Won't start (help diagnose) - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 04-05-2009, 12:48 PM Thread Starter
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Won't start (help diagnose)

It's been a while, and I'll fully admit to neglecting my Vulcan over the winter, but have brought the wrenches and rags back out and am trying to get her nice and happy.

She won't start.

Starter sounds like it's spinning fast and fine, and every now and again I hear something that sounds like it's the start of an ignition, but it just falters (crank-crank-crank-Poof-crank-crank).

What I know.

Air filters are clean and well oiled.
Drained Tank and Carbs, refilled with good gas and a full can of seafoam.
Compression felt good -- real good on the front, ok on the back.
Spark plugs -- I don't know I'm not a good read. The back two seemed a bit wet, the front ones didn't look so hot. All four were purchased last summer and are iridium plugs . . . and last year was a lighter riding year for me.
I'm also not so sure of the spark on the plugs. I only saw one spark from one plug when testing, but am curious if that was just because of bad eyesight and bright daylight.

There's a good chance bad gas stuck something in the carbs, but I was hoping I wasn't going to have to pull them as I'm still a beginning / middling mechanic at best.

Thoughts?

http://www.scurvysvarog.com/vn750/
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post #2 of 12 (permalink) Old 04-05-2009, 01:26 PM
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Do you have a MF AGM battery and is it rully charged? If you have a wet cell battery and if if is not fully charged the engine will turn but not start. You should not have to change the plugs.


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Last edited by lance328; 04-05-2009 at 06:08 PM.
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post #3 of 12 (permalink) Old 04-05-2009, 01:29 PM Thread Starter
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Forgot to add that in there.

Yup, MF battery that was new as of september (?). Fully charged. I've pulled and it and put it back on the trickle charger a few times, since I feel I keep wearing it down with starting attempts.

Might pick up some new spark plugs while I'm out running errands.

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post #4 of 12 (permalink) Old 04-05-2009, 01:40 PM
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When you filled with gas did you set the petcock to prime and let it sit for about 5-7 min. then turn back to run. Then wait about 10-20 min. then try to start, prime lets gas flow into the carb to fill the bowl and let the vapors in, the seafoam will help. Empty carbs need some time to fill up.


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post #5 of 12 (permalink) Old 04-05-2009, 05:23 PM
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Check the choke plunger. My 93 wouldn't start last summer either no matter what I did to it. Come to fine out the choke plunger and broken in the down position and could not be raised. Once I got it out the Vulcan started right up.

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post #6 of 12 (permalink) Old 04-05-2009, 05:44 PM
 
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first i would make sure the battary is good.... i bought a mf battery and it was awesome.. over winter i moved her to a storage unit and a week later i moved it back to my house... now when i went to ride her back to the house she would turn but not start.... i ended up just jumping it off of the jump pack i have and she started up right away.... if you have the 36$ to spare go to an advance auto and grab a set of iridium plugs.... work wonders... and then make sure you have a good spark..
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post #7 of 12 (permalink) Old 04-05-2009, 06:27 PM
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When you say the filters are "well oiled", are the damp with oil, or dripping with oil?
They shouldn't be soaking wet.


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post #8 of 12 (permalink) Old 04-05-2009, 08:47 PM Thread Starter
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Quote:
Originally Posted by billryx View Post
When you filled with gas did you set the petcock to prime and let it sit for about 5-7 min. then turn back to run. Then wait about 10-20 min. then try to start, prime lets gas flow into the carb to fill the bowl and let the vapors in, the seafoam will help. Empty carbs need some time to fill up.

See, it's always the simple things. This did it right up. I thought reserve and PRI were pretty much identical, but I guess not.

Just took her for an hour ride or so and everything felt nice. Still have quite a bit of spring sprucing do to on her. But at least she started up and sounded alright.

To answer other questions:
I'm pretty sure the battery is fine, may take it in to check out anyhow.
The plugs that are in there are currently Irridium plugs. When I first installed them they were fantastic, which is why I was gonna be miffed it was the plug. I expect it was just a case of two of them being pretty wet from an open float /stuck needle / whatever. (yay flooding).
Hyper, the filters in the ears were fine. Moist with oil, nice and greasy feeling, but not enough that it was leaking.

Thanks all. I'm sure I'll be asking about more problems soon enough.

http://www.scurvysvarog.com/vn750/
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post #9 of 12 (permalink) Old 04-05-2009, 08:48 PM
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Sometimes to much of something is not really all that great A whole can of sea foam is a little much for that tank I have seen bikes not run simply for that reason.
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post #10 of 12 (permalink) Old 04-05-2009, 09:02 PM
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You can jump start it from your car bat to keep from running your bat down.

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