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Author Topic:   yamaha blowing heavy oil 7 smoke
k2 posted 10-07-2003 07:37 PM ET (US)   Profile for k2   Send Email to k2  
my 1989 70 yamaha is actually pouring out a puddle of oil thru the exhaust .i imagine it is the oil pump. maybe the diaphram or what about the check valve?

has anyone experienced this problem and what did you do to rectify it? i will probably switch to premix if it is the pump.


Bigshot posted 10-08-2003 11:55 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Get a manual but I doubt the pump. It could just be out of adjustment or choke is too rich, etc.
k2 posted 10-08-2003 07:12 PM ET (US)     Profile for k2  Send Email to k2     
thanks bigshot .i do have a haynes manual but i didnt see anything about too much oil, just too little.

maybe i will run it without the oil pump and see if she runs ok.
i believe if you remove the pump gear and seal the hole with an aluminum plate, plus plug the hoses it should be ok to run with 50.1 premix.

i was wondering if i just sandwitched the plate between the pump and the motor if i would still have to seal of all those oil lines?

k2 posted 10-08-2003 07:27 PM ET (US)     Profile for k2  Send Email to k2     
forgot .i just had it serviced where it ran well although it did blow a little smoke at low rpm. the mechanic said then he thought the pump may be comming a little bit of a problem.
triblet posted 10-08-2003 07:35 PM ET (US)     Profile for triblet  Send Email to triblet     
A Haynes manual for an outboard? That would be a truely
wonderful thing, but there's no listing of these on the
Haynes website.


k2 posted 10-08-2003 09:06 PM ET (US)     Profile for k2  Send Email to k2     
Triblets right .it's a Clymer. i need a manual to keep track of my manuals.

Talked to a mechanic who thought that because the oil was black and coming thru the prop area that the fuel pump diaphragm had blown and gas was mixing in with the oil and washing the cylinders. i took the pump apart and the diaphragm looks good to me... a shame because this would have been a real easy fix.
so back to the drawing boards.
i won't take the oil pump off though because i think bigshot is right. it probably is something beside the oil's just that the whole shebang was just tuned and this is the first time i tried to run it.
the reason i dont take it to an ob mechanic again is there are none anywhere near where i live and the nearest are booked up for weeks.

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