a buddy brought over a 1400 suzuki intruder that runs a while then stalls out other times it won't start. seams to be getting spark so i thought maybe fuel. spun over and sprayed some gas in rear air box and rear cyl fired up checked pump and that seams to be working, also carbs seam to be getting gas cause i get gas out of bowls when i drain. are their any other things to check for........thanks.