Question about Yamaha YZ 426 F Motorcycles

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About half way up the engine there is a hole i am told for drainage from the spark plug in case water gets in there which is fine only that there is oil that is spiting out of it when you rev the motor. When at idle there is small amouts that spit out tho not as much as when i rev the motor

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The recess that the spark plug goes in,is quite deep.In order to get any water etc. out,that drainage hole has been put in.Its good that its not blocked.The oil coming out can only come from the valve cover,on top of the motor.Its only the gasket that is leaking.It needs to be lifted,cleaned and reinstalled.As you rev the motor,more oil is pumped around the motor creating extra oil coming out that hole.With the tank off,look down beside the spark plug and you will see it will have the oil in the sparkplug recess.The hole is in no way connected to the inside off the motor.It is purely a drainage hole for the s/plug recess.Hope this helps

Posted on Sep 12, 2009


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