carb blowback on nonfireing right cyl.

[motonut58]

hi all, I have a 82 xs that I bobed afew years ago and have had no problems with until now, the right cylinder is not fireing, I've adjusted the valves, I have good spark, cleaned carbs, tryed diff. Set of good carbs, at idle the right cyl. Pops now and then but the right carb is blowing the fuel out the air intake end of the carb, what do you think?, bad cam? Bad valve?, thanks for any help

 

[gggGary]

Do a compression test. My vote is the intake valve.

 

[daroberts3]

I second gggGary's vote. Intake valve not functioning properly

 

[motonut58]

thanks I'll do that