Topic: 750 stalling after sitting out in dew.

[bleppek]

Just getting my 78 750K in riding shape.  Took it into work yesterday and everything ran great.  I work overnights so it sat outside the office all night.  When I got done with work, I came out to find that a nice coat of dew was on the bike.  So I wiped off the seat, pulled the choke out and she started right up.  I drove for about a mile and she started to bog down and actually quit on me a couple of times.  I finally made it home and decided not to drive it in today.
Anyone have an idea on where I should start to fix this problem, or what it might be. 
I thought that it could be due to the moisture, but wouldn't that have caused problems right from when I started it up?  And yes, it did have a full tank of gas.

[Bob Wessner]

The act of riding might have allowed some condensation to get to places it shouldn't (wiring harness connections, plug wires/caps). Let it thuroughly dry out and see what happens. Just a thought.

[TwoTired]

Just a guess.
But, if you are still running points, you could check that the area behind the points cover is dry and teh gasket seal is still doing its job.  If there is water/condensation inside there, it turns to vapor as the bike warms up, then it can deposit on parts that are still cool inside, like the points.  Intermitantly shorts them out and causes misfires.

Or, maybe you have some water/ condensation in the gas.  It will collect in the low points of the tank/carbs and choose it own time as to when it finds the jets; like after it sloshes a bit in the tank.  Or, if it wanders over from the side of the float bowl.  Drain a bit (or all) from the bottom of carb float bowls into a clean shallow pan.  If you find something other than gas then you're on track for a cause.

Check to see if your gas tank vent is clear.  If not, as fuel is used, a partial vacuum can build up and stop flow to the carbs.

Well, there's some ideas...
Cheers,