what is the best way to clean the jets on the carb?

are you still running the  stock 20R  carb??  if so  your fuel cut solenoid  is not getting 12 volts

you can run a jumper  wire  to it  and  try  to start it  to find out


you should think about a bigger carb,  like the stock 22R carb =320cfm  the stock 20R carb is only 190cfm