Oil going somewhere - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 35 (permalink) Old 11-22-2015, 11:33 PM Thread Starter
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Oil going somewhere

My '89 runs great,very smooth, 55mpg, but uses a little oil. It has 10.6k on it,when I got it w9 and checked plugs the rears had heavy white deposits on them. As I serviced it for winter layup I found heavy oily carbon on them. The engine is nearly out of frame but before I go further can anyone tell me if the vacuum valve assembly by the battery possibly allow oil to be pulled in? When I removed the large hoses the one going to the authors had a weird restrictor in it-a nickel with a small hole drilled in it. I initially thought it might be just valve seals-but not on just the rear I'd think. Any thoughts before I pull it apart? Thanks,GJ
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post #2 of 35 (permalink) Old 11-23-2015, 09:41 AM
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They were probably trying to stop the bike from popping with the nickle. We cal it marbling. As for oil, that would be from any number of gaskets, rings or valves. Are you sure it's using oil? How did you check? That sight glass is sht.

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post #3 of 35 (permalink) Old 11-23-2015, 11:59 AM
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The vacuum valve wouldn't cause oil consumption.

If oil is getting past a valve seal or valve guide, you should see buildup inside the port, on the valve stem, and the back side of the valve.

Carbon buildup can cause oil rings to stick. Another good reason not to use premium gas. Seafoam in the oil can dissolve carbon over time and free up stuck oil rings.

How much oil is it using? Mine is in great shape, but I still add oil once in a while. It doesn't get any carbon buildup on the plugs though.

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post #4 of 35 (permalink) Old 11-23-2015, 12:06 PM
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basically, if its not dripping out someplace (leak), it has to be leaving the engine via the exhaust.. and everything said above appies to that.

valve seals, rings, or even gaskets can cause it.

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post #5 of 35 (permalink) Old 11-23-2015, 09:39 PM Thread Starter
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Thanks guys,the front plugs are normal so I don't believe just the rear valve seals would fail so it must be cylinder/piston condition. Today I've been busy changing front hub on my oldest daughter's jeep. Tomorrow I'll get engine apart.
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post #6 of 35 (permalink) Old 11-23-2015, 09:55 PM
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post #7 of 35 (permalink) Old 11-24-2015, 10:16 AM
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Quote:
Originally Posted by guzzi john View Post
Thanks guys,the front plugs are normal so I don't believe just the rear valve seals would fail so it must be cylinder/piston condition. Today I've been busy changing front hub on my oldest daughter's jeep. Tomorrow I'll get engine apart.
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post #8 of 35 (permalink) Old 11-24-2015, 01:51 PM
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How much oil is a little? I've ridden/driven lots of vehicles that burned oil. Not a single one of them ever quit running. I just poured in more oil. I have one car right now that burns a qt. of oil in 200 miles. I put in half a qt. every 100 miles. Been driving it that way for 10 years. Compression is good. Has to be the valve guide seals. I clean the plugs every 6 months, and replace them once a year.

Do you know if your bike is a CA model (it will have 2 fittings at the back of the gas tank, below the front of the seat if it is) While I don't see how that could cause oil consumption, I would go ahead and remove all the emissions crap, including that 3 way valve and all the hoses. Cap off where the hoses connected to the front and rear cylinder head, the air box, and the rear carb. If it is a CA model, it will also have a bunch of emissions crap just above the front of the swing arm. Remove all that as well. It serves no purpose, and can cause starting and running problems, such as engine flooding and improper tank venting.

If the bike is running well, I would not tear the engine down looking for where the oil is going, unless it is using a LOT of oil. This engine holds 4 qts. and if you fill it to the top of the sight glass you should be good for several hundred miles. I would also use 20w50 oil if you are not already. If you do have a bad ring seal, the heavier oil will not leak past the rings as bad as lighter oil. Also, if oil is getting past the rings, that indicates wear or damage, which might extend to other things, like bearings. There should not be enough normal wear at 10K miles to cause oil burning. That is barely broken in.

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post #9 of 35 (permalink) Old 11-24-2015, 03:02 PM
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20/50 might cause clutch issues, as it has on a few bikes on here(Mine included)

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post #10 of 35 (permalink) Old 11-25-2015, 12:31 PM Thread Starter
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Head is off neither intake shows valve seal issues so must be rings. Bore looks good but clutch nut is not coming loose so can't pull barrel yet. I even true some heat but it seems tighter than the 96# listed. If it were air cooled I'd understand a rear dying but who knows. I may have a Gremlin issue. As there's a full moon I'll consult the Runes tonight.GJ
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