Carb "Farts" on #1 cylinder

[dardoonk]

Number one cylinder "farts" intermittently. Technically, I suppose it is a backfire, not flame source present. Since I run only velocity stacks, I can actually see a fuel mist exit the carb. Only #1 cyl does it, so I do not think it is ignition related. Typically it does it at idle and sometimes when snapping throttle shut

Shortly after, I get a backfire in the exhaust. Any thoughts??

> Tight intake valve?
> Just a carb problem?
> Could it be anything else before I tear the top apart?

77 GS750 /4-1 / 29 smoothbores (freshly built) with velocity stacks / new O-rings, boots, fuel filter, etc... that is all new.

jetting: 20 pilots/ 122.5 mains/ +/- 1 turn on fuel screw with std 29 needle in middle position.

[TheCafeKid]

Too rich on one of the circuits...likely the pilot..but could be because of some crap that got in em thru those velocity stacks...

[dardoonk]

Well, that's better than a tight valve. and a heck of a lot easier fix.

I like my Velocity stacks !!!! Plus, I gave this motor an End of Life date of Dec 15, 2009...

[hikermikem]

Plus, I gave this motor an End of Life date of Dec 15, 2009...

How does one establish this date??

[dardoonk]

It's a soft date... I am currently restoring a GPZ1100 and should it finished and I'll be in the midst of building an 8V 1100 for 'zuk. I figure, by 12/15, the current motor will have seen its final ride.