hot and cold start problems. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 02-18-2010, 02:51 AM Thread Starter
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Question hot and cold start problems.

hi.

the only way i can get my 2004 vulcan to start. both when its cold and when its hot, is to turn the idle screw way down.

ive put new plugs in and ive relocated the R/R. i do have drag pipes now but it was doing this when i had the stock exhaust too. im going to try seafoam tomorrow. ive read it works miracles on our bikes. but does anybody have any other ideas?


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post #2 of 16 (permalink) Old 02-18-2010, 09:50 AM
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Have you replaced the battery with an AGM maintenance free version yet? This solved my warm start issues on a 2006 model (didn't have a cold start issue).


Chris Glennon - Portland, OR
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post #3 of 16 (permalink) Old 02-18-2010, 11:22 AM
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And if your new plugs aren't iridiums, they do give a very good spark. When I bought my bike, it had standard plugs with only 350 miles on them. Replaced the battery with AGM and put in iridium plugs. Man, what a difference!

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post #4 of 16 (permalink) Old 02-18-2010, 01:01 PM
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Juggel you can also try the ignition coil pickup adjustments, they are located in the stater area. You just have to pull off the stater outer cover, only three screws. There is a write up in the forum threads covering the whole procees. The pickups come set with a gap of some where between 30 to 40 thousands of an inch. You need to get them down to about 18 to 20 thousands of an inch. This should take care of all the cold and hot starts, along with the plugs and AMG battery.

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Last edited by weh44att; 02-18-2010 at 01:10 PM. Reason: and a word
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post #5 of 16 (permalink) Old 02-18-2010, 01:58 PM
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Quote:
Juggel you can also try the ignition coil pickup adjustments, they are located in the stater area. You just have to pull off the stater outer cover, only three screws. There is a write up in the forum threads covering the whole procees. The pickups come set with a gap of some where between 30 to 40 thousands of an inch. You need to get them down to about 18 to 20 thousands of an inch. This should take care of all the cold and hot starts, along with the plugs and AMG battery.
__________________
Be mindful, that this mod is not a simple adjustment, and is not completely irreversible.
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post #6 of 16 (permalink) Old 02-18-2010, 04:14 PM
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Quote:
Originally Posted by juggalo62989 View Post
hi.

the only way i can get my 2004 vulcan to start. both when its cold and when its hot, is to turn the idle screw way down.

ive put new plugs in and ive relocated the R/R. i do have drag pipes now but it was doing this when i had the stock exhaust too. im going to try seafoam tomorrow. ive read it works miracles on our bikes. but does anybody have any other ideas?



Are you using the choke to start the bike when it is cold?

Does it seem to run fine once you start it (guessing you turn the idle back up then?)

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post #7 of 16 (permalink) Old 02-18-2010, 06:23 PM
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Quote:
Originally Posted by slimvulcanrider View Post
Be mindful, that this mod is not a simple adjustment, and is not completely irreversible.
The mod takes about 30 minutes and is completely reversable. I have done this on 8 engines and no one has asked to change it.


85 VN700 "Old Yella"

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post #8 of 16 (permalink) Old 02-18-2010, 08:06 PM Thread Starter
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what i have to do is wait for it to fire without choke then kind of juggle the gas and choke til it stays running...

also if i do turn the choke on while its turning over it seems to crank slower. it does the same thing if i give it gas.

im thinking something electrical as well.

windshield.
red leds.
straight pipes.
vroc number 25695
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post #9 of 16 (permalink) Old 02-19-2010, 01:21 PM
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The Vulcan 750 is known for starting problems. Owners have done all kinds of things to try and solve the issue. I have not messed with the ignition coil pickup adjustment, but I did install an AGM battery, gapped the plugs just a hair less than what the manual calls for, removed and thoroughly cleaned the inside of the starter, and have turned the pilot screws out a full 3 turns. If started every day or two, it starts fine. If you let it set for a week, it can be hard to start. I believe this is caused by gas evaporating out of the float bowls.

Seafoam is good stuff, but costs about the same as it's weight in gold. For that reason I don't use very much of it. What I do, is about every 3 months, drain the gas out of the carbs, disconnect the fuel lines from the petcock, and fill the float bowls full of Seafoam through the fuel lines, let it soak for 24 hours, then drain it out. I use the remainder of the 16 oz can in the next 2 tankfuls of gas. I have 4 other bikes, and don't use Seafoam in any of them, I only use it in the Vulcan because it is such a PITA to remove and clean the carbs.

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post #10 of 16 (permalink) Old 02-19-2010, 07:52 PM
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Quote:
Originally Posted by weh44att View Post
Juggel you can also try the ignition coil pickup adjustments, they are located in the stater area. You just have to pull off the stater outer cover, only three screws. There is a write up in the forum threads covering the whole procees. The pickups come set with a gap of some where between 30 to 40 thousands of an inch. You need to get them down to about 18 to 20 thousands of an inch. This should take care of all the cold and hot starts, along with the plugs and AMG battery.
Quote:
Originally Posted by slimvulcanrider View Post
Be mindful, that this mod is not a simple adjustment, and is not completely irreversible.
Quote:
Originally Posted by lance328 View Post
The mod takes about 30 minutes and is completely reversable. I have done this on 8 engines and no one has asked to change it.
slim, I think you meant to say the mod is not reversible, or that it is irreversible, which means the same thing. By trying to emphasize irreversible with "not", you have a double negative (ir and not, which equals a positive), which means exactly what lance says- "completely reversible".

Gordon

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Purchased May 16, 2008
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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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