Reoccurring Oil Light - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 10-04-2015, 04:13 PM Thread Starter
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Reoccurring Oil Light

Good afternoon gentlemen,

I recently did an oil change on my bike. I did it correctly (I did not opt to prime the filter, though in the future I will) and turned the bike over and the oil light went right off. I let it run for a few minutes and d left it alone for the rest of the day. The next day I rode to and from a store (15 miles in total) and the bike ran beautiful.

This is where it gets interesting. The day after that, I went to ride an hour too school and got one minute down the rode to pump gas and noticed the oil light had come on. Bike sounded good, oil level was perfect, and no leaks so I proceeded. Maybe got another two miles before I felt like the bike was losing power. Pulled it into a parking lot and came back a few hours and the light was still on. It would still turn over though. Later that night I tried burping the engine with the spark plugs out but just killed the battery. The following day I ended up charging the bike and got it running; I then loosen the oil filter a little bit, ran the bike until oil came spitting out and tighten up the filter (burping). This worked and the oil light came off, I let it ran for five minutes to make sure and made the 10 minute ride home.

The next and to be last ride of the year, I went to meet my friend at his house, a twenty minute drive. She was running great. We ended up getting drunk so I had to come back the next day for the bike. Well I started her up, letting her warm up, and the oil light was back on!

So now she is sitting at my buddy's house waiting to be trailer-ed to my storage shed. What could possibly be the problem? If you need anymore information or something clarified just let me know. Thank you in advance for your time.

TL,DR
Bike ran fine after oil change. Then oil light came on. Burped it and was fine for another two short rides. Then oil light came back on.

2004 VN750

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post #2 of 23 (permalink) Old 10-04-2015, 06:50 PM
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hmm, burping once should be all it takes.. twice.. maybe.. more than that, not really normal.

what oil and filter did you use? Its VERY important that the filter has an anti-drain back valve. also possible the valve in the filter is defective and allowing the air bubble to reform.

also, I have seen warm oil cause an intermittent oil light, if its too thin, or poor quality.

check for loose connection at the oil sending unit (front of engine, not far from the filter). could also have an intermittent short to ground in the harness (check around the neck), the light comes on when the lead to the sender gets grounded (low pressure closes the switch in the sender, one side of the switch is grounded thru the sender/engine).

does the oil light go out if you rev it a little? if so, suspect oil quality issue, or a flakey sender unit

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post #3 of 23 (permalink) Old 10-04-2015, 09:54 PM
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My oil light started coming on at cold starts idling under 2000 rpm. If I raised the rpm, it would go off. Considered putting an oil gauge on the bike to monitor pressure, but after I used Seafoam in the oil for another problem (sticky valve), the oil light hasn't come on since. Have to assume it was a dirty oil sender. Ran the Seafoam 300 miles before an oil change.

Did your light come on in all rpm ranges, or just at idle?

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post #4 of 23 (permalink) Old 10-04-2015, 10:00 PM
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Quote:
Originally Posted by michiganteddybear View Post
hmm, burping once should be all it takes.. twice.. maybe.. more than that, not really normal.

what oil and filter did you use? Its VERY important that the filter has an anti-drain back valve. also possible the valve in the filter is defective and allowing the air bubble to reform.

also, I have seen warm oil cause an intermittent oil light, if its too thin, or poor quality.

check for loose connection at the oil sending unit (front of engine, not far from the filter). could also have an intermittent short to ground in the harness (check around the neck), the light comes on when the lead to the sender gets grounded (low pressure closes the switch in the sender, one side of the switch is grounded thru the sender/engine).

does the oil light go out if you rev it a little? if so, suspect oil quality issue, or a flakey sender unit
X2, Also 2 things. Are your rpm's at idle above 1100 rpm. Have you pulled the tubular screen out ( inside the left side drain plug ) to see if it is clean or plugged up and installed correctly?

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post #5 of 23 (permalink) Old 10-05-2015, 12:52 PM Thread Starter
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Mobil 1 10w-40 Synthetic for oil.
Purolator PL14610 PureONE for oil filter.

Oil light stays on no matter how I run the bike.

In response to the sender unit being grounded - the bike doesn't run right if I try to ride it with the light on. The send unit being grounded would only trigger the light and not affect anything else, correct?

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post #6 of 23 (permalink) Old 10-05-2015, 12:56 PM Thread Starter
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JM2001 -
M y bike idles around 1250. Also, I had my finger inside the drain plug hole pretty deep and couldn't find the screen. I did an oil change the beginning of this year and was unaware of checking for the screen. After that oil change the bike oil light wouldn't turn off while i road for a few miles, but after letting her sit for a few hours resolved this issue.

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post #7 of 23 (permalink) Old 10-05-2015, 01:58 PM
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oil light should not have any effect on how it runs, unless it is of course lacking oil pressure, which could cause problems.

are you using auto 10/40 or motorcycle 10/40? it does make a difference, due to the different formulation for use with wet clutches

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post #8 of 23 (permalink) Old 10-05-2015, 05:27 PM
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Quote:
Originally Posted by michiganteddybear View Post
oil light should not have any effect on how it runs, unless it is of course lacking oil pressure, which could cause problems.

are you using auto 10/40 or motorcycle 10/40? it does make a difference, due to the different formulation for use with wet clutches
He didn't say viscosity. Mine did just the same with 20/50

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post #9 of 23 (permalink) Old 10-05-2015, 05:50 PM Thread Starter
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Quote:
Originally Posted by michiganteddybear View Post
oil light should not have any effect on how it runs, unless it is of course lacking oil pressure, which could cause problems.

are you using auto 10/40 or motorcycle 10/40? it does make a difference, due to the different formulation for use with wet clutches
Regular oil. Same oil I used for my first oil change with the bike and everything ran fine. After talking to some friends, Ill probably spend the extra money next time and get the motorcycle variant.
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post #10 of 23 (permalink) Old 10-05-2015, 07:02 PM
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Losing power could mean the lifters aren't getting pressure, you probably should hear the rockers ticking, but that depends if the lifters are totally flat or not. Losing power could also mean the crank, rods, and pistons, are seizing.

The only way to know is to thread an oil gauge in place of the oil sender and read the pressure. Sounds like it is at least pumping some oil, if it surged out while cranking it.

There's a vertical oil drain bolt on the bottom of the case, and there's a horizontal 1 1/4" oil screen cap near the left footpeg. Behind that cap is a screen tube about 1" Dia x 3-4" long. It's best to drain oil from this cap, after draining from the lower plug, because some oil gets trapped behind it. That also allows you to check the screen each oil change.




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Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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