Check your spark units in back under seat. there is 2 of them. swap them and see if cyl 2 and 3 fire and 1 and 4 dont. Similar thing happened to me and it was spark unit. If thats the case for you PM me I have 2 extra
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter