more hard start troubleshooting ( sorry this got a little bit wordy )
1. the transistor box needs a certain minimum voltage to maintain timing . ( somewhere around 10 volts )
low voltage at the white wire into the transistor box ?
(the output to the coils is normally off , so you can only check for consistent voltage at the input)
12.7 volts at the battery
... should be very close to 12.7 volts delivered to the transistor box .
"shade tree" test the battery
capacity with the headlight ... will it light the headlight for 5 minutes ?
if the light dims quickly ... the battery
capacity is suspect . .. with a voltmeter you can watch for voltage drop at the same time .
2. sometimes it not low voltage , but low amperage ,.. this is a power connection
some part of some wiring is compromised
( aka bad connection ... frayed wire )
the test is , to see if the same white wire , at the transistor box ... will light a 12 v incandescent filament .
a standard brake light/ tail light bulb is about the right wattage .
Jumper in the larger brake light filament ...
filament glowing brightly indicates adequate Amperage and voltage to run the ignition box and coil .
3. It's fairly easy to hook the 2 Leads from the stator to transistor box backwards
( confirm these connections , or switch them around .)
4 . 250 singles can be harder to start . There's only one spark opportunity every 720° of crank rotation .
the same ignition on a 500 twin would have twice the start opportunities ... one every 360°
the transistor box goes into standby after 2 seconds ... making it slightly harder to start the bike
because a small part of your kick is wasted in waking up the box .
tickle the carb and whatever the rest of your start drill is ... before turning on the ignition .
you have about 2 seconds to kick , and 2 seconds between kicks before the box goes into standby .
( turn the box off if you must take a break from kicking to remove your jacket and wipe your brow )
... its a silly little start procedure , turning on and off in ignition , it may not be necessary ... but can be helpful
Starting a recalcitrant single with electronic ignition .