Yamaha F90 mechanical question..?

[Pigeontroller]

So I just changed the plugs on my 2005 F90, about 950 hours on it. I noticed the bottom plug (its an in-line 4 cyl) had some oil on the threads, where the other 3 didn't. Then I notice what seems like a wee bit of oil in the plug hole?

 

Opinions?

[chris.brock]

I'm definately not an expert, but if it doesn't burn much oil, I wouldn't worry about it, it makes sense the lower cylinder might be bathing in oil a little more than the others, and hey, it's a Yamaha, they are typically reliable

[Dara]

I know nothing...run it for a while and look again.

It could have something to do with sitting all winter

Edited May 15, 2012 by Dara

[Pigeontroller]

Sitting all winter? I've been running it since early march!

[Tybo]

Is the engine crank case losing oil or making oil.making oil is fuel getting into the crank case.

Is your oil black and have a smell of fuel.

[brkygetr]

Also not an expert but the lower cylindar(3) in my 97' 2 stroke 40 has the same issue. Always has and as I understand it always will, as stated above oil falls down to the bottom..I just clean my plug and drain the bowl every now and again...works just fine.

[NANUK]

How much oil was on that plug ? It's normal for the bottom plug to be a little "wet" and having a bit of carbon compare to the other 3,

Like mentioned by others, keep an eye on oil level and NEVER over fill, in fact it is better to keep it slightly lower then the full mark on the dipstick.

[F7Firecat]

the yammie is junk, scrap it and buy verado!

[Billy Bob]

Me thinks your fine.....go fishing.

[bucktail]

Maybe you get a bit of oil from when its tilted full up. I have the exact motor and havnt seen that, but then again I havnt looked. Ill check this week and post it.

 

Darren

[BITEME]

dont sweat it its all good

fish man fish!!!!

 

Biteme

[Dara]

the yammie is junk, scrap it and buy verado!

 

 

says the guy with the catscrap

[Pigeontroller]

Thanks for the feedback guys...And Brian, just talked to a very reputable dealer in Hamilton, he won't even sell them Verados cause...Well, he did say the newer ones aren't as bad as the older ones...Bet you a St.Croix LTM my Yammie lives longer?

[F7Firecat]

LOL guess we will see...........

[irishfield]

LOL guess we will see...........

 

Going into season 6 with my 275.. never a hickup !

[chris.brock]

Yamaha's the best

to heck with the rest!

 

2 sleds, 2 outboards and 1 really geeky Yamaha scooter, I'm happy with them all

Edited May 17, 2012 by aplumma
no mock cussing please

[F7Firecat]

Yamaha's the best

to heck with the rest!

 

2 sleds, 2 outboards and 1 really geeky Yamaha scooter, I'm happy with them all

 

How many times have you had to weld the the skid and replace the sliders on that yammie?

[workwear]

hey firecat...what are ya 12 yrs old??

[ecmilley]

for the op- if your seeing oil on a sparkplug threadds and the spark plug itself depending on the design of the engine it could be spark plug tube seals no biggie but havn't been under the cowl of a yam for several years if you fire a pic up of the spark plug area may get a better idea

[ecmilley]

How many times have you had to weld the the skid and replace the sliders on that yammie?

now now i replace sliders in my yammy about as often as you replace pistons and rings in the fireball.

only welded my skid once in 13000 km of ditchbanging and trail riding not the strongest skid i know but rides nice

[F7Firecat]

just a little bit of razzin workwear, how old are you or shall i guess?