1977 GS340 Spark Issue

hi everyone, so i just brought my dads old 1977 gs340 home after sitting for 15-20 years. he rebuilt the motor before putting away due to someone running the oil injector reserve dry (pro tip: dont leave your keys in your sled) so ive encountered a very weird problem i am unable to find a solution for. so there are two coil packs with the plug leads, orange and white, one for each cyl. when hooked up normally only the orange sides plug will spark, when switching the wire that supplies the pack with power, the white one will fire. i cant for the life of me get both of them to. ive checked continuity in the whole wire harness and its all good. so i have it stripped to the magneto and am at a loss. anyone?

thanks so much

1977 GS340 Spark Issue