bike wines over alot - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 04-11-2010, 11:42 AM Thread Starter
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bike whines over alot

i just bought a 1985 vulcan 750 and noticed it whines over a lot before starting even when the bike is warmed up? this morning when i tried to start her she backfired a couple of times any suggestions?

Last edited by bunyan; 04-12-2010 at 05:25 PM.
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post #2 of 15 (permalink) Old 04-11-2010, 12:54 PM
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Merlot or Chablis?

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1989 Kawasaki Vulcan 750

Upgrades so Far:
Coastered
R/R relocated
Analog Voltmeter
PFIII Windshield
RAM GPS Mount w/Garmin GPS
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Saddlemen's Classic Explorer Seat
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LED Tail Light
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Engine Guard w/Highway Pegs
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post #3 of 15 (permalink) Old 04-11-2010, 01:30 PM
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sounds like a week battery...get an mf batt.
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post #4 of 15 (permalink) Old 04-11-2010, 03:36 PM
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Ohh forgot to mention.... WELCOME to the forum... Congrats on the new bike... Check out the Verses, Be sure to do a spline lube, (it will save you a lot of greef in the long run, and... you found the best source of information on the planet for your bike. 7,000+ members here with loads of information on everything from doing an oil change to the complex stuff like rebuilding an engine.
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post #5 of 15 (permalink) Old 04-11-2010, 06:53 PM
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Quote:
Originally Posted by asbrand View Post
Merlot or Chablis?
did you forget the cheese asbrand?




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92 vn750(sold)
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post #6 of 15 (permalink) Old 04-11-2010, 07:12 PM
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Check out hard starting in the search area. Welcome to the club and a nice riding bike.
Several things can make a bike hard to start, there are many ideas and things to do to the bike to help with cold starts and hot starts. Check out the threads and then if you still have questions, fire away. We are here to help.

2004 25,500 miles
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iridium plugs
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post #7 of 15 (permalink) Old 04-12-2010, 09:39 AM
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If its doing this on cold or hot starts, it usually is a weak spark. Lots of potential causes for weak spark, including a battery that's being used up by the starter and not enough leftover voltage to give the plugs a hot enough spark. If the plugs are fouled, they will be weak. If your wiring to the coils has some corrosion in the connectors or the wiring is just plain weak, it will cause a weak spark too. A weak spark gives you symptoms like a rich running condition, and can cause some fierce backfiring when trying to start the bike.

If you are running with a wet cell battery, one with caps on top and a drain tube, you need to replace it with a maintenance free AGM battery. These have more cold cranking amps and can make all the difference in how a bike starts. The iridium plugs can also make a difference.

With your battery fully charged, check it's voltage with the ignition key turned on. Then with the key on, check your voltage at the coil power wire (red/yellow). The voltage should be close to the battery voltage. If it has dropped by a volt or even more, you might want to consider re-wiring the coils straight to the battery through a relay. Check the link in my sig for the procedure.

Fergy
Kyle, TX VN750.com member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
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Last edited by fergy; 04-12-2010 at 10:47 AM.
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post #8 of 15 (permalink) Old 04-12-2010, 11:22 AM
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Quote:
Originally Posted by bunyan View Post
i just bought a 1985 vulcan 750 and noticed it wines over a lot before starting even when the bike is warmed up? this morning when i tried to start her she backfired a couple of times any suggestions?
Just some FYI, not related to the starting problem....
Unless you are not in the U.S., your '85 is most likely a 700, not a 750.

As to the starting issue, I'd start with getting the battery checked too. The maintanance free battery is the way to go!!


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post #9 of 15 (permalink) Old 04-12-2010, 01:19 PM
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Quote:
Originally Posted by hyperbuzzin View Post
Unless you are not in the U.S., your '85 is most likely a 700, not a 750.
That is a reasonable assumption to make but not an altogether correct one.

In the UK, for some reason that I simply cannot fathom, factory customs hold their 2nd hand prices extremely well and every few years when the Pound has a good day against the Dollar our dealers will hop over to your side of the pond and buy up very low mileage bikes from sunshine states at what are stupidly low prices in our currency terms and ship them back by the container load where they can rip us off royally. The result is a surprisingly large number of American(Californian) spec custom style bikes in our market. About 1 in 5 of the HDs seen for sale in these parts seem to be pre-loved imports.

In a similar fashion, as is the case right now, when the Pound is low against the Euro, the mainlanders will buy from us in droves. Which will eventually lead to American spec bikes being common there too.

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post #10 of 15 (permalink) Old 04-12-2010, 05:27 PM
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Welcome to the madness bunyan. See link in sig line for more info on batteries and spark plugs etc.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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