I know this might sound crazy, but hold the start button in and slowly move the kill switch back and forth. I just had to replace my right hand switch assembly because the kill switch had gone bad and was doing what yours appears to be doing.
2004 GL1800 Bloodstone Red Metallic
1988 GL1500/6 Martini Beige Metallic (Sold)
1984 GL1200 Pearl Saturn Red/Century Brown Metallic (Sold)
1981 Honda CM400T Candy Sword Blue with Metallic Light Blue (Cubed and Recycled)
Homo praesumitur bonus donec probetur malus