Thanks Julian,
The vinegar treatment got a lot of gunk out of the tank (it hadn’t been used for a while) and got me going but it will definitely need treatment going forward so many thanks for the tip- i will check out the youtube vids!
Have been running through my list of jobs and now have the 150 running and had a couple of short (5-10 mile) trips out (between the showers) to see how things go- the carb needs some sorting and i now have a small drip of gearbox oil; i suspect the level check screw should have a aluminium washer behind it?
Thanks again,
John