[krimp]

As you can see in the picture, I have an oil leak. I have ordered all of the replacement gaskets I think I might need, but am looking for your input as to what else may be causing the issue.

[longstrokeclassic]

definitely a gasket and not the rocker cover bolt seal ? 

[decker]

Easy once you remove the seat and the tank. You can catch the video from Singh?  Re: tank removal. The gas line is easiest to remove if you heat it with a hair dryer first.
https://m.youtube.com/watch?v=DY_HxjOcwf8

https://m.youtube.com/watch?v=m1mn2JVPmac

[GSS]

Start by ensuring that the header cover bolts are tightened to specs.....that might be all you need.

GSS

[Narada]

Maybe I'm paranoid, but using a hair dryer on a fuel line or anywhere near a source of gasoline makes me nervous.  Please be very careful.

[Arizoni]

Just something to keep in mind:

If a hair dryer is being used, there's not much chance of it causing any harm to the hose or the fuel pump outlet.
Hair dryers are also too cool to cause a problem with the fuel.

Now, a "Heat Gun" that's made for removing paint and such is a whole different matter.

Set on high, a heat gun can melt paint, rubber hoses and probably plastic fuel pump outlets.
Even on the low setting, a heat gun is still far hotter than a hair dryer.

[Narada]

"Caution and care make accident rare". 
From a Himalayan road sign in an RE video.

Just sayin'.

You wouldn't want your epitaph to read "Here lies arizoni, he blowed up real good"!

[Desi Bike]

I'm thinking it's the exhaust valve cover seal donut by the leak trail. Might just need tightening.  If not they are very affordable and easy to replace.

[Kevin Mahoney]

While not common we have seen leaks from both the orings under the bolts that attach the rocker box covers and the gaskets that seal the rocker boxes. As mentioned by Desi Bike it might be worth trying to tighten them.

[Arizoni]

Just a word of caution before folks start tightening the rocker arm cover bolts.

These bolts are shoulder bolts.  The body of them tightens firmly against the part with the screw threads in it (the cylinder head).

After these bolts are tightened to the recommended 1 kg-m (7.23 lb/ft) torque, further tightening will not make the cover and seal plate fit more tightly together.
It will only increase the tightness between the bolt and the cylinder head with the possibility of stripping out the threads in the cylinder head.

Because there is a lot of tolerance from the sealing surface on the cylinder head to the sealing surface on the rocker cover, I recommend coating both surfaces of the seal plate (gasket) with some oil resistant gasket maker like Permatex Ultra Black.
Also, apply the sealer around both sides of the rubber washers that go between the screw heads and the rocker arm covers.

[singhg5]

Rocker cover has step-screws as shown by a nice picture by our Forum member DesiBike on his bike when he replaced the gasket (below). These screws have only limited travel - only up to the height of threads on the screw. Once tightened to that distance, the screws cannot be tightened further and the gasket is not compressed any further. The only solution is to replace the gasket.

May be the screws are slightly loose, but I doubt that that is the real reason for the slight oil leak that you see.

As pointed out be Portisheadric, some oil may be going past the O-rings seals on the screw heads. Worth looking into them as well.

I think there are quite a few bikes with that type of oil leak. My G5 also has a little oily stuff coming out from time to time. Sometimes I clean it but for the most part I ignore it. This reminds me why it is REally a Royal Oil-Field - it is still a 1950's bike ! 

PS - Arizoni you just beat me to it, we were both typing the same thing at the same time  !

[Kevin Mahoney]

Very good points!

[decker]

Just did this procedure on my G5, which is why I was able to post both videos showing the tank removal ( thanks Singhg5) and the rocker cover removal. In the process I found slight defects in the metal finishing under the gasket where the leaks were originating. I used good quality gasket seal both sides of the seal. No problems with anymore leaks so far.

[longstrokeclassic]

My 2009 865 EFI Triumph Bonneville also used shoulder bolts to secure the cover, but those bolts screwed directly into line bored camshaft caps     
Definitely something you don't want to strip.

[Carlsberg Wordsworth]

I replaced just the washer on mine. I bought a full set just in case but not needed.

At the time, I wondered if any polishing of the rocker cover had caused the rubber to perish faster.

'twas a simple fix, easier with tank off.