Trouble Starting When HOT? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 27 (permalink) Old 07-13-2008, 11:49 AM Thread Starter
 
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Trouble Starting When HOT?

I have my VN 750 now for five yaers (model 1996) , and I have always faced a recurrent problem when starting the motorcycle after using it . When my motorcycle is cool - starting goes up smoothe . But after using it for a while (lets say for more than 45 min) starting gets difficult. The starter and battery (ingnition system) opperate properly, but the motorcycle won't start easy, or right away.

You have to run the starter many times untill the motorcycle finally decides to run. Sometimes it won't run. When this happens the only way to put it into operation is by getting pushed by someone and put into run - or wait until it cools down and then it generally starts again.

*Observation the starter always works properly. The problem is getting the vehicule running.

The carbs has been services.
The battery is new.
The ignition motor has been serviced.
The plugs are new.
The plug cables are new.
The tank is clean.
The incoming charge received by the battery is OK. Checked.
The motor runs OK , after starting .
The temp level is OK.
The cooling sytem is OK.

What can be posibly wrong?
Appreciate your help and comments?

Regards,
Daniel
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post #2 of 27 (permalink) Old 07-13-2008, 11:54 AM
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is your bat an MF bat...i hear they fix a lot of hot start issues
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post #3 of 27 (permalink) Old 07-13-2008, 01:19 PM
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I had similar hot start problems. I tossed out the wet cell battery and replaced it with a maintenance free battery (MF) and have not had any problems since. I did relocate my R/R at the same time too, but I think the battery was the problem.

Glenn Douglas
Londonderry, NH
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post #4 of 27 (permalink) Old 07-13-2008, 06:24 PM
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Hard start

I've posted here previously about the hard start problem, especially after re-fueling. I have the dry cell, Iridium plugs, clean air filter and I'm still haveing the same problem. I just relocated my r/r to near the left wheel. My last recourse will be to follow Knifmaker's advice about re-gapping the pick ups. I've been putting this off because I have this strange feeling that Kawasaki would have known about this issue and if it was as easy to fix as correcting the pick up gap, they surely would have fixed it by 2006!
Keep posting, I'm curious what the advice will be !!

2005 VN750 purchased through E Bay 5,000 miles in 2006
Fan Switch
repaired pinched wiring for high beams
replaced reamed out mufflers with stock
New dry cell battery
saddlebags
saddlebag guards
Manual chain tensioners (new springs did not work)
windshield
cruise control (manual)
rear rack
moved r/r
Digital voltmeter
Pick up coil adjustment - YAHOO!!

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post #5 of 27 (permalink) Old 07-13-2008, 08:27 PM
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Like also mentioned many times over...Kaw didn't want to retool, this bike was only supposed to be a limited run which turned into 20 years.
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post #6 of 27 (permalink) Old 07-13-2008, 08:38 PM
 
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I had that problem when hot on my '98 which I bought last year and had tuned and serviced extensively. I put in a strong MF battery and learned to give the throttle a slight twist when hitting the starter. I seem to recall that the operator's manual recommended the twist. Anyway, it works for me now. Good luck.
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post #7 of 27 (permalink) Old 07-13-2008, 09:03 PM Thread Starter
 
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Thanks for your advice.

Which battery (reference & Brand) did you use ?
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post #8 of 27 (permalink) Old 07-13-2008, 09:05 PM
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Quote:
Originally Posted by zaak View Post
.....My last recourse will be to follow Knifmaker's advice about re-gapping the pick ups. I've been putting this off because I have this strange feeling that Kawasaki would have known about this issue and if it was as easy to fix as correcting the pick up gap, they surely would have fixed it by 2006!..........
That is a rather, lets just say "silly" assumption to make, and a lousy reason...

According to Kawasaki...there is no "Hot Starting" problem, just like there is no stator problem or R/R problem. Most dealers have no idea about the need to "lube the splines" or even how to do it.

Sitting back and waiting for Kawasaki to offer a fix on your bike , one they do not even produce anymore will likely just produce cobwebs , not results.

Perhaps when you are on the phone with them you could ask them why they did not use a Maintance Free AGM battery too.....(even Honda's little cheap scooters do...)


For me, just the MF battery and learning exactly how much gas to use when starting the bike did the trick 100% of the time...
The pick up gap fix reported by our freind Burke did work for him and others that tried it, I myself did not need to.

If you are not going to make an effort to even try the fix, then you should stop reporting your problem......


KM

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/
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post #9 of 27 (permalink) Old 07-13-2008, 09:09 PM Thread Starter
 
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I thought that the R/R only affected the battery charge and current flow when running.
Does it affect the electric flow in order to start ?
Because to tell the truth my battery has allways a decent charge.
The problem is getting the motorcycle running. The starter does run ..

I replaced the R/R not long ago. Though the problem existed long before.
Though I havent relocated the R/R . And it does get hot when running.
How does that affect , starting when hot ?

One more question . Does a bad stator affect the start too ?
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post #10 of 27 (permalink) Old 07-13-2008, 09:13 PM Thread Starter
 
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Another question why a MF battery change the problem. Does a MF battery works different than a Wet Cell Battery. ?

Which reference and brand do you recomend. ?
I have currently a brand new YUASA . YBS 14.
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