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Discussion Starter #1
i have a 2009 vulcan 900 custom that has right at 9000 miles. It just recently developed a problem of bogging down with anything more than 1/4 throttle it will bog down and i might as well pull in the clutch and let it idle. If I start it up in the morning and let it come down off fast idle and take off it will be fine for about 10 minutes then start acting up. if I stop to get gas or whatever then come back out it will be fine for another 5 minutes then act up. Also the longer I ride it the worse it gets. It will do this in every gear and even in the driveway sitting in neutral. Any and all help is greatly appreciated. To add to the post I have previously replaced the stator (since it was no longer charging and killed the battery), I had vance and hines slash cut exhaust on it but put the stock pipes back on to see if the problem went away which it didnt. I have a video of it showing what its doing but Im having problems uploaded on here. It says mov format is not allowed. Anyways I hope you guys can help.
 

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Discussion Starter #3
I've already replaced the spark plugs. And I checked the air filter about 500 miles ago. Also I've ran a couple different fuel additives through it the last 1000 miles.
 

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Check your battery terminals for tightness again. I highly doubt that's the problem but we will start with the easy stuff. Also make sure any connections you made when replacing the stator are tight and locked in. Look at the back of the plugs to see if some how a pin didn't push out of the connector. How long did the bike sit with gas in it, was any stabilizer used during this period?
 

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Discussion Starter #6
While I've had the bike it hasn't sat for longer than a week. Battery terminals are tight as I've already triple checked them. I rechecked the voltage readings on the stator plug to the voltage regulator as well as checking for short to ground. Everything is good there. I have checked fuel pressure probably about a month ago. It was right at 300kpa at idle and also on first key on. I couldn't get it to act up while checking fuel pressure. Also when I checked the filter I didn't completely remove it from the bike I just took the black cover off and took a peak. I will remove the entire thing tomorrow to make sure it's not clogged up.
 

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I'm not too familiar with the bike, is the filter and in line filter or is it on the fuel pump pick up tube? If it's in line, just pop it off, flip it around, cycle the key to pump some gas through it the wrong way. Then install it the right way and try again.

Hopefully it's an easy fix so you don't have to stare at your bike everyday like I do.. Lol
 

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At 9k would the valves even be an issue?
 

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Doubtful that it is a valve problem at 9000 miles as they are not scheduled for their first check/adjustment until the 15000 mile mark.
 

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Flow tests are great ways to find a bad fuel pump. Another good test was giving your 8 year old a small hammer, lock them in the trunk and make them tap on the fuel pump the whole way home.... Lol. If the cow and pressure tests pass, don't just automatically rule out the pump.
 

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Discussion Starter #18
Yes I just did the fuel pump flow test tonight. Had 40ml with the pump running for 3 seconds. Then I hooked up a fuel pressure tester inline so I could still start it and get it to act up. With key on it was 300kpa. With it running the gauge was bouncing from about 200kpa to 300kpa. While revving the engine (without it bogging) it was steady at 225kpa. With it at full throttle and bogging down it drops to 50kpa. I also checked the voltage to the pump. Key on it has 13v while running it had 13.5v. While bogging down it still had 13.5v
 
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