Looking for HELP! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
VN750 General Discussion

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post #1 of 9 (permalink) Old 05-26-2016, 09:31 AM Thread Starter
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Looking for HELP!

At the end of a quick 20 mile ride the other day my 2002 750 lost power and started to backfire, lost power and wouldn't respond when giving it gas. Now when I start it (clutch open) it'll barely hit 1000 RPM, it'll rev if given gas but backfire allot. The oil light never came on and it ran at speed fine until that last mile. Again I'm no mechanic but am looking for some thoughts to tell a mechanic, and is something like this normal DURING a ride or more frequent when trying to restart. Any thoughts would be greatly appreciated.

Last edited by firstbike; 05-26-2016 at 04:33 PM.
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post #2 of 9 (permalink) Old 05-26-2016, 10:30 AM
..have a vulcan good day!
 
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Clogged fuel line ? ? ? ? - -

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #3 of 9 (permalink) Old 05-26-2016, 10:53 AM
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TOTALLY spitballing here, but what would happen if one of the ignition coils went bad?
Would the fuel make it through the non-firing cylinder and cause backfiring when the engine was up to temp?
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post #4 of 9 (permalink) Old 05-26-2016, 10:54 AM
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My guess would be air leaks? Maybe one of your vacuum lines or air lines got damage or became undone. Might want to check the intake boots and seals around the carbs. Also might want to check exhaust for leaks.

Even though you're not a mechanic, it might be good to do a quick visual inspection to see if there is anything loose or out of the ordinary. To check for air leaks, some people light up a cigarette and hold it up to the carbs or area of interest to see if the smoke is disturbed. Can also use incense sticks if you're not a smoker.

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post #5 of 9 (permalink) Old 05-26-2016, 10:56 AM
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Also sounds like it could be the POOGS (Phantom out of gas syndrom), or possibly a loose ground or battery connection.
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post #6 of 9 (permalink) Old 05-26-2016, 11:41 AM
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Yeah, first thing I'd check is if the carbs are getting fuel...easy to do, there's a drain screw on the bottom of each of them. Open them up, let what's in the bowls drain out, (make sure your petcock is NOT set to "PRI") and try starting the bike....fuel should start running out of each drain.

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post #7 of 9 (permalink) Old 05-27-2016, 09:58 AM Thread Starter
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Thanks for the suggestions hopefully one of them will get me back on the road without costing me my shirt.
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post #8 of 9 (permalink) Old 05-28-2016, 12:17 AM
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Results - Synopsis needed .... !

pls respond ....... - -
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'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #9 of 9 (permalink) Old 05-29-2016, 08:37 PM Thread Starter
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Is it possible an electrical issue caused this problem?
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