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Discussion Starter #1
Allow me to elaborate.

Got a hold of a 2007 Vulcan EN500. She will start right up, and idle just fine. But add throttle in to the equation, and this is where it gets weird, and I need the advise of more experienced bike mechanics.

Just a bit of throttle, everything seems okay. You get to about half twist, and the engine begins to bog like it is being flooded and almost dies. I let off the throttle completely, it quits bogging, and over revs AFTER the throttle has been completely released, and then returns to idle..

What have I done so far?

Removed, disassembled, cleaned top to bottom, reassembled, and synchronized the carburetors. Put everything back together as before, zero difference. Bogs down, let off throttle, over revs, returns to idle.

I hope that one of you brilliant people can help me figure out a fix, and I don't just find out that I'm just SOL
 

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Welcome clydeanator.

Are all the parts of the airbox intact? Specifically the ‘snorkel’ on top of it. If it is missing it will run like you describe.

If the top of the airbox looks like this the snorkel is missing: (ignore the four small holes in the picture)

https://sonofhidalgo.shutterfly.com/pictures/17

If it looks like this then the snorkel is in place and the problem lies elsewhere:

https://sonofhidalgo.shutterfly.com/pictures/15

Also make sure that the air filter is in place too.

Hope this helps.
 

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Discussion Starter #4
You are a genius my friend!

Tested using some duct tape to lessen that airflow, and my lord! The difference!

Now, can I replace just that snorkel, or do I need to replace the entire airbox?

Thank you very much!
 

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Discussion Starter #5 (Edited)
Welcome clydeanator.

Are all the parts of the airbox intact? Specifically the ‘snorkel’ on top of it. If it is missing it will run like you describe.

If the top of the airbox looks like this the snorkel is missing: (ignore the four small holes in the picture)

https://sonofhidalgo.shutterfly.com/pictures/17

If it looks like this then the snorkel is in place and the problem lies elsewhere:

https://sonofhidalgo.shutterfly.com/pictures/15

Also make sure that the air filter is in place too.

Hope this helps.
Well Biker Bill, my dad and I need to ride through Levlland and buy you a beer (or coffee whichever you prefer). We never would have thought of that. :grin2::grin2:

Honestly was starting to be afraid I had thrown away my money on my first bike. Faith restored!
 

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PM sent.

Someone probably removed the snorkel in the hopes to get extra airflow thru the engine but they neglected to adjust the fuel flow to compensate for the extra air. Also the snorkel is tuned to flatten out the torque dip at midrange engine speeds so it needs to be in place for best performance.
 

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I think we all tend to over-analyze problems. I know I do. I'd have also gone through the carbs, thinking that the problem(s) have to be there. Such a simple thing as the snorkel would never have entered my mind.

My 750 has a similar situation except in my case its a simple hose. This hose connects to the carbs somewhere (I actually know exactly how but can't remember right this instant.) and the other end MUST be in a dead air space. You can't plug it. You can't have it out in the open with moving air. It HAS to be open and in a place where there is no air movement.

If it isn't then the bike runs like crap. Its FAR more simple a fix than I would ever think about looking for.

Fear not clydeanator, your thought processes are normal.
 
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