Topic: New plugs, caps, cleaned carbs, spark on all 4, one cylinder still down.

[Buttmask]

Got myself a '75 750F.

The last couple weeks any time I would gun my bike hard, cylinder #2 would go out, let it sit overnight, magically it started working again.

My carbs were cleaned 3 weeks ago. And it hopes of fixing this I installed all new NGK plug cap's and threw some denso plugs in. I have spark on all cylinders but number 2 is not firing.

Any theories?

[Stev-o]

I have spark on all cylinders but number 2 is not firing.

Have spark but no fire?  HUH??

Run it for 2 min, is #2 head pipe hot?

[Buttmask]

Correct, not hot on #2, at any point of running time.

[Buttmask]

Problem solved I think, carb bowl empty, looks like I have a sticky float valve.

[JDS]

Had the same problem a couple of weeks ago.  There was some crud in the T blocking fuel going to that carb.