hard starting and backfire after short stop - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 03-21-2012, 08:14 AM Thread Starter
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hard starting and backfire after short stop

On the way to work this morning I stopped at the local convience store for a couple items, when i went back out and tried to start the bike it cranked but would not fire...i checked the run/stop switch to make sure I had it on run (i have done that before) checked petcock to make sure it was on...cranked it again and after a few seconds got a loud backfire and started. This is the first time something like this has happened. Any ideas of what could have caused the problem?

Travis
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post #2 of 8 (permalink) Old 03-21-2012, 09:20 AM
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You need a new battery.... Guessing you do not have an AGM in there now?

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post #3 of 8 (permalink) Old 03-21-2012, 09:35 AM Thread Starter
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Yep I installed an AGM the day I bought it 2 years ago
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post #4 of 8 (permalink) Old 03-21-2012, 10:07 AM
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Well, you might want to have the battery load tested. Could just be bad gas?

SeaFoam it, install some NGK Iridium plugs and see if that helps. Look up the post on "pick up coil gap"

If it just started doing this, it's likely a carb or battery issue. Are you giving it gas when you tried to start it?

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post #5 of 8 (permalink) Old 03-21-2012, 01:55 PM
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check you gas tank venting system to make sure it is not clogged....mine did this same thing as a precursor to getting stranded with POOGS.
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post #6 of 8 (permalink) Old 03-21-2012, 07:51 PM
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This also sounds like the typical hot-start problems.

Check out this thread since you have the AGM battery already.

https://www.vn750.com/forum/showthread.php?t=18550

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
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1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

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post #7 of 8 (permalink) Old 03-22-2012, 07:55 AM Thread Starter
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Happened again on the way home yesterday when i stopped at the DMV to renew the tags on my wifes van. this time i did not give it any gas while cranking and did not get a backfire...I added seafoam and read the pickup coil mod and will probably be doing that in the next few days.

thanks for the help.

Travis
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post #8 of 8 (permalink) Old 04-04-2012, 08:09 PM
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+1 on replacing the plugs. My bike was doing the same. Leaning the mixture and a fresh set of plugs solved the issue for me (for now).
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