The way my luck runs, my son reckons I must have broken lots of mirrors ...
As it'd stopped raining for a day, was going to give the big vee a run on Sunday. Except I couldn't start it.
It has to be decompressed to start (starter can't manage on full compression) but even so I only get 10 - 15 seconds before a fully-charged battery is down. It's a 200A jobbie (actually, seem to remember it's 230) but now 2yrs old - about the age for these expensive batteries so expect it's time for another.
Being coil ignition doesn't help either. It has the usual 12V system (6V coils with ballast resistors) but hitting the starter will drop a battery to around 9V, meaning my coils are probably getting around 4V during starting. Or even less with a tired battery.
Some vehicles in the 60's (eg Vauxhall) employed a tiny disc ballast resistor (a type I use) and bypassed it with a 12V feed to the coil from the starter circuit. That way, your 6V coils got 9V during starting.
When building the bike, I put the wiring in for such a set-up, but never completed it. Time for the seat off and get that bypass in place. Must move the starter button as well. It's currently central by the headstock, but with having to decompress simultaneously and only having two hands, can't give the bike a whiff of throttle it sometimes needs on starting. Usually it starts fine with just choke, but the cold weather and failing battery don't help.