Sorry to state the obvious but you are checkng the sight glass with the bike 100% upright?

 

Yeah mate lol, I had it on the same stand under the same place on the engine every time. Also had it stood with wheels on ground resting against workbench.
Last time out I turned fuel off pretty much everytime I didn't have the engine running incase it was still coming thru the carb somehow

 

Now that the oil has risen to the top line, you could drain the oil steadily to the lower one now the engine is cold? And see if it stays steady, although I'm pretty sure it should be at the lower when cold and rise to the top line when hot.

 

Although you say you pre soaked your oil filters first, I never used to to that and was always fine, I just replaced filters top up oil as normal, run bike and check level once cool for a top up....

 

x2

 

Is your radiator cooling fluid level ok?

 

Surely pre soaking the filters won't make a difference ? I left the bike overnight before setting the level so any oil will have ran back into the bottom of engine and the last oil change I never touched the filters.
Have checked the water level before every ride and it's never used a drop, level is just above the top of the core, in my mind it's getting petrol in the oil but I can't work out how, not been in any deep water to get any in that way if it was possible

 

If your getting petrol in your oil it will STINK of it (not just a slight wiff) is this the case wen you drain the oil out? Also is the oil milky?

 

Sounds to me like the pre soaking is accounting for the extra oil. Mine always seems to show as higher in the window if I pre soak them first. Just when topping up dont add as much oil as the initial oil it absorbs will be less.

 

Just re-read your post, temperature will affect the thickness of the oil so if checking it a few days later when cold it will be thicker. Sounds unusual for fuel to be getting into the oil...

Is the oil a normal colour when dropped?

 

The oil did smell of fuel pretty strongly after I dropped it out before my last ride. I can't work out how it's getting in there if it's petrol?
I left the bike overnight both times to let it settle and any residual heat in the engine to disperse.
The oil was pretty grey when it came out even after just the 5 hour run, was lovely bright putoline when it went in

 

Is your breather hose(s) that hang down at the bottom of the bike blocked?
This seams a long shot but if the float bowl breather is blocked then fuel won't have anywhere (safe) to flow. So I may be flowing into the 'crank case' breather' instead?

The crank case breather is the one that connects to the air box/carb boot and the front right hand side of the engine case.

Just another angle o check for no cost.....

 

Will check all the breathers tonight Scott, never thought of checking those to be honest, I've had the bike a year and done probably 6/7 oil changes in that time and it's always been ok.

 

No worries let us no how you get on mate.

 

Or you may have cured the worlds oil crisis

 

Haha I will be rich!

 

Have you put in that new 'reproducing' oil by accident.... Can I have some?