MNSBR: Crankcase Filled With Oil - MNSBR

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Crankcase Filled With Oil zuma 50 2stroke

#1 User is offline   tall guy Icon

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Posted 20 April 2015 - 04:40 PM

So haven't rode my zuma in about two years. I went to start it this spring and it was locked up. I pulled the spark plug and it was soaked in oil and the top end was full with oil. (I know now why it was locked up). So I took the intake and reed valves out and found the crankcase full of oil also.
1. Has anybody had this same issue?
2. What did you find was the problem?
3. How did you drain the oil from the crankcase.

I'm trying to avoid taking the jug off and/or split the case if at all possible
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#2 User is offline   henks Icon

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Posted 20 April 2015 - 05:09 PM

Have Anna pick it up and hold it upside down? :duno:
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#3 User is offline   tall guy Icon

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Posted 20 April 2015 - 05:24 PM

Good idea
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#4 User is offline   Sean298 Icon

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Posted 20 April 2015 - 06:37 PM

Suck it out with a small vacuum. I've got a brake bleeder that I use for all that kind of crap.
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#5 User is offline   Beckett Icon

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Posted 21 April 2015 - 06:10 AM

You can bring it over and have two fucked zumas in the garage. Well, mine runs at least... the clutch needs to be rebuilt from my 5 minutes of looking at it...
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#6 User is offline   tall guy Icon

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Posted 21 April 2015 - 08:12 AM

I'll trade your problem for my problem
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#7 User is offline   Yamanube Icon

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Posted 21 April 2015 - 11:09 AM

Having a crankcase full of oil is probably one of the better problems to have, is the bike still oil injected?
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#8 User is offline   POE Icon

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Posted 21 April 2015 - 11:31 AM

View PostYamanube, on 21 April 2015 - 11:09 AM, said:

Having a crankcase full of oil is probably one of the better problems to have, is the bike still oil injected?


You thinking the injector could have stuck open and drained down through the cylinder to fill the case? I don't know how zuma's are designed so it might not be possible. But i'm subscribed to hopefully learn something.
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#9 User is offline   Yamanube Icon

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Posted 21 April 2015 - 12:14 PM

I would say if it is still injected then there is probably a bad seal somewhere between the oil tank and carb (in the pump?) I am not super familiar with how a Zuma oil injection works but being the oil reservoir is likely higher than the carb, a failed pump diaphragm could allow oil to flow through and fill the engine. If it is not oil injected than there is likely a similar issue with the float in the carb allowing fuel/oil to flow into the cases.
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#10 User is offline   tall guy Icon

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Posted 21 April 2015 - 03:53 PM

I will give some details in a while. I'm working on it as we speak
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#11 User is offline   tall guy Icon

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Posted 21 April 2015 - 03:54 PM

Yamanube i think is on the right track
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Posted 21 April 2015 - 03:56 PM

And yes it is oil injected
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#13 User is offline   tall guy Icon

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Posted 21 April 2015 - 03:56 PM

And yes it is oil injected
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#14 User is offline   Yamanube Icon

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Posted 22 April 2015 - 08:44 AM

Stock carb? I can't remember, is there a check valve of some sort between the pump and carb or between the tank and pump? Where are all the Zuma experts?
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#15 User is offline   Beckett Icon

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Posted 22 April 2015 - 08:46 AM

Heard you got it running. My thought was a stuck oil injector as well. This happened on my sled on time. It might be worth cleaning/rebuilding the injector... you'd hate for it to do the opposite and not put enough in. :/
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