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Ask how many guys have said that...and then looked back when they're done, and realized they spent $1K or more than what they...ahem...expected 

It happens to the best of us! Haha

I think it's you that has Millennium Technologies on your doorstep?
Do you know happen to know anywhere in CA you would personally recommend for this type of work?
I've read about Tom Morgan but don't know if he's still located in CA.
 I could probably get the bike and me to the border in a truck, that's why!  

No, Millennium Tech is back east, I am in Oregon.
However, I send stuff there all the time.
Tom Morgan runs Millenium's machine shop  

I'm sure there are some shops there but I don't know any personally.


Jason Tanner builds all my engines.
He works out of my shop.
He also builds bikes for many customers around the world.
He is currently building The pumpkin seeds engine which has many new modifications never before seen on a KX500 (That's all top secret stuff ) This bike will be featured in Motocross Action Magazine.
He is building Pro Surfer Sonny Garcia's bike which will be featured in Racer X magazine.
He is also building a Land Speed KX500 bike... again.. Top Secret..
Contact him at 541-653-5334

Oakland track map...

https://racerxonline.com/2019/01/22/oakland-animated-track-map

You should be able to get everything you need rather easily...some OEM, and aftermarket parts are readily available.

Thanks for all your help guys, use are legends, as use recommended I know it would be a good idea to tear it apart and rebuilt bottom end seals and bearings, but as I’m only a beginner in this I think that is something that I would have to get a moto mechanic to do, witch come down to price. Are the parts for a bike this old easily acceable for parts. 🤙

A leak down test can help determine if you have a bad crank seal.....but you'll need to fix that head gasket issue first.
The head could very well be warped also...you'll need to make sure it's flat by lapping it on a very flat surface.
Same with the cylinder....remove the studs, and lapp the deck surface too.

I know this is not what you were asking, but I agree with Foxx.  If you rebuild it without splitting the cases and checking the bottom end, bearings, and seals, you will be wasting your money.  Your bike is 20 years old, and unless the bottom end was redone recently it's most likely both worn out and now rusty. Even if you buy a simple Wrench Rabbit kit and rebuilt it, you would be miles ahead of trying to flush out the bottom end.

If it were mine and I was going to keep it, I would go through it and replace the bearings, seals, and transmission snap rings with OEM parts and the gaskets with OEM or Cometic.  I'd also replace the rod and piston with Wossner parts.

All the fasteners, axles, and pivot pin.
I can't say more than that right now but more will be revealed in time..

Lol... Because compared to the whole pumpkin, the seeds are about the only thing left from the original bike... Or something dumb like that  
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Like I say, look forward to seeing it particularly as it'll be road going.
I found this online, personally I'm not adverse to it at all. I mean the idea, I'm not into the bling bling thing. Would've put spoked alloy wheels on it.

Btw, you know I mentioned shipping my bike to the states to get it done, and you said "Just do it!" - well actually, it's not such a crazy, or even a bad idea. I'm in a position to do nothing here, have no tools or facilities etc., so should just send the whole bike including engine to be blueprinted/rebuilt in the US. That business about riding it once I'm there, either back here, or to a place to ship it to the UK, is no joke either, she's plated and registered in my name, just need lights etc.
I've had a glance at your site but not yet had a chance to look at it properly. Do you carry out any work yourself? I think it's you that has Millennium Technologies on your doorstep?
Do you know happen to know anywhere in CA you would personally recommend for this type of work? I've read about Tom Morgan but don't know if he's still located in CA. I could probably get the bike and me to the border in a truck, that's why!  

I don't want to go nuts. But we will see!

Ask how many guys have said that...and then looked back when they're done, and realized they spent $1K or more than what they...ahem...expected 

The only problem with just turnin it upside down and flushing it, is you won't have any idea if there's any rust damage(most likely there is), and no one knows how long water has been in there.
Unfortunately, the best way is to tear it down....unless of course, you don't have any intentions on it being a truly reliable bike. I don't mean that in a negative way...but if you're gunna do a rebuild on it, don't skimp...or you'll be tearin it apart again, sooner rather than later.