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after my bike warms up it sometimes wont start and will backfire if i keep trying it not sure why i read elsewhere here someone else discussing the problem any insight or fixes?
 

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after my bike warms up it sometimes wont start and will backfire if i keep trying it not sure why i read elsewhere here someone else discussing the problem any insight or fixes?


Most hot starting problems are solved by installing an AGM battery in place of the standard wet cell. It's the #1 reccomended thing to do to a stock bike.
 

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FREEBIRDS MC CENTRAL NY
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Sounds like the float needles in one of the carbs are sticking and ts flooding out.try looking up the Wolfie backblow method

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FREEBIRDS MC CENTRAL NY
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Usually mine would only have problems starting cold with a wet cell.would start fine when warmed up cause would get a little charge.

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I also recommend the AGM type battery, but mine starts best if I don't touch the throttle. It backfires and doesn't start if I crack the throttle when warm, without throttle it starts in half a turn.
 

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FREEBIRDS MC CENTRAL NY
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..have a vulcan good day!
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for your reference...............
Manufacturer . Model . CCA . . . .Availablity . . . . . . Additional Notes
BatteriesPlus X2-15L 210CCA BatteriesPlus Deka = ETX15L re-branded- - $95.00 Store-Nov-2012
Big Crank ETX15L 210CCA Online Retailers, eBay Deka = ETX15L re-branded --- Ebay - $68.00 Nov-2012
Deka ETX15L 210CCA Online Retailers, eBay
Die Hard 44005 210CCA Sears YUASA = YTX14AHL-BS re-branded $80.00-Store Nov-2012
EverStart ES14AHBS 210CCA Walmart Terminals are swapped, so install backwards and remove bottom spacer. UPDATE: Dec 2012 = $89.99
Interstate CYTX14AHL-BS 210CCA Retailers YUASA = YTX14AHL-BS re-branded
MagnaPower ETX15L 210CCA Advance Auto Parts Deka = ETX15L re-branded -
Manga Power 12v Sealed AGM 220CCA ($81.99 – April 2013)

WestCo 12V14L-B 220CCA WestCo
YUASA YTX14AHL-BS 210CCA Online Retailers, eBay $78.00 online Dec-2012 ----$88.00 Dec-2012
Magma Power ETX15L 220 CCA Advance Auto Parts 220 CCA $77.00 - Online -Take 15% off -Enter code DEM11 at checkout. Online Only.

Scorpion YTX14AHL-BS Scorpion 12v 210 CCA AGM BatterieStuff.com $66.00 + Sept 2013
BatteryStuff Part #: sYTX14AHL-BS Replaces: YTX14AHL-BS, YB14L-A2, YB14L-B2, 12N14-3A,CB14AL-A2

NOTE: Ebay / Online prices quoted above are from a single online 2012 search, additional search’s may produce different prices.
 

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Most times a backfire is due to a weak battery, so I think you are on the right track.

I also suspect a lean fuel issue....such as POOGS or clogged fuel line/petcock....it might be worth looking into, but definately get an AGM battery installed either way.
 

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FREEBIRDS MC CENTRAL NY
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Stupid me.come to think about it I still had a wet cell in her when I was having carb issues.did the agm around that time.but even with the carbs correct never had the backfire when warmed up.sorry for the brainfart.

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Mine had that problem it wasn't venting right through the gas tank . It would vapor lock, hard to start and backfire took the gas cap apart cleaned it and it hasn't done it since.
 

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1985 VN-700
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if my voltage is low it does this. once i charge the battery. vroom right up. especially if i crank it a little and run it down. sucky vulcan design. I want my cdi and a kickstarter
 
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