Urgent! VN won't start. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 69 (permalink) Old 03-17-2014, 09:18 AM Thread Starter
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Urgent! VN won't start.

Hey,

I bought a vn750 -87, which had been sitting for a few years. I got it quite cheap, so I took it.

The previous owner didn't have time to work on it. He had diagnosed the problem to the IC ignitor. I took his advise and bought a new IC ignitor and coils. Then I bought a new battery and tried to start it. I didn't get it running, before the battery ran out. I recharged the battery and tried again. Same problem, didn't start. But at the same time the startermotor started acting up. Sometimes it cranks once and stops. This goes on for quite sometime, but then it starts starting again like really good, but won't run.

I replaced the battery (it's a gel type battery). Same problem, the starter cranks once and stops. Some times it starts rotating like it should, but won't start the engine. It sounds like it starts catching, but won't start running.

I checked the spark, it had a good spark. I checked the ground connections, all seemed fine, I cleaned them, just in case it would help. Didn't help. Checked the starter relay (solenoid). It seemed fine, clicks once and multimeter reads 0.02 ohms (though it spikes first up to 14ohms, but then settles to 0.02ohms)

I tried bridging the relay terminals and the starter turned fine for a few times, but the thing I used for bridging started to weld on to the relay nuts. It sparked quite a lot.

I don't know what do next. Should I disassemble the startermotor or what?

What could cause the starter anomaly?? Sometimes it cranks constantly, then sometimes cranks once and stops, eventhough the button is pressed.
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post #2 of 69 (permalink) Old 03-17-2014, 09:36 AM
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An electrical short? I'm not a zap zap buzz guy. Wait for slim Vulcan rider, he might be able to help if it's electronic
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post #3 of 69 (permalink) Old 03-17-2014, 09:38 AM
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Have you tried holding in the clutch lever while trying? Also don't hold that starter down for an extended period. Could be the clutch needs adjustment. Could be a wiring issue. Could be the starter needs to be cleaned out and rebuilt. These are only a few ideas but I'm sure more people with more experience will chime in.

Also welcome. Where are you located? There might be a member close by that can give you a hand in person.

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post #4 of 69 (permalink) Old 03-17-2014, 09:40 AM
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Clean that damn ignition switch under the key!

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post #5 of 69 (permalink) Old 03-17-2014, 10:24 AM Thread Starter
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I have tried holding in the clutch, but it didnt have any effect.

Some more background information:

I washed it with a pressure washer after I got it and used three plastic bags to cover the surge tank and the sylinder head exhaust ports, because I had removed the mufflers and exhaust system. After it had dried, we put in the battery and tried to start, but it didnt start, however, the starter seemed to be working well. Then we pulled the plugs, cleaned them and checked the spark; everything was working there. We also checked the fuses and the resistance of the coils and ignitor (its readings were somewhat different from the manual, but it was from a working 86 bike). One of the coils showed 0.2 ohms more resistance, however, I was getting a spark at every plug (blue and strong). Then we recharged the battery, and the engine started on the first try. I went on to warm it up for a little while and put in the first gear and drove for about 10 meters when the engine died. After that it wouldn't start anymore.

We assumed it was a carb related problem and drained them; some gas came out. Then my brother and I started to disassemble the carbs and he found he had left one of the plastic bags in (the one covering the surge tank) and it was sucked into the air ducts. We pulled it out, and assembled everything and tried to start it, but it then the starter motor didn't seem to be working anymore. This is where we are now. So, we actually got it to run well for a while, with the plastic bag in the air ducts, but now it seems that the starter motor is not working proprly. In addition, I cleaned the petcock and found out it was missing the vacuum valve spring, but i replaced it with another spring (not original, will try to get one though; it worked previously with this spring, so I don't believe it is a petcock/fuel supply problem).

I am now going to start taking apart the starter motor to check it, but other than that, and going through the carbs, I don't know what else to try.

I appriciate the advice from everybody.
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post #6 of 69 (permalink) Old 03-17-2014, 10:33 AM
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Could be a dead spot in the starter armature or worn brushes, but before you take the starter off ...

Check and make sure you're getting consistent 12v on/off to the solenoid from the start button.

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post #7 of 69 (permalink) Old 03-17-2014, 10:57 AM
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Probably fried the starter by cranking it too long

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post #8 of 69 (permalink) Old 03-17-2014, 12:14 PM Thread Starter
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Just disassembled the starter motor according to the manual instructions. All of the readings seem fine, except 1 reading between the metal plate and the brush holder ( on the 2M ohm range the reading is .951 when its supposed ot be zero ohm). The whole thing is kind of dirty with black resídue everywhere; I am cleaning it up now. I am not very experienced with electrical starters, but it has a kind of burnt smell (electric burnt smell if that makes any sense). Any ideas? The armature checked fine.

Also Spockster, what do you mean on/off to the solenoid? Do you mean 12v when i dont press start and when i do?

Last edited by VNewbie; 03-17-2014 at 12:49 PM. Reason: question added
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post #9 of 69 (permalink) Old 03-17-2014, 12:56 PM
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Quote:
Originally Posted by VNewbie View Post

Also Spockster, what do you mean on/off to the solenoid? Do you mean 12v when i dont press start and when i do?
Yes. You can check by voltage or continuity.

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post #10 of 69 (permalink) Old 03-17-2014, 04:11 PM
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Clean the switch

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