Yamaha 9.9 4T oil consuption

sime

Cadet
Joined
Nov 4, 2016
Messages
7
Hi,

I bought may used boat 5 months ago. I got yamaha 9,9 4T 2004g with them. I notice abnormal oil consuption. In cca 10h it spent 0.5L of oil. I think that it is not normal oil consuption. In smoke I can smell a little bit of burnt oil. Is it problem of piston ringd or oil seal on valves? Other things is perfect on engine except that oil consuption.
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
8,851
oil rings and valve seals are something that a 4 stroke motor could have problems with for burning oil.

make sure it is not leaking out somewhere also
 

sime

Cadet
Joined
Nov 4, 2016
Messages
7
I know that,. How I can know is oil rings or valve seals reason for oil consumption. Or the best is change both of them.
 

sime

Cadet
Joined
Nov 4, 2016
Messages
7
I open yellow plug for oil on cylinder head. I can feel some presuure on hole. I know that is normal on one cylinder 4 stroke engine. On cars four cylinder engine that is not normal. How is it on two cylinder 4 stroke engine?
 
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