Simon
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It could be a few things one I would check is the o2 sensor also the comet is really prone to bad connections which is something you need to go through first, the ics is another thing but I can’t state enough clean the connections I mean all you can find
You can splice the wires no problem, tbh on my old bikes I hard wire them anyway cuts out any internal loom problems
The ignition timing is fixed by the ECU, the marks you refer to are for top dead center so providing your not touching valves etc you don’t need to worry about it.
It will be a damaged valve with the head off turn it upside down & put some alcohol or petrol in it you will see where it’s running out of
It seems like the front cylinder has some damage so head off to investigate further I’m afraid
The problem is where the primary circuit (idle) of the carbs are progressing to the secondary (mains) it’s being starved of fuel could be dirty jets or setting etc
I’m not sure what efi version you have, it could be a problem with ICS solenoid or if it has it fitted it could be a problem with the throttle position sensor
If it’s skipped the cam there’s a chance it could have damaged the valves so compression test is the first thing
It sounds like when the original rectifier failed it let the full voltage hit the wiring which has burnt somewhere & shorted everything to ground, a normal stator/rectifier fault won’t smoke the dash etc
Sorry for the late reply I believe they are 10 mm you can little sets of assorted sizes or just the 10mm on their own from the likes of ebay
It could be worth checking the air intake sensor as it could be reading to lower temperature and causing prolonged injector timing
There’s no adjustment on the efi it’s controlled by the ECU, it could be a dirty injector or air filter there is also a chance the O2 sensor is playing up but that only comes into play at certain times, try putting some injector cleaner in.
