Annoying wee oil leak

[johnnyalpha]

Hi Folks, FJ1200 3XW 1991, 30K miles.  I replaced the valve cover rubber gasket and the wee rubber grommets recently. They had gone all plasticky and were leaking. However,still have a wee "blue haze" if sitting at lights too long. On the RHS of the bike at the front,as you sit on it. Retightened the cover bolts, VERY GENTLY, they were OK and no sign of any leakage anyway. Now I suspect the o ring on the wee cross headed bolt/screw on the RHS high up on the engine may be weeping, Two questions, what is this bolt/screw ? and does anyone know the part number OR the dimensions of the wee O ring ?
Cheers Folks Ride Safe. Johnny (Edinburgh,Scotland)

[andyb]

http://www.boats.net/parts/search/Yamaha/Motorcycle/1991/FJ1200B/parts.html

Start there and find it.  If nothing else, figure out which diagram it's on and a number, and someone will likely know what it is, does, and whyfore it makes with the pissing.

Note: The cam cover bolts (the ones that hold the valve cover on that go through the rubber grommets atop the motor) are shouldered.  Too tight is a damned easy point to reach on them, and you don't want to be finding where it is.  The rubber should make a seal before the bolt bottoms (though you bottom it anyhow in the process of putting correct torque against it).  Just be cautious there.

[racerrad8]

That is a 6mm bolt used to block the oil galley in the head.

It requires a copper washer, no rubber can live with the heat there.

Randy - RPM

[johnnyalpha]

 Hi Folks, thanks for the input.
Oh yes I am well aware of the woe that can ensue from mullering these valve cover bolts down to enthusiastically, I go very ,very carefully

Hi Randy, so this is an oil gallery drain bolt, mmmhh odd, I undid this and there was no gouting of oil, a wee weep, but no flood.
There was the remains of a rubber or rubber type o ring in place, I say remains cos it was well knackered. I put some Hi Temp RTV in place and carefully
re installed the bolt,didn't overtighten, (see above), and let her sit overnight. That seems to have stopped the weep, at least for the moment. No sign I could see of a copper washer, so perhaps
I am seeing the handiwork of a previous owner. Do you know the dimensions of this copper washer ?  I suspect that, as you say, the RTV may not survive long in the heat of that environment and my weeping shall resume !

Ride Safe all, Johnny (Edinburgh,Scotland)

[johnnyalpha]

Hi Folks, me again
OK looking at this microfiche, thanks for the link
I think I am talking about items 4 & 5 ?, http://www.boats.net/parts/search/Yamaha/Motorcycle/1991/FJ1200B/CYLINDER%20HEAD/parts.html

Both unobtainable

MMmhhh

[red]

Hi Folks, me again
OK looking at this microfiche, thanks for the link I think I am talking about items 4 & 5 ?,
http://www.boats.net/parts/search/Yamaha/Motorcycle/1991/FJ1200B/CYLINDER%20HEAD/parts.html
Both unobtainable
MMmhhh

Johnnyalpha,
Never say die!     Yamaha makes lots of toys, and it's fairly common to find that another Yamaha gadget uses the part that you need.  Now, superseded parts may not always have a good replacement, but it's usually a fair bet that they did get it right.

Do a Google Search for
Yamaha "Part Number"
with the quotes, and you will find out who has one (or thinks that they do).  I can't vouch for web pages that I have not used, so the Search will need your persistence.  Call to verify the stock that they claim to have.  In this case, Search for:
Yamaha "90153-06045-00"

Dogpile.com is pretty good for finding out-of-the-way places to get odd parts.  Google does not list every available source.

Anyway, here is a start for you:

The screw has a superseded Part Number.
90153-06045-00 old
90163-06002-00 new
http://www.partsoutlaw.com/oemparts/a/yam/5003aac3f8700212fc83abdc/air-shroud-starter-2

The gasket is readily available; I'm not sure why your first site said otherwise:
http://www.2wheelpros.com/oem-parts/yamaha-gasket-90430-06014-00-part.html
http://www.motosport.com/dirtbike/oem-parts/YAMAHA/2012/YZ250F/CYLINDER

Cheers
Red

[FJ_Hooligan]

... so this is an oil gallery drain bolt, mmmhh odd, I undid this and there was no gouting of oil, a wee weep, but no flood....

Technically, it's an oil bleed port.  After rebuilding an engine which would have no oil in the galley to the top end.  You would open these ports while cranking the engine over.  Once oil reaches these ports, you've primed the system enough to safely fire the engine without risk of top end damage from oil starvation.

[red]

... so this is an oil gallery drain bolt, mmmhh odd, I undid this and there was no gouting of oil, a wee weep, but no flood....

Technically, it's an oil bleed port.  After rebuilding an engine which would have no oil in the galley to the top end.  You would open these ports while cranking the engine over.  Once oil reaches these ports, you've primed the system enough to safely fire the engine without risk of top end damage from oil starvation.

FJ_Hooligan,

So, since this oil port has been opened to the air, should he prime the system to that point, before firing the engine again?

Thanks,
Red

[ribbert]

... so this is an oil gallery drain bolt, mmmhh odd, I undid this and there was no gouting of oil, a wee weep, but no flood....

Technically, it's an oil bleed port.  After rebuilding an engine which would have no oil in the galley to the top end.  You would open these ports while cranking the engine over.  Once oil reaches these ports, you've primed the system enough to safely fire the engine without risk of top end damage from oil starvation.

FJ_Hooligan,

So, since this oil port has been opened to the air, should he prime the system to that point, before firing the engine again?

Thanks,
Red

No, not necessary.

Noel

[FJ_Hooligan]

No, not necessary.

I guess not, crank it up and bang it off the rev limiter!

[johnnyalpha]

Aha !!!  thanks folks, I'll follow up that leads, Ride Safe All Johnny

[ribbert]

No, not necessary.

I guess not, crank it up and bang it off the rev limiter!

Well, you could do that, but I wouldn't recommend it.

Noel

[ribbert]

No, not necessary.

I guess not, crank it up and bang it off the rev limiter!

Well, you could do that, but I wouldn't recommend it.

Noel

There are reasons why this is not necessary and I don't understand on what grounds you disagree but if you don't believe me, ask Randy.

Noel

[FJ_Hooligan]

I wasn't disagreeing, I was conceding.

I thought I read about bleeding the top end oil system through that bolt but I can't find any reference to it so nevermind.