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Well, this is a new one for me; I haven't seen an OEM head modified for a removable dome before. I thought, from your first picture, that your head must be cracked! I think Mark's idea is on the money.
Who did the head mod?

I have never seen that either.  To be honest I was surprised to see that mod when I got the motor back.  I had no knowledge that was going to happen. (another story)

I agree.  I plan to use Mark's idea to fix the leak.


Garrett did the work.

Actually, these had an o-ring.  If you look closely you can see a groove around the perimeter of the machined insert.  This was first time doing this,so I may of messed something up. 

Thanks Mark.

I think the hardest part is going to be getting the boss out of the head.  The picture above is when I received it. It had somehow popped out in transit.  I was unable to get it back in and had to send it back to the guy who worked on the motor.  He put it back in.  I am assuming he did not use any sealant.  I will find out.

Anyway, thank you again.

Yep. Well, sort of.

To me, it looked like it is coming from the area where the machined piece is inserted into the head.  Not where the spark plug screws into the machined piece.  I hope that make sense.

I attached a picture of the head and how it looked before the install.

Thanks

Well, I filled the bike with coolant.  Had two leaks.  I fixed one by tightening the a hose clamp. You can see where the other leak is coming from. 

Could you veterans give me any advice on how to fix the leak?  I hoping I don't have to pull the head since I just put it on.

This is a o-ringed head and I used permatex Motoseal gasket maker-grey.

I hope the pic works

Thanks

Got the head on a couple of days ago.

 I used my finger instead of a brush like you guys recommended and it went well.

Thanks again!

I dab it on using the tip of the tube, then smear it very thin with a gloved finger.

It's way too viscous to use an acid brush, so a fingertip works well. 

Thanks.  I was going to use a brush.  Not now.  And I would of put to much.

@ Mark- Thank you for chiming in with your knowledge. I appreciate your advice.

I picked up Permatex Motoseal gasket maker-grey.

Does anyone have any tips using this?

The directions say to apply a continuous bead of Motoseal to both surfaces.  Then to smooth material with small brush and allow to set 1 minute before assembly.

I'm wondering how thin I should smooth out the Motoseal?  I'm guessing to much is better then not enough.

It is for an rz o-ringed head.

Thanks

ah, o ringed head, didn't know.   

Sorry, my mistake. I didn't provide enough info.

@pdxjim -Garret did the work on the rz motor

Thanks gentlemen!

Permatex orange sealed great on my O-ring LC head.

This is a o-ringed head too.  Based on what I have read about your LC, it was the same guy who worked on my rz motor.

Any recommendations on a good Hi temp RTV silicone instant gasket?

I will be using it in place of the stock head gasket for my rz350.

Thanks

Yes in deed. I would have definitely participated. But, I would have been the guy riding the bike, or the guy in back watching.

Congratulations Russ!

Maybe you will want to join us for the next Bikes and Coffee event at Montgomery Motors.

Sorry for the delayed response. 

Thanks Mike!
Maybe sometime this summer when I have more time.  How often do they hold this event?

Thanks again,
Russ

Thanks everyone for the congrats!

Congrats Russ! Sounds like you got a great price on it.

(The only sad part is that it's going to lose it's California registration. And once that's gone it'll never come back. )

Yes, I think it was a good deal.  I did pay the asking price.  There were a couple of guys who also wanted it.  I was surprised no one tried to pay a little more just to get it. 

Anyway, your right.  The bike will probably never make back to California.  It's going to be a Hawaiian ripper.

Thanks again everyone!

I brought home a new addition to the family.     

I know, it's not a "YAMAHA", but I am OK with that.