From the way the engine is running, I don't doubt that the timing is far off. However, she had the clutch fettled by BMW 30 years ago and they put the flywheel in the wrong spot. The PO has never touched the timing as evidenced by the totally unmarked fixings on the electronic ignition bean can.
This also means the mechanical advance hasn't see the light of day for 30 years either.
I've timed up several home-brew model aircraft petrol engine conversions so have a degree wheel and a plug stop. I've read Snowbums thread on this and it sounds good. Get to close to TDC, put stop in, find where it is, rotate the other way and set the degree wheel (bendy wire) stuck to the front of the alternator.
Then I'll put a paint mark on the flywheel through the bung hole for TDC and the same for 6 degrees. Ancient Gunson timing light then gets a go and we see what flickers where.
Question is, with 650 flywheel and 860 pistons (800 for cash) what sort of range of flicker can I expect? :-?
I have no noise from the engine or gearbox when cold and just a little thunk-thunk clutch out and a bit less clutch in when hot. I've not balanced the 850 kit yet and will do that after a few miles. If the ignition is bouncing around though, I'd rather know.