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MSU 700 Oil Burning

Chile

By Chile
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Chile Newbie

Chile

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2018 Massimo 700 MSU. The machine started burning oil all of a sudden. One day fine-- next morning burning oil. Looking for advice. Do I pull the engine to inspect the top end or can it be done with the engine in place? Pro? Cons?

Any and all assistance is greatly appreciated in advance.

Chile

 

Joe Breaux Mentor

Joe Breaux

Posted
Posted

You can tear top end off in frame but before you do all that, do a compression rest and leak down test to see if it's rings or piston damage or valve issues..what oil are you using?  Too low viscosity will. Let oil get by. Crankcase pressure will too.. what does you oil look like? Black...milky? Clear?  Unless you just want to refresh it. Find out why it's burning oil before you start wrenching.

Chile Newbie

Chile

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Thamk you Joe for your response.  We were out of touch for several days. Back home now. 

I will do a compression test this PM. This machine has about 350 hrs. on it. Oil burning issue occured literally overnight. Really strange. Post compression test I will do a leak down test. I've run many compression tests on 4 and 2 strokes. Never a leak down test as basic comp test always indicated issue/no issue.

Does the HISUN engine compression relief mechanism interfere with performing a basic compression test?

I have avoided the extra 1 1/2 qts of oil experiment after observing my neighbor's results with this experiment on his Polaris. His wasn't so much an oil consumption issue as a beer consumption issue. However, he does have a very refreshed motor and his motor was tired with way more than my 350 hrs.

I'm running 15W40 here in the deserts of New Mexico. We do use the unit in Colorado during the summers however. I can't imagine that 15W40 may be too heavy for 70 degree days in Colorado but I am no expert in that regard either. 

Your mentioning crankase ventilation is interesting as the machine only smokes off idle usually under load. Zero visual smoke at idle or below approx 2200RPM or so.  I will chase that aspect down as well.

Thank you again for your assistance with this.

Chile

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