First thing is to iron out the niggles, it's let me down 3 times out of 5 this last week. Starts fine then drops to one pot only. Last night I rewired from pickups to ignition boxes (motoplat) I'll know in about 10 mins if it worked
Hahahahaa!
Sorry - i only laugh coz i got a Guzzi that does that. Has done that, ever since i got the effing thing.... 15 years and 60k miles ago!

I pull the HT cap away from the plug - it works. I put it back - it conks out.
I've never figured it out.

It's had motoplat (which i'm told is a good idea to get shot of anyhow

)
Lucas Rita - still have that - you can borrow it if it helps to diagnose?
Now has Dyna ignition. Which along with the VW Beetle coils gives a lovely spark....
.... but now and again (e.g. this morning as i'm leaving for work of course

) it goes on one cylinder for no obvious reason.
I just either pull the HT cap away for a few minutes / or cope with a 500c.c. single

- it goes back onto 2 cylinders after a few minutes.

Only thing i've found that has reduced the problem a LOT is to switch ignition on a couple of minutes before i actually want to start the engine.
I am told it helps the rotor / stator magnetise. (But as i'm a total electrophobe - this could be me talking bollox

: )