the marble ideea. I will try that first but how do you do a search on the subject for the VN900? This is not easy to navigate.
Also, Electronic Jet kit sells the Gen 3 digital box with 6 settings for $250. Does any of you have any input on this compared with Dobeck 4 pot box for $170 on Amazon?
I am asking because I intend to get a K&N air filter or box with a larger filter in the future.
I would go with the Dobeck unit simply because they've been in the business for years and have their hand in the previous Power Commander fuel processors and now the Cobra Powrpro 2000. It's a simple unit that adds fuel and has a course adjustment.
The marble install is plugging a hose that originates in the back of the air cleaner and goes up to a solenoid valve near the backbone of the frame. Don't plug the hose that goes to the engine case because you'll blow out every seal keeping oil in the engine.
 

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Discussion Starter #8
OK, I got the ideea and I will let you know how it works.
The other question is how do I remove the stock air filter to replace with the K&N?
 

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Discussion Starter #9
I would go with the Dobeck unit simply because they've been in the business for years and have their hand in the previous Power Commander fuel processors and now the Cobra Powrpro 2000. It's a simple unit that adds fuel and has a course adjustment.
The marble install is plugging a hose that originates in the back of the air cleaner and goes up to a solenoid valve near the backbone of the frame. Don't plug the hose that goes to the engine case because you'll blow out every seal keeping oil in the engine.
I called Dobeck yesterday asking about the 4 pot unit and I was surprised when the cust serv guy recomended EJK 912-0275 for my bike. I think it is the same company now or this is their newer product of Dobeck because they call this new all digital box Generation 3 with 6 functions and it is described on their website. And yes, I would go with the regular 4 pot unit. Do you have this one? TIA
 

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Discussion Starter #10
Sojourner, I do not want to start the engine before I know for sure that this is the hose I was supposed to plug. Thank you
 

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Discussion Starter #11
OK, I did start the engine without the blue plug. I noticed a bit of pressure from the cylinders at the end of the hose and I decided to place a 1/8" hole on the blue plug.
Started the engine and there is a small air exhaust now from the blue plug's hole.
I will ride the bike tomorrow and let you know.
 

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OK, I did start the engine without the blue plug. I noticed a bit of pressure from the cylinders at the end of the hose and I decided to place a 1/8" hole on the blue plug.
Started the engine and there is a small air exhaust now from the blue plug's hole.
I will ride the bike tomorrow and let you know.
I believe you may have plugged the hose coming from the engine case. You should really trace the two hoses to their destinations to be sure.
 

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Discussion Starter #14
Yes, that hose is in between the air box and an air sensor or solenoid and it T's off from there to the 2 hoses on top of each cylinder. See the link from the above answer from Collinba. And I put that small hole in the plug so the residual mixture will not build up inside the system. Thanks all for your help.
Next thing on my list is the 34 tooth pulley from Cruiser Customizing. $160 shipped.
 

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About marbling, couldn't we just plug the hose, using a marble or anything else that could fit, way further up?
Or just plug where the hose starts getting rid of the hose altogether?
I am thinking about installing an homemade air intake following jeep pirate excellent example and also redirecting the crankcase breather in a proper manner.
 

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Ok, but what is a "yellow wire connector" ?
 

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You can go as far as removing all the hoses then install rubber caps on all the open nipples (6 each). Leave the solenoid wired up or you'll get a warning light on your gauge cluster.
 

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Thanks for this very graphic answer, I can't go wrong with that :)
 
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