yamaha 2001 115 efi making oil

Joined
Dec 30, 2009
Messages
1
good compression,primer bulb test on fuel pump shows no blowby on ndiaphram or plunger..could engine not be making enough rpm and getting blow by...i' almost stumped
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: yamaha 2001 115 efi making oil

compression test on that motor is about useless.
we need a leakdown test.
what is max RPM running with your normal load?
when was the last time the thermostat was checked or replaced?.
there is also a tech bulliten that covers a range of seriel numbers in about your production year model.
go by any yamaha dealer and have them run your PID.
your looking for possibly 2 tech bullitens.
one on making oil and one on the oil pump(totally seperate but have a look).
 

zzzzz

Lieutenant Junior Grade
Joined
Jan 13, 2003
Messages
1,094
Re: yamaha 2001 115 efi making oil

do you store your boat with the motor vertical or trimmed up ? :cool:
 
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