As we have previously discussed John, when I used to run model 4 stroke ic engines, I used to use the late Bob Shores method of top end and piston lubrication, and my engines really liked the mix.
Just to let everyone know the magic formula, it was a 10% mix for running the engine in (2 tankfuls) and a 5% addition for running after that. Oh!, and the magic ingredient, WD40.
Make sure you give it a shake before use. I personally would only mix up enough for a couple of runs, I never liked mixing up full batches because normal pump gas has a tendency to go stale and not work if left for a while, but your Aspen fuel doesn't seem to matter how old it is, it will still run OK.
Now one thing I have a worry over.
This mix works great for standard carbs, as it is being physically atomised just before entry into the cylinder. I don't know if the WD40 trick would work in a Vapour Carb, it just might not get atomised with the vapour and just be left as a residue at the bottom of the tank. That would be one thing that needs trying out.
Other than that issue, the Aspen gas really looks to be the one to go for in the UK, and when I start into ic again (in the not too distant future), I for one will be using it.
Thanks for the link John
John