My '73 T100R Daytona sat for a year while I was involved in other projects. When I got back to it, I could not start the bike, even with a new battery. But I had spark -- the bike would fire on starter fluid but immediately die. Fuel flow into carbs appeared to be fine. I pulled off both carbs, dismantled them, and did a full cleaning, and noted that in both carbs the pilot jet was severely blocked -- took a lot of soaking in carb cleaner, plus running a #10 guitar string into the air pilot screw hole to remove the blockage (I know some advise against the latter, but it was the only way I could clear the blockage, as revealed by free flow of compressed air through the passages). While i had the carbs apart I replaced the needle jets and the float pins. Upon reassembly, I now have first-kick starting every time.
